SES AI (SES) S-1 14 Feb 22 IPO registration Financial data

Cover Page

Cover Page	9 Months Ended
	Sep. 30, 2021
Cover [Abstract]
Document Type	S-1
Amendment Flag	false
Entity Registrant Name	SES AI Corporation
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Central Index Key	0001819142
Entity Ex Transition Period	false

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Sep. 30, 2021	Jan. 11, 2021	Dec. 31, 2020		Dec. 31, 2019
Current assets:
Cash	$ 30,093,000		$ 2,439,000		$ 25,399,000
Short-term investments	150,000,000		12,291,000		0
Prepaid expenses and other current assets	953,000		373,000		486,000
Receivable from related party	1,138,000		0
Total current assets	182,184,000		15,103,000		25,885,000
Property and equipment, net	5,656,000		6,044,000		7,185,000
Intangible assets, net	1,632,000		1,728,000		1,856,000
Restricted cash	475,000		217,000		289,000
Deferred offering costs	2,679,000		0
Other assets	5,108,000		1,497,000		1,211,000
Total Assets	197,734,000		24,589,000		36,426,000
Liabilities, Current [Abstract]
Accounts payable	3,637,000		1,032,000		640,000
Accrued compensation	2,009,000		1,216,000		586,000
Accrued expenses	1,352,000		788,000		1,013,000
Note payable	0		840,000		0
Accrued expenses and other current liabilities	1,352,000		788,000		1,013,000
Total current liabilities	6,998,000		3,876,000		2,239,000
Other liabilities	672,000		788,000		665,000
Total liabilities	7,670,000		4,614,000		2,904,000
Commitments and Contingencies
Shareholders' Deficit:
Ordinary shares	0		0		0
Additional paid-in capital	1,199,000		836,000		682,000
Accumulated other comprehensive income (loss)	181,000		133,000		(55,000)
Accumulated deficit	(81,257,000)		(63,038,000)		(49,149,000)
Total shareholders' deficit	(79,877,000)		(62,069,000)		(48,522,000)
Total Liabilities, Class A Ordinary Shares Subject to Possible Redemption and Shareholders' Deficit	197,734,000		24,589,000		36,426,000
Previously Reported [Member]
Liabilities, Current [Abstract]
Other liabilities			738,000
Ivanhoe Capital Acquisition Corp [Member]
Current assets:
Cash	254,887	$ 2,156,253	161,271
Prepaid expenses	761,404	26,800
Total current assets	1,016,291	2,183,053	161,271
Investments held in Trust Account	276,052,152	276,000,000
Deferred offering costs associated with Initial Public Offering			413,039
Total Assets	277,068,443	278,183,053	574,310
Liabilities, Current [Abstract]
Accounts payable	42,862	226,057	13,785
Due to related party	10,532
Accrued expenses	198,011	135,000	68,346
Note payable - related party		500,000	500,000
Total current liabilities	251,405	861,057	582,131
Accrued liabilities	4,483,777
Convertible note - related party	1,064,140
Deferred underwriting commissions	9,660,000	9,660,000
Derivative warrant liabilities	20,759,730	22,148,000
Total liabilities	36,219,052	32,669,057	582,131
Commitments and Contingencies
Shareholders' Deficit:
Preference shares, $0.0001 par value; 1,000,000 shares authorized; none issued and outstanding	0	0	690	[1],[2]
Additional paid-in capital		0	24,310
Accumulated deficit	(35,151,299)	(30,486,694)	(32,821)
Total shareholders' deficit	(35,150,609)	(30,486,004)	(7,821)
Total Liabilities, Class A Ordinary Shares Subject to Possible Redemption and Shareholders' Deficit	277,068,443	278,183,053	574,310
Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member]
Shareholders' Deficit:
Ordinary shares	0	0
Class A Common Stock Subject to Redemption | Ivanhoe Capital Acquisition Corp [Member]
Liabilities, Current [Abstract]
Class A ordinary shares subject to possible redemption, $0.0001 par value; 27,600,000 and -0- shares issued and outstanding at $10.00 per share as of September 30, 2021 and December 31, 2020, respectively	276,000,000	276,000,000
Common Class B [Member] | Ivanhoe Capital Acquisition Corp [Member]
Shareholders' Deficit:
Ordinary shares	690	$ 690	690
Redeemable Convertible Preferred Stock [Member]
Liabilities, Current [Abstract]
Class A ordinary shares subject to possible redemption, $0.0001 par value; 27,600,000 and -0- shares issued and outstanding at $10.00 per share as of September 30, 2021 and December 31, 2020, respectively	$ 269,941,000		$ 82,044,000		$ 82,044,000
[1]	Shares and the associated amounts have been retroactively restated to reflect: (i) the surrender of 2,875,000 Class B ordinary shares to the Company for cancellation for no consideration on December 16, 2020; and (ii) the share capitalization of 1,150,000 shares on January 6, 2021, resulting in an aggregate of 6,900,000 Class B ordinary shares outstanding (see Note 6).
[2]	This number excludes an aggregate of up to 900,000 Class B ordinary shares subject to forfeiture if the over-allotment option was not exercised in full or in part by the underwriter. On January 11, 2021, the underwriter exercised its over-allotment option, in full; thus these shares are no longer subject to forfeiture (see Note 6).

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Preferred stock, par value, (per share)	$ 0.000001	$ 0.000001
Preferred stock, shares authorized	36,064,095	29,496,153
Common Stock, Par or Stated Value Per Share	$ 0.000001	$ 0.000001	$ 0.000001
Common stock, shares authorized	45,000,000	45,000,000	39,000,000
Common stock, shares issued	10,265,613	10,245,074	10,245,074
Common stock, shares outstanding	10,265,613	10,245,074	10,245,074
Temporary equity, Shares authorized	36,064,095	29,496,153	29,496,153
Temporary Equity, Shares Outstanding	36,064,095	29,496,153	29,496,153
Temporary Equity, Liquidation Preference	$ 271,148,000	$ 82,643,000	$ 82,643,000
Ivanhoe Capital Acquisition Corp [Member]
Preferred stock, par value, (per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Shares Issued, Price Per Share	$ 10	$ 10
Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member]
Common Stock, Par or Stated Value Per Share	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	27,600,000	0
Common stock, shares outstanding	27,600,000	0
Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member] | Previously Reported [Member]
Common stock, shares authorized		2,000,000,000
Class A Common Stock Subject to Redemption | Ivanhoe Capital Acquisition Corp [Member]
Temporary equity, par value, (per share)	$ 0.0001	$ 0.0001
Temporary Equity, Shares Outstanding	27,600,000	0
Temporary equity, shares issued	27,600,000	0
Shares Issued, Price Per Share	$ 10	$ 10
Common Class B [Member] | Ivanhoe Capital Acquisition Corp [Member]
Common Stock, Par or Stated Value Per Share	$ 0.0001	$ 0.0001
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	6,900,000	6,900,000
Common stock, shares outstanding	6,900,000	6,900,000
Number Of Shares Subject To Forfeiture		900,000
Redeemable Convertible Preferred Stock [Member]
Temporary equity, par value, (per share)	$ 0.000001	$ 0.000001	$ 0.000001
Temporary equity, Shares authorized	36,064,095	29,496,153	29,496,153
Temporary Equity, Shares Outstanding	36,064,095	29,496,153	29,496,153
Temporary equity, shares issued	36,064,095	29,496,153	29,496,153
Temporary Equity, Liquidation Preference	$ 271,148,000	$ 82,643,000	$ 82,643,000

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)		3 Months Ended			6 Months Ended	9 Months Ended		12 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
General and administrative expenses		$ 4,374,000		$ 1,046,000		$ 8,879,000	$ 2,828,000	$ 4,460,000	$ 4,776,000
Research and development		3,684,000		2,219,000		10,175,000	7,254,000	9,443,000	10,514,000
Total operating expenses		8,058,000		3,265,000		19,054,000	10,082,000	13,903,000	15,290,000
Loss from operations		(8,058,000)		(3,265,000)		(19,054,000)	(10,082,000)	(13,903,000)	(15,290,000)
Nonoperating Income (Expense) [Abstract]
Interest income		160,000		0		163,000	71,000	76,000	684,000
Other (expense) income, net		(94,000)		(47,000)		694,000	(32,000)	(55,000)	12,000
Total other income, net		66,000		(47,000)		857,000	39,000	21,000	696,000
Loss before income taxes		(7,992,000)		(3,312,000)		(18,197,000)	(10,043,000)	(13,882,000)	(14,594,000)
Provision for income taxes		(3,000)		0		(22,000)	0	(7,000)	(108,000)
Net income (loss)		(7,995,000)		(3,312,000)		(18,219,000)	(10,043,000)	(13,889,000)	(14,702,000)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Foreign currency translation adjustment		(23,000)		121,000		48,000	61,000	188,000	(62,000)
Total comprehensive loss		$ (8,018,000)		$ (3,191,000)		$ (18,171,000)	$ (9,982,000)	$ (13,701,000)	$ (14,764,000)
Net loss per share, basic and diluted		$ (0.78)		$ (0.32)		$ (1.78)	$ (0.98)	$ (1.36)	$ (1.44)
Weighted-average shares outstanding, basic and diluted		10,258,463		10,245,074		10,249,586	10,245,074	10,245,074	10,223,375
Ivanhoe Capital Acquisition Corp [Member]
General and administrative expenses		$ 2,468,694	$ 20,233		$ 32,821	$ 5,919,125
General and administrative expenses - related party		30,000				90,000
Total operating expenses		(2,498,694)	(20,233)			(6,009,125)
Nonoperating Income (Expense) [Abstract]
Income from investments held in Trust Account		4,168				52,152
Change in fair value of derivative warrant liabilities		5,856,830				1,388,270
Change in fair value of convertible note - related party		11,814				(119,446)
Offering costs - derivative warrant liabilities						(855,043)
Interest income						52,152
Net income (loss)		$ 3,374,118	$ (20,233)		$ (32,821)	$ (5,543,192)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Net loss per share, basic and diluted					$ (0.01)
Weighted-average shares outstanding, basic and diluted	[1],[2]				6,000,000
Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Net loss per share, basic and diluted		$ 0.10				$ (0.17)
Weighted-average shares outstanding, basic and diluted		27,600,000				26,589,011
Common Class B [Member] | Ivanhoe Capital Acquisition Corp [Member]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Net loss per share, basic and diluted		$ 0.10	$ 0			$ (0.17)
Weighted-average shares outstanding, basic and diluted		6,900,000	6,000,000			6,867,033
[1]	Shares and the associated amounts have been retroactively restated to reflect: (i) the surrender of 2,875,000 Class B ordinary shares to the Company for cancellation for no consideration on December 16, 2020; and (ii) the share capitalization of 1,150,000 shares on January 6, 2021, resulting in an aggregate of 6,900,000 Class B ordinary shares outstanding (see Note 6).
[2]	This number excludes an aggregate of up to 900,000 Class B ordinary shares subject to forfeiture if the over-allotment option was not exercised in full or in part by the underwriter. On January 11, 2021, the underwriter exercised its over-allotment option, in full; thus these shares are no longer subject to forfeiture (see Note 6).

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (parenthetical) - shares	Jan. 11, 2021	Jan. 06, 2021	Dec. 16, 2020	Dec. 31, 2020
Aggregate Of Sponsor Shares Surrendered			2,875,000
Common Stock Dividends, Shares		1,150,000
Ivanhoe Capital Acquisition Corp [Member]
Aggregate Of Sponsor Shares Surrendered	900,000
Common Class B [Member] | Ivanhoe Capital Acquisition Corp [Member]
Number Of Shares Subject To Forfeiture		900,000		900,000
Aggregate Of Sponsor Shares Surrendered			2,875,000
Common Stock Dividends, Shares		1,150,000
Aggregate Number Of Shares Owned		6,900,000

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)		Total	Ivanhoe Capital Acquisition Corp [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]Ivanhoe Capital Acquisition Corp [Member]	Accumulated Deficit	Accumulated DeficitIvanhoe Capital Acquisition Corp [Member]	Accumulated Other Comprehensive Income/(Loss)	Common Class A [Member]Ivanhoe Capital Acquisition Corp [Member]	Common Class A [Member]Common Stock [Member]Ivanhoe Capital Acquisition Corp [Member]	Common Class B [Member]Common Stock [Member]Ivanhoe Capital Acquisition Corp [Member]	Redeemable Convertible Preferred Stock [Member]	Redeemable Convertible Preferred Stock [Member]Series C plus redeemable convertible preferred stock [Member]	Redeemable Convertible Preferred Stock [Member]Series D Plus Redeemable Convertible Preferred Stock [Member]
Balance at the beginning at Dec. 31, 2018		$ (33,898,000)			$ 542,000		$ (34,447,000)		$ 7,000
Balance at the beginning (in shares) at Dec. 31, 2018				10,205,074
Balance at the beginning , Redeemable Convertible at Dec. 31, 2018													$ 80,919,000
Balance at the beginning , Redeemable Convertible, Shares at Dec. 31, 2018													29,263,571
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Series C plus preference shares net of issuance costs of $55														$ 1,125,000
Issuance of Series C plus preference shares net of issuance costs of $55, Shares														232,582
Option exercises		$ 17,000			17,000
Option exercises, Shares		40,000		40,000
Stock-based compensation		$ 123,000			123,000
Foreign currency translation adjustments		(62,000)							(62,000)
Net income (loss)		(14,702,000)					(14,702,000)
Balance at the end at Dec. 31, 2019		$ (48,522,000)			682,000		(49,149,000)		(55,000)
Balance at the end (in shares) at Dec. 31, 2019				10,245,074
Balance at the ending , Redeemable Convertible at Dec. 31, 2019													$ 82,044,000
Balance at the ending , Redeemable Convertible, Shares at Dec. 31, 2019		29,496,153											29,496,153
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		$ 21,000			21,000
Foreign currency translation adjustments		(67,000)							(67,000)
Net income (loss)		(3,690,000)					(3,690,000)
Balance at the end at Mar. 31, 2020		(52,258,000)			703,000		(52,839,000)		(122,000)
Balance at the end (in shares) at Mar. 31, 2020				10,245,074
Balance at the ending , Redeemable Convertible at Mar. 31, 2020													$ 82,044,000
Balance at the ending , Redeemable Convertible, Shares at Mar. 31, 2020													29,496,153
Balance at the beginning at Dec. 31, 2019		$ (48,522,000)			682,000		(49,149,000)		(55,000)
Balance at the beginning (in shares) at Dec. 31, 2019				10,245,074
Balance at the beginning , Redeemable Convertible at Dec. 31, 2019													$ 82,044,000
Balance at the beginning , Redeemable Convertible, Shares at Dec. 31, 2019		29,496,153											29,496,153
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Option exercises, Shares		0
Foreign currency translation adjustments		$ 61,000
Net income (loss)		(10,043,000)
Balance at the end at Sep. 30, 2020		(58,409,000)	$ 4,767		777,000	$ 24,310	(59,192,000)	$ (20,233)	6,000		$ 0	$ 690
Balance at the end (in shares) at Sep. 30, 2020				10,245,074							0	6,900,000
Balance at the ending , Redeemable Convertible at Sep. 30, 2020													$ 82,044,000
Balance at the ending , Redeemable Convertible, Shares at Sep. 30, 2020													29,496,153
Balance at the beginning at Dec. 31, 2019		$ (48,522,000)			682,000		(49,149,000)		(55,000)
Balance at the beginning (in shares) at Dec. 31, 2019				10,245,074
Balance at the beginning , Redeemable Convertible at Dec. 31, 2019													$ 82,044,000
Balance at the beginning , Redeemable Convertible, Shares at Dec. 31, 2019		29,496,153											29,496,153
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Option exercises, Shares		0
Stock-based compensation		$ 154,000			154,000
Foreign currency translation adjustments		188,000							188,000
Net income (loss)		(13,889,000)					(13,889,000)
Balance at the end at Dec. 31, 2020		$ (62,069,000)	(7,821)		836,000	24,310	(63,038,000)	(32,821)	133,000		$ 0	$ 690
Balance at the end (in shares) at Dec. 31, 2020				10,245,074							0	6,900,000
Balance at the ending , Redeemable Convertible at Dec. 31, 2020													$ 82,044,000
Balance at the ending , Redeemable Convertible, Shares at Dec. 31, 2020		29,496,153											29,496,153
Balance at the beginning at Mar. 31, 2020		$ (52,258,000)			703,000		(52,839,000)		(122,000)
Balance at the beginning (in shares) at Mar. 31, 2020				10,245,074
Balance at the beginning , Redeemable Convertible at Mar. 31, 2020													$ 82,044,000
Balance at the beginning , Redeemable Convertible, Shares at Mar. 31, 2020													29,496,153
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		93,000			93,000
Foreign currency translation adjustments		7,000							7,000
Net income (loss)		(3,041,000)					(3,041,000)
Balance at the end at Jun. 30, 2020		(55,199,000)			796,000		(55,880,000)		(115,000)
Balance at the end (in shares) at Jun. 30, 2020				10,245,074
Balance at the ending , Redeemable Convertible at Jun. 30, 2020													$ 82,044,000
Balance at the ending , Redeemable Convertible, Shares at Jun. 30, 2020													29,496,153
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		(19,000)			(19,000)
Foreign currency translation adjustments		121,000							121,000
Net income (loss)		(3,312,000)					(3,312,000)
Balance at the end at Sep. 30, 2020		(58,409,000)	4,767		777,000	24,310	(59,192,000)	(20,233)	6,000		$ 0	$ 690
Balance at the end (in shares) at Sep. 30, 2020				10,245,074							0	6,900,000
Balance at the ending , Redeemable Convertible at Sep. 30, 2020													$ 82,044,000
Balance at the ending , Redeemable Convertible, Shares at Sep. 30, 2020													29,496,153
Balance at the beginning at Jul. 07, 2020			0			0		0			$ 0	$ 0
Balance at the beginning (in shares) at Jul. 07, 2020											0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class B common stock to Sponsors			25,000			24,310						$ 690
Shares issues												6,900,000
Net income (loss)			(20,233)					(20,233)
Balance at the end at Sep. 30, 2020		(58,409,000)	4,767		777,000	24,310	(59,192,000)	(20,233)	6,000		$ 0	$ 690
Balance at the end (in shares) at Sep. 30, 2020				10,245,074							0	6,900,000
Balance at the ending , Redeemable Convertible at Sep. 30, 2020													$ 82,044,000
Balance at the ending , Redeemable Convertible, Shares at Sep. 30, 2020													29,496,153
Balance at the beginning at Jul. 07, 2020			0			0		0			$ 0	$ 0
Balance at the beginning (in shares) at Jul. 07, 2020											0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class B common stock to Sponsors			25,000
Balance at the end at Jan. 11, 2021			(30,486,004)
Balance at the ending , Redeemable Convertible, Shares at Jan. 11, 2021										27,600,000
Balance at the beginning at Jul. 07, 2020			0			0		0			$ 0	$ 0
Balance at the beginning (in shares) at Jul. 07, 2020											0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class B common stock to Sponsors	[1],[2]		25,000			24,310						$ 690
Shares issues	[1],[2]											6,900,000
Net income (loss)			(32,821)					(32,821)
Balance at the end at Dec. 31, 2020		$ (62,069,000)	(7,821)		836,000	24,310	(63,038,000)	(32,821)	133,000		$ 0	$ 690
Balance at the end (in shares) at Dec. 31, 2020				10,245,074							0	6,900,000
Balance at the ending , Redeemable Convertible at Dec. 31, 2020													$ 82,044,000
Balance at the ending , Redeemable Convertible, Shares at Dec. 31, 2020		29,496,153											29,496,153
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		$ 72,000			72,000
Foreign currency translation adjustments		(14,000)							(14,000)
Accretion of Class A ordinary shares subject to redemption			(29,599,596)			(24,310)		(29,575,286)
Net income (loss)		(3,595,000)	1,528,079				(3,595,000)	1,528,079
Balance at the end at Mar. 31, 2021		(65,606,000)	(28,079,338)		908,000		(66,633,000)	(28,080,028)	119,000		$ 0	$ 690
Balance at the end (in shares) at Mar. 31, 2021				10,245,074							0	6,900,000
Balance at the ending , Redeemable Convertible at Mar. 31, 2021													$ 82,044,000
Balance at the ending , Redeemable Convertible, Shares at Mar. 31, 2021													29,496,153
Balance at the beginning at Dec. 31, 2020		$ (62,069,000)	(7,821)		836,000	24,310	(63,038,000)	(32,821)	133,000		$ 0	$ 690
Balance at the beginning (in shares) at Dec. 31, 2020				10,245,074							0	6,900,000
Balance at the beginning , Redeemable Convertible at Dec. 31, 2020													$ 82,044,000
Balance at the beginning , Redeemable Convertible, Shares at Dec. 31, 2020		29,496,153											29,496,153
Balance at the end at Jun. 30, 2021		$ (72,036,000)	(38,524,727)		1,022,000		(73,262,000)	(38,525,417)	204,000		$ 0	$ 690
Balance at the end (in shares) at Jun. 30, 2021				10,245,074							0	6,900,000
Balance at the ending , Redeemable Convertible at Jun. 30, 2021													$ 269,941,000
Balance at the ending , Redeemable Convertible, Shares at Jun. 30, 2021													36,064,095
Balance at the beginning at Dec. 31, 2020		$ (62,069,000)	(7,821)		836,000	$ 24,310	(63,038,000)	(32,821)	133,000		$ 0	$ 690
Balance at the beginning (in shares) at Dec. 31, 2020				10,245,074							0	6,900,000
Balance at the beginning , Redeemable Convertible at Dec. 31, 2020													$ 82,044,000
Balance at the beginning , Redeemable Convertible, Shares at Dec. 31, 2020		29,496,153											29,496,153
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Option exercises, Shares		20,539
Foreign currency translation adjustments		$ 48,000
Issuance of Class B common stock to Sponsors			1,100,000
Net income (loss)		(18,219,000)	(5,543,192)
Balance at the end at Sep. 30, 2021		$ (79,877,000)	(35,150,609)		1,199,000		(81,257,000)	(35,151,299)	181,000		$ 0	$ 690
Balance at the end (in shares) at Sep. 30, 2021				10,265,613							0	6,900,000
Balance at the ending , Redeemable Convertible at Sep. 30, 2021													$ 269,941,000
Balance at the ending , Redeemable Convertible, Shares at Sep. 30, 2021		36,064,095											36,064,095
Balance at the beginning at Mar. 31, 2021		$ (65,606,000)	(28,079,338)		908,000		(66,633,000)	(28,080,028)	119,000		$ 0	$ 690
Balance at the beginning (in shares) at Mar. 31, 2021				10,245,074							0	6,900,000
Balance at the beginning , Redeemable Convertible at Mar. 31, 2021													$ 82,044,000
Balance at the beginning , Redeemable Convertible, Shares at Mar. 31, 2021													29,496,153
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Series D and Series D plus redeemable convertible preferred stock, net of issuance costs of $608															$ 187,897,000
Issuance of Series D and Series D plus redeemable convertible preferred stock, net of issuance costs of $608, Shares															6,567,942
Stock-based compensation		114,000			114,000
Foreign currency translation adjustments		85,000							85,000
Net income (loss)		(6,629,000)	(10,445,389)				(6,629,000)	(10,445,389)
Balance at the end at Jun. 30, 2021		(72,036,000)	(38,524,727)		1,022,000		(73,262,000)	(38,525,417)	204,000		$ 0	$ 690
Balance at the end (in shares) at Jun. 30, 2021				10,245,074							0	6,900,000
Balance at the ending , Redeemable Convertible at Jun. 30, 2021													$ 269,941,000
Balance at the ending , Redeemable Convertible, Shares at Jun. 30, 2021													36,064,095
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Option exercises		20,000			20,000
Option exercises, Shares				20,539
Stock-based compensation		157,000			157,000
Foreign currency translation adjustments		(23,000)							(23,000)
Net income (loss)		(7,995,000)	3,374,118				(7,995,000)	3,374,118
Balance at the end at Sep. 30, 2021		$ (79,877,000)	$ (35,150,609)		$ 1,199,000		$ (81,257,000)	$ (35,151,299)	$ 181,000		$ 0	$ 690
Balance at the end (in shares) at Sep. 30, 2021				10,265,613							0	6,900,000
Balance at the ending , Redeemable Convertible at Sep. 30, 2021													$ 269,941,000
Balance at the ending , Redeemable Convertible, Shares at Sep. 30, 2021		36,064,095											36,064,095
[1]	Shares and the associated amounts have been retroactively restated to reflect: (i) the surrender of 2,875,000 Class B ordinary shares to the Company for cancellation for no consideration on December 16, 2020; and (ii) the share capitalization of 1,150,000 shares on January 6, 2021, resulting in an aggregate of 6,900,000 Class B ordinary shares outstanding (see Note 6).
[2]	This number excludes an aggregate of up to 900,000 Class B ordinary shares subject to forfeiture if the over-allotment option was not exercised in full or in part by the underwriter. On January 11, 2021, the underwriter exercised its over-allotment option, in full; thus these shares are no longer subject to forfeiture (see Note 6).

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) (Parenthetical) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2019
Series C plus redeemable convertible preferred stock [Member]
Payments of stock issuance costs		$ 55,000
Series D And SeriesD plus Redeemable convertible preferred stock [Member]
Payments of stock issuance costs	$ 608,000

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($)	3 Months Ended	6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Dec. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net loss			$ (18,219,000)	$ (10,043,000)	$ (13,889,000)	$ (14,702,000)
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Income from investments held in Trust Account			(163,000)	(71,000)	(76,000)	(684,000)
Increase (Decrease) in Operating Capital [Abstract]
Note Payable Forgiveness			(840,000)	0
Receivable from related party			(1,138,000)	0
Depreciation and amortization			1,298,000	1,264,000	1,706,000	918,000
Stock-based compensation			343,000	95,000	154,000	123,000
Prepaid expenses and other current assets			(580,000)	(319,000)	(364,000)	(192,000)
Other assets			(488,000)	(89,000)	31,000	45,000
Accounts payable			617,000	(151,000)	608,000	(188,000)
Accrued compensation			793,000	577,000	630,000	59,000
Accrued expenses and other liabilities			410,000	63,000	115,000	(334,000)
Net cash used in operating activities			(17,804,000)	(8,603,000)	(11,009,000)	(14,271,000)
Net Cash Provided by (Used in) Investing Activities [Abstract]
Purchases of property and equipment			(3,964,000)	(588,000)	(982,000)	(2,691,000)
Purchase of short-term investments			(150,810,000)	(12,795,000)	(17,487,000)	0
Maturities of short-term investments			13,101,000	0	5,196,000	0
Purchases of intangible assets					0	(1,918,000)
Net cash used in investing activities			(141,673,000)	(13,383,000)	(13,273,000)	(4,609,000)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from issuance of Series C plus redeemable convertible preferred stock, net of issuance costs of $55					0	1,125,000
Proceeds from notes payable			0	840,000	840,000	0
Proceeds from stock option exercises			20,000	0	0	17,000
Proceeds from issuance of Series D and Series D plus redeemable convertible preferred stock, net of issuance costs			187,897,000	0
Payment of deferred offering costs			(576,000)	0
Net cash provided by financing activities			187,341,000	840,000	840,000	1,142,000
Effect of exchange rates on cash and cash equivalents			48,000	(60,000)	188,000	(62,000)
Net increase (decrease) in cash, cash equivalents and restricted cash			27,912,000	(21,086,000)	(23,254,000)	(17,800,000)
Cash - beginning of the period			2,728,000	25,982,000	25,982,000	43,782,000
Cash - end of the period	$ 4,896,000	$ 2,728,000	30,640,000	4,896,000	2,728,000	25,982,000
Supplemental disclosure of noncash financing activities:
Accounts payable and accrued expenses related to purchases of property and equipment			(118,000)	348,000	145,000	628,000
RecognitionOfAssetRetirementObligationIncludedInPropertyPlantAndEquipmentNet					0	$ 78,000
Deferred offering costs included in accounts payable and accrued expenses and other liabilities			2,103,000	$ 0
Ivanhoe Capital Acquisition Corp [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net loss	(20,233)	(32,821)	(5,543,192)
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Income from investments held in Trust Account			(52,152)
Change in fair value of derivative warrant liabilities			(1,388,270)
Change in fair value of convertible note - related party			119,446
Offering costs - derivative warrant liabilities			855,043
Increase (Decrease) in Operating Capital [Abstract]
Prepaid expenses	20,233		(761,404)
Accounts payable			29,077
Due to related party			10,532
Accrued expenses		6,213	86,799
Accrued liabilities			4,483,777
General And Administrative Expenses Paid By Sponsor		25,000
Net cash used in operating activities		(1,608)	(2,160,344)
Net Cash Provided by (Used in) Investing Activities [Abstract]
Cash deposited in Trust Account		(276,000,000)	(276,000,000)
Net cash used in investing activities			(276,000,000)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Payment of note payable to related party		408,341	(500,000)
Proceeds received from Initial Public Offering, gross			276,000,000
Proceeds received from private placement			7,520,000
Offering costs paid		(245,462)	(5,710,734)
Proceeds from convertible note to related party			944,694
Net cash provided by financing activities		162,879	278,253,960
Net increase (decrease) in cash, cash equivalents and restricted cash		161,271	93,616
Cash - beginning of the period	0	0	161,271
Cash - end of the period		161,271	254,887		$ 161,271
Supplemental disclosure of noncash financing activities:
Prepaid expenses paid by Sponsor in exchange for issuance of Class B ordinary shares	25,000
Deferred offering costs included in accounts payable	148,494	13,785
Offering costs included in accrued expenses	48,531	62,133	42,867
Deferred offering costs paid by Sponsor under promissory note	$ 91,658	$ 91,659
Deferred underwriting commissions			$ 9,660,000

CONDENSED CONSOLIDATED STATEM_6

CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Series C plus redeemable convertible preferred stock [Member]
Payments of Stock Issuance Costs	$ 55

Nature of Business

Nature of Business	6 Months Ended		9 Months Ended	12 Months Ended
	Jan. 11, 2021	Dec. 31, 2020	Sep. 30, 2021	Dec. 31, 2020
Nature of Business			1. Nature of Business Organization SES Holdings Pte. Ltd., and Subsidiaries (together the “Company”) consists of SES Holdings Pte. Ltd. (“SES Holdings” or the “Parent”), and its wholly owned subsidiaries: SolidEnergy Systems, LLC (the “SES LLC”), SolidEnergy Systems (Shanghai) Co., Ltd. (the “SES Shanghai”), SolidEnergy Systems Securities Corporation (the “SES Securities”), Viking Power Systems Pte. Ltd. (the “SES Viking”), and Massachusetts Solid Energy Co., Ltd. (Korea) which was formed on November 3, 3021. The Company is engaged in the research and development of hybrid Lithium-Metal (“Li-Metal”) Li-Metal Li-Metal Principal operations had not yet commenced as of September 30, 2021, and the Company has not derived revenue from its principal business activities.	1. Nature of Business Organization SES Holdings Pte. Ltd., and Subsidiaries (together the “Company”) consists of SES Holdings Pte. Ltd. (“SES Holdings” or the “Parent”), and its wholly owned subsidiaries: SolidEnergy Systems, LLC (the “SES LLC”), SolidEnergy Systems (Shanghai) Co., Ltd. (the “SES Shanghai”), SolidEnergy Systems Securities Corporation (the “ SES Securities”) and Viking Power Systems Pte. Ltd. (the “SES Viking”). SES Holdings Pte. Ltd. is a Singapore private limited company and was formed in November 2018. SolidEnergy Systems, LLC is a Delaware limited liability company formed in November 2018 as a result of the conversion from a corporation to a limited liability company by SolidEnergy Systems Corp, a Delaware corporation formed in April 2012. SolidEnergy (Shanghai) Enterprise Management Co., Ltd. was registered in Shanghai, China in November 2018. SolidEnergy Systems Securities Corporation was incorporated in December 2017 as a Massachusetts Security Corporation. The Company is engaged in the research and development of hybrid Lithium-Metal (“Li-Metal”) Li-Metal Li-Metal Principal operations had not yet commenced as of December 31, 2020, and the Company has not derived revenue from its principal business activities.
Ivanhoe Capital Acquisition Corp [Member]
Nature of Business	NOTE 1. DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS Ivanhoe Capital Acquisition Corp. (the “Company”) is a blank check company incorporated as a Cayman Islands exempted company on July 8, 2020. The Company was incorporated for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses that the Company has not yet identified (“Business Combination”). As of January 11, 2021, the Company had not yet commenced operations. All activity for the period from July 8, 2020 (inception) through January 11, 2021 relates to the Company’s formation and the Initial Public Offering non-operating The Company’s sponsor is Ivanhoe Capital Sponsor LLC, a Cayman Islands limited liability company (“Sponsor”). The registration statement for the Company’s Initial Public Offering was declared effective on January 6, 2021. On January 11, 2021, the Company consummated its Initial Public Offering of 27,600,000 units (the “Units” and, with respect to the Class A ordinary shares included in the Units being offered, the “Public Shares”), including 3,600,000 additional Units to cover over-allotments (the “Over-Allotment Units”), at $10.00 per Unit, generating gross proceeds of $276.0 million, and incurring offering costs of approximately $15.8 million, of which approximately $9.7 million was for deferred underwriting commissions (Note 7). Simultaneously with the closing of the Initial Public Offering, the Company consummated the private placement (“Private Placement”) of 5,013,333 warrants (each, a “Private Placement Warrant” and collectively, the “Private Placement Warrants”), at a price of $1.50 per Private Placement Warrant with the Sponsor, generating gross proceeds of approximately $7.5 million (Note 5). Upon the closing of the Initial Public Offering and the Private Placement, $276.0 million ($10.00 per Unit) of the net proceeds of the Initial Public Offering and certain of the proceeds of the Private Placement were placed in a trust account (“Trust Account”) with Continental Stock Transfer & Trust Company acting as trustee and invested in United States “government securities” within the meaning of Section 2(a)(16) of the Investment Company Act having a maturity of 185 days or less or in money market funds meeting certain conditions under Rule 2a-7 The Company’s management has broad discretion with respect to the specific application of the net proceeds of its Initial Public Offering and the sale of Private Placement Warrants, although substantially all of the net proceeds are intended to be applied generally toward consummating a Business Combination. The Company’s initial Business Combination must be with one or more operating businesses or assets with a fair market value equal to at least 80% of the net assets held in the Trust Account (excluding the amount of any deferred underwriting discount held in Trust) at the time the Company signs a definitive agreement in connection with the initial Business Combination. However, the Company will only complete a Business Combination if the post-transaction company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under the Investment Company Act. The Company will provide its holders of the Public Shares (the “Public Shareholders”) with the opportunity to redeem all or a portion of their Public Shares upon the completion of a Business Combination either (i) in connection with a shareholder meeting called to approve the Business Combination or (ii) by means of a tender offer. The decision as to whether the Company will seek shareholder approval of a Business Combination or conduct a tender offer will be made by the Company, solely in its discretion. The Public Shareholders will be entitled to redeem their Public Shares for a pro rata portion of the amount then in the Trust Account (initially anticipated to be $10.00 per share, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company to pay its tax obligations). The per-share Notwithstanding the foregoing, the Company’s Amended and Restated Memorandum and Articles of Association provided that a Public Shareholder, together with any affiliate of such shareholder or any other person with whom such shareholder is acting in concert or as a “group” (as defined under Section 13 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), will be restricted from redeeming its shares with respect to more than an aggregate of 20% or more of the Class A ordinary shares sold in the Initial Public Offering, without the prior consent of the Company. The Company’s Sponsor, executive officers, directors and director nominees agreed not to propose an amendment to the Company’s Amended and Restated Memorandum and Articles of Association that would affect the substance or timing of the Company’s obligation to provide for the redemption of its Public Shares in connection with a Business Combination or to redeem 100% of its Public Shares if the Company does not complete a Business Combination, unless the Company provides the Public Shareholders with the opportunity to redeem their Class A ordinary shares in conjunction with any such amendment. If the Company is unable to complete a Business Combination within 24 months from the closing of the Initial Public Offering, or January 11, 2023 (the “Combination Period”), the Company will (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but not more than ten business days thereafter, redeem the Public Shares, at a per-share In connection with the redemption of 100% of the Company’s outstanding Public Shares for a portion of the funds held in the Trust Account, each holder will receive a full pro rata portion of the amount then in the Trust Account, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company to pay the Company’s taxes payable (less up to $100,000 of interest to pay dissolution expenses). The Initial Shareholders have agreed to waive their liquidation rights with respect to the Founder Shares if the Company fails to complete a Business Combination within the Combination Period. However, if the Initial Shareholders should acquire Public Shares in or after the Initial Public Offering, they will be entitled to liquidating distributions from the Trust Account with respect to such Public Shares if the Company fails to complete a Business Combination within the Combination Period. The underwriters have agreed to waive their rights to their deferred underwriting commission (see Note 7) held in the Trust Account in the event the Company does not complete a Business Combination within in the Combination Period and, in such event, such amounts will be included with the funds held in the Trust Account that will be available to fund the redemption of the Company’s Public Shares. In the event of such distribution, it is possible that the per share value of the residual assets remaining available for distribution (including Trust Account assets) will be only $10.00 per share initially held in the Trust Account. In order to protect the amounts held in the Trust Account, the Sponsor has agreed that it will be liable to the Company if and to the extent any claims by a third party for services rendered or products sold to the Company, or a prospective target business with which the Company has entered into a written letter of intent, confidentiality or other similar agreement or business combination agreement, reduce the amount of funds in the Trust Account to below the lesser of (i) $10.00 per public share and (ii) the actual amount per public share held in the trust account as of the date of the liquidation of the Trust Account, if less than $10.00 per share due to reductions in the value of the trust assets, less taxes payable, provided that such liability will not apply to any claims by a third party or prospective target business who executed a waiver of any and all rights to the monies held in the Trust Account (whether or not such waiver is enforceable) nor will it apply to any claims under the Company’s indemnity of the underwriters of the Initial Public Offering against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”). In the event that an executed waiver is deemed to be unenforceable against a third party, the Sponsor will not be responsible to the extent of any liability for such third-party claims. The Company will seek to reduce the possibility that the Sponsor will have to indemnify the Trust Account due to claims of creditors by endeavoring to have vendors, service providers (except the Company’s independent registered public accounting firm), prospective target businesses or other entities with which the Company does business, execute agreements with the Company waiving any right, title, interest or claim of any kind in or to monies held in the Trust Account. Liquidity and capital resources As of January 11, 2021, the Company had approximately $2.2 million in its operating bank account, and working capital of approximately $1.3 million. The Company’s liquidity needs to date have been satisfied through a contribution of $25,000 from Sponsor to cover for certain expenses in exchange for the issuance of the Founder Shares, the loan of $500,000 from the Sponsor pursuant to the Note (see Note 6), and the proceeds from the consummation of the Private Placement not held in the Trust Account. The Company repaid the Note in full on January 15, 2021. In addition, in order to finance transaction costs in connection with a Business Combination, the Sponsor or an affiliate of the Sponsor, or certain of the Company’s officers and directors may, but are not obligated to, provide the Company Working Capital Loans (see Note 6). As of January 11, 2021, there were no amounts outstanding under any Working Capital Loan. Based on the foregoing, management believes that the Company will have sufficient working capital and borrowing capacity from the Sponsor or an affiliate of the Sponsor, or certain of the Company’s officers and directors to meet its needs through the earlier of the consummation of a Business Combination or one year from this filing. Over this time period, the Company will be using these funds for paying existing accounts payable, identifying and evaluating prospective initial Business Combination candidates, performing due diligence on prospective target businesses, paying for travel expenditures, selecting the target business to merge with or acquire, and structuring, negotiating and consummating the Business Combination.	NOTE 1. DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS Ivanhoe Capital Acquisition Corp. (the “Company”) is a blank check company incorporated as a Cayman Islands exempted company on July 8, 2020. The Company was incorporated for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses that the Company has not yet identified (“Business Combination”). As of December 31, 2020, the Company had not yet commenced operations. All activity for the period from July 8, 2020 (inception) through December 31, 2020 relates to the Company’s formation and the Initial Public Offering (the “Initial Public Offering”), which is described below. The Company has selected December 31 as its fiscal year end. The Company’s sponsor is Ivanhoe Capital Sponsor LLC, a Cayman Islands limited liability company (“Sponsor”). The registration statement for the Company’s Initial Public Offering was declared effective on January 6, 2021. On January 11, 2021, the Company consummated its Initial Public Offering of 27,600,000 units (the “Units” and, with respect to the Class A ordinary shares included in the Units being offered, the “Public Shares”), including 3,600,000 additional Units to cover over-allotments (the “Over-Allotment Units”), at $10.00 per Unit, generating gross proceeds of $276.0 million, and incurring offering costs of approximately $15.8 million, of which approximately $9.7 million was for deferred underwriting commissions (Note 6). Simultaneously with the closing of the Initial Public Offering, the Company consummated the private placement (“Private Placement”) of 5,013,333 warrants (each, a “Private Placement Warrant” and collectively, the “Private Placement Warrants”), at a price of $1.50 per Private Placement Warrant with the Sponsor, generating gross proceeds of approximately $7.5 million (Note 4). Upon the closing of the Initial Public Offering and the Private Placement, $276.0 million ($10.00 per Unit) of the net proceeds of the Initial Public Offering and certain of the proceeds of the Private Placement were placed in a trust account (“Trust Account”) with Continental Stock Transfer & Trust Company acting as trustee and invested in United States “government securities” within the meaning of Section 2(a)(16) of the Investment Company Act having a maturity of 185 days or less or in money market funds meeting certain conditions under Rule 2a-7 The Company’s management has broad discretion with respect to the specific application of the net proceeds of its Initial Public Offering and the sale of Private Placement Warrants, although substantially all of the net proceeds are intended to be applied generally toward consummating a Business Combination. The Company’s initial Business Combination must be with one or more operating businesses or assets with a fair market value equal to at least 80% of the net assets held in the Trust Account (excluding the amount of any deferred underwriting discount held in Trust) at the time the Company signs a definitive agreement in connection with the initial Business Combination. However, the Company will only complete a Business Combination if the post-transaction company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under the Investment Company Act. The Company will provide its holders of the Public Shares (the “Public Shareholders”) with the opportunity to redeem all or a portion of their Public Shares upon the completion of a Business Combination either (i) in connection with a shareholder meeting called to approve the Business Combination or (ii) by means of a tender offer. The decision as to whether the Company will seek shareholder approval of a Business Combination or conduct a tender offer will be made by the Company, solely in its discretion. The Public Shareholders will be entitled to redeem their Public Shares for a pro rata portion of the amount then in the Trust Account (initially anticipated to be $10.00 per share, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company to pay its tax obligations). The per-share Notwithstanding the foregoing, the Company’s Amended and Restated Memorandum and Articles of Association will provide that a Public Shareholder, together with any affiliate of such shareholder or any other person with whom such shareholder is acting in concert or as a “group” (as defined under Section 13 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), will be restricted from redeeming its shares with respect to more than an aggregate of 20% or more of the Class A ordinary shares sold in the Initial Public Offering, without the prior consent of the Company. The Company’s Sponsor, executive officers, directors and director nominees agreed not to propose an amendment to the Company’s Amended and Restated Memorandum and Articles of Association that would affect the substance or timing of the Company’s obligation to provide for the redemption of its Public Shares in connection with a Business Combination or to redeem 100% of its Public Shares if the Company does not complete a Business Combination, unless the Company provides the Public Shareholders with the opportunity to redeem their Class A ordinary shares in conjunction with any such amendment. If the Company is unable to complete a Business Combination within 24 months from the closing of the Initial Public Offering, or January 11, 2023 (the “Combination Period”), the Company will (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but not more than ten business days thereafter, redeem the Public Shares, at a per-share In connection with the redemption of 100% of the Company’s outstanding Public Shares for a portion of the funds held in the Trust Account, each holder will receive a full pro rata portion of the amount then in the Trust Account, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company to pay the Company’s taxes payable (less up to $100,000 of interest to pay dissolution expenses). The Initial Shareholders have agreed to waive their liquidation rights with respect to the Founder Shares if the Company fails to complete a Business Combination within the Combination Period. However, if the Initial Shareholders should acquire Public Shares in or after the Initial Public Offering, they will be entitled to liquidating distributions from the Trust Account with respect to such Public Shares if the Company fails to complete a Business Combination within the Combination Period. The underwriters have agreed to waive their rights to their deferred underwriting commission (see Note 6) held in the Trust Account in the event the Company does not complete a Business Combination within in the Combination Period and, in such event, such amounts will be included with the funds held in the Trust Account that will be available to fund the redemption of the Company’s Public Shares. In the event of such distribution, it is possible that the per share value of the residual assets remaining available for distribution (including Trust Account assets) will be only $10.00 per share initially held in the Trust Account. In order to protect the amounts held in the Trust Account, the Sponsor has agreed that it will be liable to the Company if and to the extent any claims by a third party for services rendered or products sold to the Company, or a prospective target business with which the Company has entered into a written letter of intent, confidentiality or other similar agreement or business combination agreement, reduce the amount of funds in the Trust Account to below the lesser of (i) $10.00 per public share and (ii) the actual amount per public share held in the trust account as of the date of the liquidation of the Trust Account, if less than $10.00 per share due to reductions in the value of the trust assets, less taxes payable, provided that such liability will not apply to any claims by a third party or prospective target business who executed a waiver of any and all rights to the monies held in the Trust Account (whether or not such waiver is enforceable) nor will it apply to any claims under the Company’s indemnity of the underwriters of the Initial Public Offering against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”). In the event that an executed waiver is deemed to be unenforceable against a third party, the Sponsor will not be responsible to the extent of any liability for such third-party claims. The Company will seek to reduce the possibility that the Sponsor will have to indemnify the Trust Account due to claims of creditors by endeavoring to have vendors, service providers (except the Company’s independent registered public accounting firm), prospective target businesses or other entities with which the Company does business, execute agreements with the Company waiving any right, title, interest or claim of any kind in or to monies held in the Trust Account. Liquidity and capital resources As of December 31, 2021, the Company had approximately $161,000 in its operating bank account, and working capital deficit of approximately $421,000. The Company’s liquidity needs to date have been satisfied through a contribution of $25,000 from Sponsor to cover certain expenses in exchange for the issuance of the Founder Shares, a loan of $500,000 from the Sponsor pursuant to the Note (see Note 5), and the proceeds from the consummation of the Private Placement not held in the Trust Account. The Company repaid the Note in full on January 15, 2021. In addition, in order to finance transaction costs in connection with a Business Combination, the Sponsor or an affiliate of the Sponsor, or certain of the Company’s officers and directors may, but are not obligated to, provide the Company Working Capital Loans (see Note 5). To date, there were no amounts outstanding under any Working Capital Loan. Based on the foregoing, management believes that the Company will have sufficient working capital and borrowing capacity from the Sponsor or an affiliate of the Sponsor, or certain of the Company’s officers and directors to meet its needs through the earlier of the consummation of a Business Combination or one year from this filing. Over this time period, the Company will be using these funds for paying existing accounts payable, identifying and evaluating prospective initial Business Combination candidates, performing due diligence on prospective target businesses, paying for travel expenditures, selecting the target business to merge with or acquire, and structuring, negotiating and consummating the Business Combination.	Note 1 — Description of Organization and Business Operations Ivanhoe Capital Acquisition Corp. (the “Company”) is a blank check company incorporated as a Cayman Islands exempted company on July 8, 2020. The Company was incorporated for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses (“Business Combination”). On June 28, 2021, the Company formed a wholly owned subsidiary, Wormhole Merger Sub Pte. Ltd., a Singapore private company limited by shares (“Amalgamation Sub”). As of September 30, 2021, the Company had not yet commenced operations. All activity for the period from July 8, 2020 (inception) through September 30, 2021 relates to the Company’s formation and the I P O non-operating The Company’s sponsor is Ivanhoe Capital Sponsor LLC, a Cayman Islands limited liability company (“Sponsor”). The registration statement for the Company’s Initial Public Offering was declared effective on January 6, 2021. On January 11, 2021, the Company consummated its Initial Public Offering of 27,600,000 units (the “Units” and, with respect to the Class A ordinary shares included in the Units being offered, the “Public Shares”), including 3,600,000 additional Units to cover over-allotments (the “Over-Allotment Units”), at $10.00 per Unit, generating gross proceeds of $276.0 million, and incurring offering costs of approximately $15.8 million, of which approximately $9.7 million was for deferred underwriting commissions (Note 6). Simultaneously with the closing of the Initial Public Offering, the Company consummated the private placement (“Private Placement”) of 5,013,333 warrants (each, a “Private Placement Warrant” and collectively, the “Private Placement Warrants”), at a price of $1.50 per Private Placement Warrant with the Sponsor, generating gross proceeds of approximately $7.5 million (Note 4). Upon the closing of the Initial Public Offering and the Private Placement, $276.0 million ($10.00 per Unit) of the net proceeds of the Initial Public Offering and certain of the proceeds of the Private Placement were placed in a trust account (“Trust Account”) with Continental Stock Transfer & Trust Company acting as trustee and invested in United States “government securities” within the meaning of Section 2(a)(16) of the Investment Company Act having a maturity of 185 days or less or in money market funds meeting certain conditions under Rule 2a-7 The Company’s management has broad discretion with respect to the specific application of the net proceeds of its Initial Public Offering and the sale of Private Placement Warrants, although substantially all of the net proceeds are intended to be applied generally toward consummating a Business Combination. The Company’s initial Business Combination must be with one or more operating businesses or assets with a fair market value equal to at least 80% of the net assets held in the Trust Account (excluding the amount of any deferred underwriting discount held in Trust) at the time the Company signs a definitive agreement in connection with the initial Business Combination. However, the Company will only complete a Business Combination if the post-transaction company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under the Investment Company Act. The Company will provide its holders of the Public Shares (the “Public Shareholders”) with the opportunity to redeem all or a portion of their Public Shares upon the completion of a Business Combination either (i) in connection with a shareholder meeting called to approve the Business Combination or (ii) by means of a tender offer. The decision as to whether the Company will seek shareholder approval of a Business Combination or conduct a tender offer will be made by the Company, solely in its discretion. The Public Shareholders will be entitled to redeem their Public Shares for a pro rata portion of the amount then in the Trust Account (initially anticipated to be $10.00 per share, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company to pay its tax obligations). The per-share Notwithstanding the foregoing, the Company’s Amended and Restated Memorandum and Articles of Association will provide that a Public Shareholder, together with any affiliate of such shareholder or any other person with whom such shareholder is acting in concert or as a “group” (as defined under Section 13 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), will be restricted from redeeming its shares with respect to more than an aggregate of 20% or more of the Class A ordinary shares sold in the Initial Public Offering, without the prior consent of the Company. The Company’s Sponsor, executive officers, directors and director nominees agreed not to propose an amendment to the Company’s Amended and Restated Memorandum and Articles of Association that would affect the substance or timing of the Company’s obligation to provide for the redemption of its Public Shares in connection with a Business Combination or to redeem 100% of its Public Shares if the Company does not complete a Business Combination, unless the Company provides the Public Shareholders with the opportunity to redeem their Class A ordinary shares in conjunction with any such amendment. If the Company is unable to complete a Business Combination within 24 months from the closing of the Initial Public Offering, or January 11, 2023 (the “Combination Period”), the Company will (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but not more than ten business days thereafter, redeem the Public Shares, at a per-share In connection with the redemption of 100% of the Company’s outstanding Public Shares for a portion of the funds held in the Trust Account, each holder will receive a full pro rata portion of the amount then in the Trust Account, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company to pay the Company’s taxes payable (less up to $100,000 of interest to pay dissolution expenses). The Initial Shareholders have agreed to waive their liquidation rights with respect to the Founder Shares if the Company fails to complete a Business Combination within the Combination Period. However, if the Initial Shareholders should acquire Public Shares in or after the Initial Public Offering, they will be entitled to liquidating distributions from the Trust Account with respect to such Public Shares if the Company fails to complete a Business Combination within the Combination Period. The underwriters have agreed to waive their rights to their deferred underwriting commission (see Note 6) held in the Trust Account in the event the Company does not complete a Business Combination within in the Combination Period and, in such event, such amounts will be included with the funds held in the Trust Account that will be available to fund the redemption of the Company’s Public Shares. In the event of such distribution, it is possible that the per share value of the residual assets remaining available for distribution (including Trust Account assets) will be only $10.00 per share initially held in the Trust Account. In order to protect the amounts held in the Trust Account, the Sponsor has agreed that it will be liable to the Company if and to the extent any claims by a third party for services rendered or products sold to the Company, or a prospective target business with which the Company has entered into a written letter of intent, confidentiality or other similar agreement or business combination agreement, reduce the amount of funds in the Trust Account to below the lesser of (i) $10.00 per public share and (ii) the actual amount per public share held in the trust account as of the date of the liquidation of the Trust Account, if less than $10.00 per share due to reductions in the value of the trust assets, less taxes payable, provided that such liability will not apply to any claims by a third party or prospective target business who executed a waiver of any and all rights to the monies held in the Trust Account (whether or not such waiver is enforceable) nor will it apply to any claims under the Company’s indemnity of the underwriters of the Initial Public Offering against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”). In the event that an executed waiver is deemed to be unenforceable against a third party, the Sponsor will not be responsible to the extent of any liability for such third-party claims. The Company will seek to reduce the possibility that the Sponsor will have to indemnify the Trust Account due to claims of creditors by endeavoring to have vendors, service providers (except the Company’s independent registered public accounting firm), prospective target businesses or other entities with which the Company does business, execute agreements with the Company waiving any right, title, interest or claim of any kind in or to monies held in the Trust Account. Proposed Business Combination On July 12, 2021, the Company entered into a Business Combination Agreement (as the same may be amended, supplemented or otherwise modified from time to time, the “Agreement”) with Amalgamation Sub and SES. The Agreement and the transactions contemplated thereby (collectively, the “Proposed Business Combination”) were unanimously approved by the boards of directors of each of the Company, Amalgamation Sub and SES. Pursuant to the Agreement, and upon the terms and subject to the conditions set forth therein, and in accordance with the Companies Act, Chapter 50 of Singapore and other applicable law, Amalgamation Sub and SES will amalgamate (the “Amalgamation”), with SES surviving the Amalgamation as the amalgamated company (SES, in its capacity as the company surviving the Amalgamation, the “Amalgamated Company”). Prior to consummation of the Proposed Business Combination, the Company will migrate out of the Cayman Islands and domesticate as a Delaware corporation (the “Domestication”) and be renamed “SES AI Corporation” (the Company, following the Domestication, “New SES”). As a result of the Domestication, (i) each Class A ordinary share, par value $0.0001 per share, of the Company (the “Class A ordinary shares”), issued and outstanding immediately prior to the Domestication will convert into one share of Class A common stock, par value $0.0001 per share, of New SES (the “Class A common stock”); (ii) each Class B ordinary share, par value $0.0001 per share, of the Company (the “Class B ordinary shares”), issued and outstanding immediately prior to the Domestication will convert into one share of Class B common stock, par value $0.0001 per share, of New SES (the “Class B common stock”); (iii) each Company’s warrant to purchase Class A ordinary shares issued and outstanding immediately prior to the Domestication will convert into one warrant to purchase shares of Class A common stock and (iv) each Company’s unit issued and outstanding immediately prior to the Domestication will convert into one unit of New SES (such units to be split into their component parts of one share of Class A common stock and one The total consideration to be paid to the shareholders of SES equals $2,810,000,000 and will be payable in shares of Class A common stock (valued at $10.00 per share). At the effective time of the Amalgamation (the “Effective Time”), each ordinary share and each preference share of SES issued and outstanding immediately prior to the Effective Time (collectively, the “SES Shares”) (other than SES Shares held in SES’s treasury (collectively, the “Excluded Shares”), the SES Restricted Shares (as defined below) and the SES Shares held by Qichao Hu and certain entities affiliated with Mr. Hu (collectively, the “SES Founder Group”)) will be cancelled and automatically represent the right to receive a number of fully paid and nonassessable shares of Class A common stock equal to the Exchange Ratio (as defined below), plus cash in lieu of fractional shares. Additionally, each SES Share held by the SES Founder Group issued and outstanding immediately prior to the Effective Time will be cancelled and automatically represent the right to receive a number of fully paid and nonassessable shares of Class B common stock equal to the Exchange Ratio, plus cash in lieu of fractional shares. The shares of Class B common stock will have the same economic rights as the shares of Class A common stock, but following the Effective Time, each share of Class B common stock will be entitled to 10 votes, and each share of Class A common stock will be entitled to 1 vote, in each case, on each matter submitted for a vote of the New SES stockholders. For purposes of the Agreement, “Exchange Ratio” means the quotient obtained by dividing 281,000,000 by (a) the aggregate number of SES Shares that are issued and outstanding immediately prior to the Effective Time and that are issuable upon the exercise of all vested SES Options (as defined below) and SES Restricted Shares issued and outstanding as of immediately prior to the Effective Time minus (b) the Excluded Shares. In addition to the consideration described above, the SES shareholders and option holders will be entitled to receive 30,000,000 shares of Class A common stock (valued at $10.00 per share) (the “Earn-Out Earn-Out Earn-Out In connection with the Amalgamation, each SES restricted share (the “SES Restricted Shares”) that is issued and outstanding immediately prior to the Effective Time will be assumed by New SES and converted into a number of shares of Class A common stock equal to the product (rounded to the nearest whole number of shares) of (A) the total number of SES ordinary shares subject to such SES Restricted Share immediately prior to the Effective Time multiplied by (B) the Exchange Ratio. In addition, each SES option (the “SES Options”) that is outstanding and unexercised immediately prior to the Effective Time (whether vested or unvested) will be assumed by New SES and converted into an option to acquire Class A common stock at an adjusted exercise price per share, with the number of shares of Class A common stock subject to each option determined by multiplying the number of SES Shares subject to the corresponding SES Option by the Exchange Ratio and rounding the resulting number down to the nearest whole number of shares of Class A common stock. On September 20, 2021, the Company, SES and Amalgamation Sub entered into Amendment No. 1 to the Original Business Combination Agreement (the “ BCA Amendment pre-Closing Earn-Out Earn-Out Earn-Out Founder Group Earn-Out PIPE Financing Concurrently with the execution of the Agreement, the Company entered into subscription agreements (the “Subscription Agreements”) with certain investors (the “PIPE Investors”), pursuant to which the PIPE Investors agreed to subscribe for and purchase, and the Company agreed to issue and sell to such PIPE Investors, immediately prior to Closing, an aggregate of 20,000,000 shares of Class A common stock for a purchase price of $10.00 per share, for aggregate gross proceeds of $200,000,000. On October 22, 2021, the Company entered into an additional subscription agreement (the “New Subscription Agreement”), dated as of October 22, 2021, in connection with its proposed PIPE financing related to its Proposed Business Combination with SES. The New Subscription Agreement is with a strategic investor and is in substantially the same form as the Initial Subscription Agreements. Pursuant to the New Subscription Agreement, the Company agreed to issue and sell, in the PIPE Financing, an aggregate of an additional 7.5 million shares of New SES Class A common stock, at a purchase price of $10.00 per share, for an aggregate purchase price of $75 million, bringing the aggregate amount of commitments from under the initial Subscription Agreements and the New Subscription Agreement (together, the “Subscription Agreements”) to $ million. The additional commitments help ensure that the Company will satisfy the closing condition in the Agreement that the Company have at least $ million of available cash from its trust account and proceeds from the PIPE Financing at the Closing. Risks and Uncertainties Management continues to evaluate the impact of the COVID-19 Liquidity and capital resources As of September 30, 2021, the Company had approximately $255,000 in its operating bank account and working capital of approximately $765,000. The Company’s liquidity needs to date have been satisfied through a contribution of $25,000 from Sponsor to cover certain expenses in exchange for the issuance of the Founder Shares, a loan of $500,000 from the Sponsor pursuant to the Note (see Note 5), and the proceeds from the consummation of the Private Placement not held in the Trust Account. The Company repaid the Note in full on January 15, 2021. In addition, in order to finance transaction costs in connection with a Business Combination, the Sponsor or an affiliate of the Sponsor, or certain of the Company’s officers and directors may, but are not obligated to, provide the Company Working Capital Loans (as defined in Note 5). On April 9, 2021, the Company issued a Convertible Note (as defined in Note 5) to the Company’s Chief Executive Officer, pursuant to which the Company may borrow up to $1,500,000 for ongoing expenses reasonably related to the business of the Company and the consummation of the Business Combination. The Convertible Note does not bear any interest. All unpaid principal under the Convertible Note will be due and payable in full on the earlier of (i) January 11, 2023 and (ii) the effective date of the Business Combination (such earlier date, the “Maturity Date”). As of September 30, 2021, $945,000 was drawn on the convertible note — related party, presented at its fair value of approximately $1.1 million on the accompanying unaudited condensed consolidated balance sheets. There were no amounts outstanding under the Convertible Note as of December 31, 2020. Based on the foregoing, management believes that the Company will have sufficient working capital and borrowing capacity from the Sponsor or an affiliate of the Sponsor, or certain of the Company’s officers and directors to meet its needs through the earlier of the consummation of a Business Combination or one year from this filing. Over this time period, the Company will be using these funds for paying existing accounts payable, identifying and evaluating prospective initial Business Combination candidates, performing due diligence on prospective target businesses, paying for travel expenditures, selecting the target business to merge with or acquire, and structuring, negotiating and consummating the Business Combination.

Restatement Of Previously Filed

Restatement Of Previously Filed Balance Sheet	6 Months Ended
	Jan. 11, 2021
Ivanhoe Capital Acquisition Corp [Member]
Restatement Of Previously Filed Balance Sheet	NOTE 2. RESTATEMENT OF PREVIOUSLY FILED BALANCE SHEET The Company concluded it should restate its previously issued balance sheet to classify all Class A ordinary shares subject to redemption in temporary equity and to classify its outstanding warrants as liabilities. In accordance with ASC 480-10-S99, Additionally, the Company reevaluated the accounting treatment of (i) the 9,200,000 redeemable warrants (the “Public Warrants”) that were included in the units issued by the Company in its Initial Public Offering and (ii) the 5,013,333 Private Placement Warrants that were issued to the Company’s sponsor in a private placement that closed concurrently with the closing of the Initial Public Offering (together with the Public Warrants, the “Warrants”). The Company previously classified the Warrants in shareholders’ equity. In further consideration of the guidance in FASB ASC Topic 815, “Derivatives and Hedging” (“ASC 815”), the Company concluded that a provision in the warrant agreement related to certain tender or exchange offers precludes the Warrants from being accounted for as components of equity. As the Warrants meet the definition of a derivative as contemplated in ASC 815, the Warrants should be recorded as derivative liabilities on the balance sheet and measured at fair value at inception (on the date of the Initial Public Offering) and at each subsequent reporting date, with changes in fair value recognized in income and losses. In accordance with FASB ASC Topic 340, “Other Assets and Deferred Costs,” as a result of the classification of the Warrants as derivative liabilities, the Company expensed a portion of the offering costs originally recorded as a reduction in equity. The portion of offering costs that was expensed was determined based on the relative fair value of the Public Warrants and Class A ordinary shares included in the Units. In accordance with SEC Staff Accounting Bulletin No. 99, “Materiality,” and SEC Staff Accounting Bulletin No. 108, “Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements,” the Company evaluated the corrections and has determined that the related impact was material to the previously filed balance sheet that contained the error, reported in the Company’s Form 8-K “Post-IPO Post-IPO Form 8-K/A. Post-IPO The following tables summarize the effect of the revision on each financial statement line item as of the date indicated: As of January 11, 2021 8-K Adjustment As Restated Total assets $ 278,183,053 $ — $ 278,183,053 Total current liabilities $ 861,057 $ — $ 861,057 Deferred underwriting commissions 9,660,000 — 9,660,000 Derivative warrant liabilities — 22,148,000 22,148,000 Total liabilities $ 10,521,057 $ 22,148,000 $ 32,669,057 Class A ordinary shares subject to possible redemption 262,661,990 13,338,010 276,000,000 Preference shares — — — Class A ordinary shares 133 (133 ) — Class B ordinary shares 690 — 690 Additional paid-in 5,040,999 (5,040,999 ) — Accumulated deficit (41,816 ) (30,444,878 ) (30,486,694 ) Total shareholders’ equity (deficit) $ 5,000,006 $ (35,486,010 ) $ (30,486,004 ) Total liabilities, Class A ordinary shares subject to possible redemption and shareholders’ equity (deficit) $ 278,183,053 $ — $ 278,183,053

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended		9 Months Ended	12 Months Ended
	Jan. 11, 2021	Dec. 31, 2020	Sep. 30, 2021	Dec. 31, 2020
Basis of Presentation and Summary of Significant Accounting Policies			2. Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation The accompanying condensed consolidated financial statements include the accounts of the Company and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) as determined by the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) and pursuant to the regulations of the U.S. Securities and Exchange Commission (“SEC”). Management believes that all adjustments necessary for the fair presentation of results, consisting of normally recurring items, have been included in the unaudited condensed consolidated financial statements for the interim periods presented. All material intercompany balances and transactions have been eliminated in consolidation. During the nine months ended September 30, 2021, there were no significant changes to the Company’s significant accounting policies as described in the Company’s audited consolidated financial statements as of and for the year ended December 31, 2020, except as described below: Deferred offering costs Deferred offering costs consist of legal, accounting, and other costs incurred through the balance sheet date that are directly related to the Company becoming a publicly traded company are capitalized. The deferred offering costs will be charged to stockholders’ equity upon the completion of the proposed transaction. In the event the offering is terminated, these deferred offering costs, as well as additional expenses to be incurred, will be expensed. Impact of Novel Coronavirus (“COVID-19”) On March 11, 2020, the World Health Organization declared the novel coronavirus (“COVID-19”) changing conditions in the respective jurisdictions, and this will continue to evolve based on the recent availability and distribution of developed vaccines, as well as public perceptions of the vaccines. The global spread of COVID-19 COVID-19 COVID-19 COVID-19 COVID-19 Governments in affected regions have implemented, and may continue to implement safety precautions, which include quarantines, travel bans and restrictions, shelter-in-place stay-at-home start-up Due to the COVID-19 non-essential in-person It is difficult to predict what the lasting impact of the pandemic will be, and what the impact might be if the Company or any of the third parties with whom it engages were to experience additional shutdowns or other prolonged business disruptions. The Company’s ability to conduct its business in the manner and on the timelines presently planned could have a material adverse impact on the Company’s business, results of operations, and financial condition. In addition, depending on the duration and impact of the recurrence or resurgence of COVID-19 COVID-19 COVID-19 COVID-19 COVID-19 COVID-19 Liquidity Historically, the Company’s principal sources of liquidity have been the proceeds from series of financing transactions with investors that have provided the Company with the necessary cash and cash equivalents to support its research and development activities. Through September 30, 2021, the Company had raised approximately $269.9 million of funding through the sales of its redeemable convertible preferred stock. See Note 7 for further information. Since inception, the Company has not achieved profitable operations or positive cash flows from operations, and it expects to incur losses in future periods. As of September 30, 2021, the Company had total cash, cash equivalents, restricted cash and short-term investments of $180.6 million and an accumulated deficit of $81.3 million. The Company’s ability to fund its ongoing efforts is dependent on the ability to continue to raise the necessary capital through future financing and capital transactions, as well as the success of the Company’s development and commercialization efforts and, ultimately, upon the market acceptance of the Company’s products. These condensed consolidated financial statements have been prepared on a going concern basis. Management believes that the Company’s current cash and cash equivalents and short-term investments are adequate to meet its needs for the next twelve months from the issuance of these condensed consolidated financial statements. Recent Accounting Pronouncements In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) 2016-02. right-of-use There have been no other newly issued or newly applicable accounting pronouncements that do not require adoption until a future date that have had, or are expected to have, a significant impact on the Company’s condensed consolidated financial statements.	2. Basis of Presentation and Significant Accounting Policies Basis of Presentation The accompanying consolidated financial statements include the accounts of the Company and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) as determined by the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) and pursuant to the regulations of the U.S. Securities and Exchange Commission (“SEC”). All intercompany balances and transactions have been eliminated in consolidation. Impact of Novel Coronavirus (“COVID-19”) On March 11, 2020, the World Health Organization declared the novel coronavirus (“COVID-19”) COVID-19 COVID-19 COVID-19 decrease in vehicle sales in markets around the world. In particular, the COVID-19 COVID-19, Governments in affected regions have implemented, and may continue to implement safety precautions, which include quarantines, travel bans and restrictions, shelter-in-place stay-at-home start-up Due to the COVID-19 non-essential in-person It is difficult to predict what the lasting impact of the pandemic will be, and what the impact might be if the Company or any of the third parties with whom it engages were to experience additional shutdowns or other prolonged business disruptions. The Company’s ability to conduct its business in the manner and on the timelines presently planned could have a material adverse impact on the Company’s business, results of operations, and financial condition. In addition, depending on the duration and impact of the recurrence or resurgence of COVID-19 COVID-19 COVID-19 COVID-19 COVID-19 COVID-19 Liquidity Historically, the Company’s principal sources of liquidity have been the result of a series of financing transactions with investors that have provided the Company with the necessary cash and cash equivalents to support its research and development activities. Through December 31, 2020, the Company has raised approximately $82.0 million of funding through the sales of its redeemable convertible preferred stock. See Note 10 for further information. Since inception, the Company has not achieved profitable operations or positive cash flows from operations, and it expects to incur losses in future periods. As of December 31, 2020, the Company had cash and cash equivalents and short-term investments of $14.7 million and an accumulated deficit of $63.0 million. The Company’s ability to fund its ongoing efforts is dependent on the ability to continue to raise the necessary capital through future financing and capital transactions, as well as the success of the Company’s development and commercialization efforts and, ultimately, upon the market acceptance of the Company’s products. In addition to the funding achieved through the aforementioned financing and capital transactions, in April 2020 the Company applied for and received a loan in the amount of $0.8 million under Paycheck Protection Program (the “PPP”), established pursuant to the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) and administered by the U.S. Small Business Administration (“SBA”) (“PPP Note”). The Company was not obligated to make any payments of principal and interest for a period of 10 months. In February 2021, the Company applied for the loan forgiveness and received the forgiveness confirmation for the PPP Note from SBA. In April 2021, the Company entered into a stock purchase agreement whereby certain investors agreed to purchase million in Series D redeemable convertible preferred stock, par value per share. Upon closing of the financing transaction in April 2021, the investors purchased million in Series D plus redeemable convertible preferred stock, par value per share. Upon closing of the financing transaction in May 2021, the investor purchased A-Sample pre-production These consolidated financial statements have been prepared on a going concern basis. Management believes that the Company’s current cash and cash equivalents and short-term investments, combined with the recent additional financing proceeds, are adequate to meet its needs for the next twelve months from the issuance of these consolidated financial statements. Significant Accounting Policies Use of estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the Company’s consolidated financial statements, as well as the revenues, if any, and expenses incurred during the reporting periods. On an ongoing basis, the Company evaluates judgments and estimates, including those related to the fair value of common stock and other assumptions used to measure stock-based compensation, and valuation of deferred tax assets and uncertain income tax positions. The Company bases its estimates on historical experience and on various other factors that the Company believes are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not apparent from other sources. Changes in estimates are reflected in reported results for the period in which they become known. Actual results could differ materially from those estimates. Cash and cash equivalents Cash and cash equivalents include all highly liquid investments, including money market funds with original maturity periods of three months or less when purchased. Money market funds are reported at fair value based upon quoted market prices. Property and equipment Property and equipment are stated at cost less accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets, as shown below: Estimated Useful Life (in years) Laboratory machinery and equipment 5 - Office and computer equipment 3 - Furniture and fixtures 5 Leasehold improvements Shorter of useful life or lease term The Company will periodically assess the useful lives of the assets to determine whether events or circumstances may indicate that a revision to the useful life is warranted. Maintenance and repairs that do not extend the life or improve the asset are expensed as incurred. Construction-in-process Intangible Assets Intangible assets are stated at cost less accumulated amortization and are comprised of patents. The patents are amortized straight-line over the estimated useful life of 15 Impairment of long-lived assets The Company evaluates long-lived assets for impairment whenever events indicate that a potential impairment may have occurred. If such events arise, the Company will compare the carrying amount of the asset group comprising the long-lived assets to the estimated future undiscounted cash flows expected to be generated by the asset group. If the estimated aggregate undiscounted cash flows are less than the carrying amount of the asset group, an impairment charge is recorded as the amount by which the carrying amount of the asset group exceeds the fair value of the assets, as based on the expected discounted future cash flows attributable to those assets. Long-lived assets to be disposed of are reported at the lower of carrying amount or fair value less costs to sell. There were no impairments of long-lived assets during the years ended December 31, 2020 and 2019. Leases Leases are evaluated and recorded as capital leases if one of the following is true at inception: (a) the present value of minimum lease payments meets or exceeds 90% of the fair value of the asset, (b) the lease term is greater than or equal to 75% of the economic life of the asset, (c) the lease arrangement contains a bargain purchase option, or (d) title to the property transfers to the Company at the end of the lease. The Company records an asset and liability for capital leases at present value of the minimum lease payments based on the incremental borrowing rate. Assets are depreciated over the useful life in accordance with the Company’s depreciation policy while rental payments and interest on the liability are accounted for using the effective interest method. Leases that are not classified as capital leases are accounted for as operating leases. For leases that contain rent abatements or escalating rent payments, the Company recognizes rent expense on a straight-line basis over the lease term, with any lease incentives amortized as a reduction of rent expense over the lease term. Redeemable Convertible Preferred Stock The Company records all shares of redeemable convertible preferred stock at their respective fair values less issuance costs on the dates of issuance. The redeemable convertible preferred stock is recorded outside of Restricted cash Restricted cash are money market funds held in collateral accounts that are restricted to secure letters of credit for corporate lease activity. The letters of credit are required to be maintained throughout the terms of the leases. If the date of availability or disbursement is longer than one year and the balances are maintained under an agreement that legally restricts the use of such funds, restricted cash is not included within cash and cash equivalents and is reported separately on the consolidated balance sheet. If the date of availability or disbursement is less than one-year, Short-term investments The Company considers investments with original maturities greater than three months and remaining maturities less than one year to be short-term investments. The short-term investments consist of corporate bonds and mutual funds which are classified as available-for-sale. Corporate bonds and mutual funds are carried at fair value based upon quoted market prices. Unrealized gains and losses on available-for-sale available-for-sale Concentrations of credit risk Financial instruments that subject the Company to significant concentrations of credit risk consist of cash, cash equivalents, restricted cash and short-term investments. The Company seeks to mitigate its credit risk with respect to such concentrations by holding its deposits with large, reputable financial institutions and investing in high credit rated shorter-term instruments. Fair Value Measurements Fair value is defined as an exchange price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required or permitted to be either recorded or disclosed at fair value, the Company considers the principal or most advantageous market in which it would transact, and it also considers assumptions that market participants would use when pricing the asset or liability. The Company maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value. GAAP establishes a fair value hierarchy based on the level of independent, objective evidence surrounding the inputs used to measure fair value. A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The fair value hierarchy is as follows: Level 1 Observable inputs such as quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. Level 2 Inputs other than the quoted prices in active markets that are observable either directly or indirectly. Level 3 Unobservable inputs in which there are little or no market data and which require the Company to develop its own assumptions. The carrying amounts of cash equivalents and accounts payable approximate their fair value due to the short-term nature of these assets and liabilities. The carrying amount of the note payable approximates fair value due to its short-term maturity. stockholders’ deficit because, in the event of certain liquidation events considered not solely within the Company’s control, such as a change in control event and sale of all or substantially all of the Company’s assets, the redeemable convertible preferred stock will become redeemable at the option of the holders. If it becomes probable that the shares will become redeemable, the Company will re-measure Segment and geographic information Operating segments are defined as components of an entity for which separate financial information is available and that is regularly reviewed by the Chief Operating Decision Maker (“CODM”) in deciding how to allocate resources to an individual segment and in assessing performance. The Company’s CODM is its Chief Executive Officer. The Company has determined that it operates in one operating and reportable segment, as the CODM reviews financial information presented on a consolidated basis for purposes of making operating decisions, allocating resources, and evaluating financial performance. All long-lived assets of the Company are located in the United States, China and Singapore (see Note 15). Research and development costs Research and development costs are expensed as incurred. Research and development costs consist of expenses incurred in performing research and development activities, including compensation and benefits for full-time research and development employees, materials and supplies, payments to consultants, patent related legal costs, facility costs, depreciation, and travel expenses. Payments received by the Company under agreements with partners are being recognized as a reduction to research and development expense in the consolidated statements of operations and comprehensive loss. Stock-based compensation The Company measures compensation expense for all stock options made to employees, directors, and non-employees The Company has only granted stock option awards with service-based vesting conditions. Accordingly, the fair value of options granted is estimated using the Black-Scholes option valuation model, which requires the Company to make assumptions and judgments about the variables used in the calculation, including the fair value of the underlying common stock, the expected term of the stock option (weighted-average period of time that the options granted are expected to be outstanding), the expected volatility of the price of the Company’s common stock, the expected risk-free interest rate and the expected dividend yield of the Company’s common stock. The Company accounts for forfeitures when they occur. Changes in the assumptions can materially affect the fair value and ultimately how much stock-based compensation expense is recognized. These inputs are subjective and generally require significant analysis and judgment to develop. Income taxes Income tax expense has been provided using the asset and liability method. Deferred tax assets and liabilities are determined based on the estimated future tax consequences attributable to differences between the financial statement carrying amounts and tax bases of existing assets and liabilities. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. Deferred tax expense or benefit is the result of changes in the deferred tax asset and liability. The Company provides a valuation allowance against net deferred tax assets if, based upon the available evidence, it is more likely than not that the deferred tax assets are not realized. In evaluating the Company’s ability to recover deferred tax assets, the Company considers all available positive and negative evidence, including historical operating results, ongoing tax planning, and forecasts of future taxable income on a jurisdiction-by-jurisdiction The Company recognizes a tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the Company’s consolidated financial statements from such positions are measured based on the largest benefit that has a greater than 50% likelihood of being realized. The Company recognizes interest and penalties associated with tax matters as part of the income tax provision and includes accrued interest and penalties with the related income tax liability within accrued expenses and other current liabilities on its consolidated balance sheets. Other Comprehensive Loss Other Comprehensive income (loss) includes changes in the balances of items that are reported directly as a separate component of stockholders’ deficit on the consolidated balance sheets. The components of comprehensive loss are net loss and foreign currency translation adjustments. The Company does not provide for income taxes on foreign currency translation adjustments since it does not provide for taxes on the unremitted earnings of its foreign subsidiaries. The changes in accumulated other comprehensive loss are included in the Company’s consolidated statements of operations and comprehensive loss. Net loss per common share Basic and diluted net loss per share is presented in conformity with the two-class two-class Recent Accounting Pronouncements Adopted In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash 2016-18”). 2016-18 2016-18, beginning-of-period end-of-period In June 2018, the FASB issued ASU No. 2018-07, Compensation-Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting 2018-07”), non-employees. 2018-07 amendments amendments are effective for fiscal years beginning after December 15, 2019. The Company adopted this ASU on January 1, 2020. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement 2018-13”), 2018-13 Recent Accounting Pronouncements Not Yet Adopted In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) 2016-02. right-of-use
Ivanhoe Capital Acquisition Corp
Basis of Presentation and Summary of Significant Accounting Policies	NOTE 3. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of presentation The accompanying financial statement is presented in U.S. dollars in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and pursuant to the rules and regulations of the SEC. Emerging growth company The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and it may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies including, but not limited to, not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act of 2002, reduced disclosure obligations regarding executive compensation in its periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and shareholder approval of any golden parachute payments not previously approved. Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that an emerging growth company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging Concentration of credit risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash accounts in a financial institution, which, at times, may exceed the Federal Depository Insurance Coverage limit of $250,000. At January 11, 2021, the Company has not experienced losses on these accounts and management believes the Company is not exposed to significant risks on such accounts. Cash and cash equivalents The Company considers all short-term investments with an original maturity of three months or less when purchased to be cash equivalents. The Company had no cash equivalents as of January 11, 2021. Cash held in Trust Account At January 11, 2021, the Company had $276.0 million in cash held in the Trust Account. Use of estimates The preparation of financial statement in conformity with GAAP requires the Company’s management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statement. Making estimates requires management to exercise significant judgment. It is at least reasonably possible that the estimate of the effect of a condition, situation or set of circumstances that existed at the date of the financial statement, which management considered in formulating its estimate, could change in the near term due to one or more future confirming events. Accordingly, the actual results could differ significantly from those estimates. Fair value of financial instruments The fair value of the Company’s assets and liabilities, which qualify as financial instruments under the FASB ASC 820, “Fair Value Measurements and Disclosures,” approximates the carrying amounts represented in the balance sheet, primarily due to their short-term nature. Fair Value Measurements Fair value is defined as the price that would be received for sale of an asset or paid for transfer of a liability, in an orderly transaction between market participants at the measurement date. GAAP establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). These tiers consist of: • Level 1, defined as observable inputs such as quoted prices (unadjusted) for identical instruments in active markets; • Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable such as quoted prices for similar instruments in active markets or quoted prices for identical or similar instruments in markets that are not active; and • Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions, such as valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable. In some circumstances, the inputs used to measure fair value might be categorized within different levels of the fair value hierarchy. In those instances, the fair value measurement is categorized in its entirety in the fair value hierarchy based on the lowest level input that is significant to the fair value measurement. Derivative warrant liabilities The Company does not use derivative instruments to hedge exposures to cash flow, market, or foreign currency risks. The Company evaluates all of its financial instruments, including issued stock purchase warrants, to determine if such instruments are derivatives or contain features that qualify as embedded derivatives, pursuant to ASC 480 and ASC 815. The classification of derivative instruments, including whether such instruments should be recorded as liabilities or as equity, is re-assessed The Public Warrants and the Private Placement Warrants (as defined in Note 5) are recognized as derivative liabilities in accordance with ASC 815-40. non-current Offering costs associated with the Initial Public Offering Offering costs consisted of legal, accounting, underwriting fees and other costs incurred through the Initial Public Offering that were directly related to the Initial Public Offering. Offering costs are allocated to the separable financial instruments issued in the Initial Public Offering based on a relative fair value basis, compared to total proceeds received. Offering costs associated with warrant liabilities are expensed as incurred and presented as non-operating ordinary shares are charged against their carrying value upon the completion of the Initial Public Offering. Deferred underwriting commissions are classified as non-current Class A ordinary shares subject to possible redemption The Company accounts for its Class A ordinary shares subject to possible redemption in accordance with the guidance in ASC 480. Class A ordinary shares subject to mandatory redemption (if any) are classified as liability instruments and are measured at fair value. Conditionally redeemable Class A ordinary shares (including Class A ordinary shares that feature redemption rights that are either within the control of the holder or subject to redemption upon the occurrence of uncertain events not solely within the Company’s control) are classified as temporary equity. At all other times, Class A ordinary shares are classified as shareholders’ equity. The Company’s Class A ordinary shares feature certain redemption rights that are considered to be outside of the Company’s control and subject to the occurrence of uncertain future events. Accordingly, at January 11, 2021, 27,600,000 Class A ordinary shares subject to possible redemption are presented as temporary equity, outside of the shareholders’ equity section of the Company’s balance sheet. The Company recognizes changes in redemption value immediately as they occur and adjusts the carrying value of the Class A ordinary shares subject to possible redemption to equal the redemption value at the end of each reporting period. This method would view the end of the reporting period as if it were also the redemption date for the security. Effective with the closing of the Initial Public Offering, the Company recognized the accretion from initial book value to redemption amount, which resulted in charges against additional paid-in Income taxes ASC Topic 740 prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more-likely-than-not There is currently no taxation imposed on income by the Government of the Cayman Islands. In accordance with Cayman federal income tax regulations, income taxes are not levied on the Company. Consequently, income taxes are not reflected in the Company’s financial statement. The Company’s management does not expect that the total amount of unrecognized tax benefits will materially change over the next twelve months. Recent Accounting Pronouncements Management does not believe that any recently issued, but not yet effective, accounting pronouncements, if currently adopted, would have a material effect on the Company’s financial statement.	NOTE 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of presentation The accompanying financial statements are presented in U.S. dollars in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and pursuant to the rules and regulations of the SEC. Emerging growth company The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and it may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies including, but not limited to, not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act of 2002, reduced disclosure obligations regarding executive compensation in its periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and shareholder approval of any golden parachute payments not previously approved. Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that an emerging growth company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging Concentration of credit risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of a cash account in a financial institution, which, at times, may exceed the Federal depository insurance coverage limit of $250,000. The Company has not experienced losses on this account and management believes the Company is not exposed to significant risks on the account. Cash and cash equivalents The Company considers all short-term investments with an original maturity of three months or less when purchased to be cash equivalents. The Company had no cash equivalents as of December 31, 2020. Use of estimates The preparation of financial statements in conformity with GAAP requires the Company’s management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. Making estimates requires management to exercise significant judgment. It is at least reasonably possible that the estimate of the effect of a condition, situation or set of circumstances that existed at the date of the financial statements, which management considered in formulating its estimate, could change in the near term due to one or more future confirming events. Accordingly, the actual results could differ significantly from those estimates. Fair value of financial instruments The fair value of the Company’s assets and liabilities, which qualify as financial instruments under FASB ASC Topic 820, “Fair Value Measurements”, approximates the carrying amounts represented in the balance sheet, primarily due to their short-term nature. Offering costs associated with the Initial Public Offering Offering costs consisted of legal, accounting, and other costs incurred that were directly related to the Initial Public Offering and that were charged to shareholders’ equity upon the completion of the Initial Public Offering. Income taxes FASB ASC Topic 740 prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more-likely-than-not There is currently no taxation imposed on income by the Government of the Cayman Islands. In accordance with Cayman federal income tax regulations, income taxes are not levied on the Company. Consequently, income taxes are not reflected in the Company’s financial statements. The Company’s management does not expect that the total amount of unrecognized tax benefits will materially change over the next twelve months. Recent Accounting Pronouncements Management does not believe that any recently issued, but not yet effective, accounting pronouncements, if currently adopted, would have a material effect on the Company’s financial statements.	Note 2 — Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited condensed consolidated financial statements are presented in U.S. dollars in conformity with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q Regulation S-X The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the audited financial statements and notes thereto included in the Annual Report on Form 10-K Restatement of Previously Reported Financial Statements In connection with the preparation of the Company’s unaudited condensed consolidated financial statements for the quarterly period ended September 30, 2021, the Company concluded it should restate its previously issued financial statements to classify all Class A ordinary shares subject to possible redemption in temporary equity. In accordance with the SEC and its staff’s guidance on redeemable equity instruments in ASC 480 10-S99, In connection with the change in presentation for the Class A ordinary shares subject to possible redemption, the Company has restated its earnings per share calculation to allocate income and losses shared pro rata between the two classes of shares. This presentation contemplates a Business Combination as the most likely outcome, in which case, both classes of shares participate pro rata in the income and losses of the Company. In accordance with SEC Staff Accounting Bulletin No. 99, “Materiality,” and SEC Staff Accounting Bulletin No. 108, “Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements,” the Company evaluated the corrections and has determined that the related impact was material to the previously filed financial statements that contained the error reported in the Company’s Form 10-Qs The table below presents the effect of the financial statement adjustments related to the restatement discussed above of the Company’s previously reported balance sheet as of March 31, 2021: As of March 31, 2021 As Previously Adjustment As Restated Total assets $ 277,256,530 $ — $ 277,256,530 Total liabilities $ 29,335,868 $ — $ 29,335,868 Class A ordinary shares subject to possible redemption 242,920,660 33,079,340 276,000,000 Preference shares — — — Class A ordinary shares 331 (331 ) — Class B ordinary shares 690 — 690 Additional paid-in $ 3,503,723 (3,503,723 ) — Retained earnings (accumulated deficit) $ 1,495,258 (29,575,286 ) $ (28,080,028 ) Total shareholders’ equity (deficit) $ 5,000,002 $ (33,079,340 ) $ (28,079,338 ) Total Liabilities, Class A Ordinary Shares Subject to Possible Redemption and Shareholders’ Equity (Deficit) $ 277,256,530 $ — $ 277,256,530 The Company’s statement of shareholders’ equity (deficit) has been restated to reflect the changes to the impacted shareholders’ equity (deficit) accounts described above. The table below presents the effect of the financial statement adjustments related to the restatement discussed above of the Company’s previously reported statement of cash flows for the three months ended March 31, 2021: Supplemental Disclosure of Noncash Financing As Reported Adjustment As Restated Initial $ 240,513,990 $ (240,513,990 ) $ — Change $ (8,038,720 ) $ 8,038,720 $ — The table below presents the effect of the financial statement adjustments related to the restatement discussed above of the Company’s previously reported balance sheet as of June 30, 2021: As of June 30, 2021 As Previously Adjustment As Restated Total assets $ 277,467,799 $ — $ 277,467,799 Total liabilities $ 39,992,526 $ — $ 39,992,526 Class A ordinary shares subject to possible redemption 232,475,270 43,524,730 276,000,000 Preference shares — — — Class A ordinary shares 435 (435 ) — Class B ordinary shares 690 — 690 Additional paid-in $ 13,949,009 (13,949,009 ) — Accumulated deficit $ (8,950,131 ) (29,575,286 ) $ (38,525,417 ) Total shareholders’ equity (deficit) $ 5,000,003 $ (43,524,730 ) $ (38,524,727 ) Total Liabilities, Class A Ordinary Shares Subject to Possible Redemption and Shareholders’ Equity (Deficit) $ 277,467,799 $ — $ 277,467,799 The Company’s statement of shareholders’ equity (deficit) has been restated to reflect the changes to the impacted shareholders’ equity (deficit) accounts described above. The table below presents the effect of the financial statement adjustments related to the restatement discussed above of the Company’s previously reported statement of cash flows for the six months ended June 30, 2021: Supplemental Disclosure of Noncash Financing Activities: As Reported Adjustment As Restated Initial value of Class A ordinary shares subject to possible redemption $ 240,513,990 $ (240,513,990 ) $ — Change in value of Class A ordinary shares subject to possible redemption $ (8,038,720 ) $ 8,038,720 $ — The impact to the reported amounts of weighted average shares outstanding and basic and diluted earnings per share is presented below for the Affected Quarterly Periods: Earnings Per Share for Class A ordinary shares As Reported Adjustment As Restated For the three months ended March 31, 2021 Net income $ 1,528,079 $ — $ 1,528,079 Weighted average shares outstanding 27,600,000 (3,066,667 ) 24,533,333 Basic and diluted earnings per ordinary share $ — $ 0.05 $ 0.05 For three months ended June 30, 2021 Net loss $ (10,445,389 ) $ — $ (10,445,389 ) Weighted average shares outstanding 27,600,000 — 27,600,000 Basic and diluted earnings per ordinary share $ — $ (0.30 ) $ (0.30 ) For the six months ended June 30, 2021 Net loss $ (8,917,310 ) $ — $ (8,917,310 ) Weighted average shares outstanding 27,600,000 (1,524,862 ) 26,075,138 Basic and diluted earnings per ordinary share $ — $ (0.27 ) $ (0.27 ) Earnings Per Share for Class B ordinary shares As Reported Adjustment As Restated For the three months ended March 31, 2021 Net income $ 1,528,079 $ — $ 1,528,079 Weighted average shares outstanding 6,800,000 — 6,800,000 Basic and diluted earnings per ordinary share $ 0.22 $ (0.17 ) $ 0.05 For three months ended June 30, 2021 Net loss $ (10,445,389 ) $ — $ (10,445,389 ) Weighted average shares outstanding 6,900,000 — 6,900,000 Basic and diluted earnings per ordinary share $ (1.51 ) $ 1.21 $ (0.30 ) For the six months ended June 30, 2021 Net loss $ (8,917,310 ) $ — $ (8,917,310 ) Weighted average shares outstanding 6,850,276 — 6,850,276 Basic and diluted earnings per ordinary share $ (1.31 ) $ 1.04 $ (0.27 ) Principles of Consolidation The condensed consolidated financial statements of the Company include its wholly-owned subsidiary, Wormhole Merger Sub Pte. Ltd., which was incorporated in Singapore on June 28, 2021, in connection with the planned business combination. All inter-company accounts and transactions are eliminated in consolidation. Emerging Growth Company The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and it may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies including, but not limited to, not being required to comply with the independent registered public accounting firm attestation requirements of Section 404 of the Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in its periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and shareholder approval of any golden parachute payments not previously approved. Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that an emerging growth company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging This may make comparison of the Company’s unaudited condensed consolidated financial statements with another public company that is neither an emerging growth company nor an emerging growth company that has opted out of using the extended transition period difficult or impossible because of the potential differences in accounting standards used. Use of Estimates The preparation of unaudited condensed consolidated financial statements in conformity with GAAP requires the Company’s management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the unaudited condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Making estimates requires management to exercise significant judgment. It is at least reasonably possible that the estimate of the effect of a condition, situation or set of circumstances that existed at the date of the unaudited condensed consolidated financial statements, which management considered in formulating its estimate, could change in the near term due to one or more future confirming events. One of the more significant accounting estimates included in these unaudited condensed consolidated financial statements is the determination of the fair value of the warrant liabilities. Such estimates may be subject to change as more current information becomes available and accordingly the actual results could differ significantly from those estimates. Cash and Cash Equivalents The Company considers all short-term investments with an original maturity of three months or less when purchased to be cash equivalents. The Company had no cash equivalents as of September 30, 2021 and December 31, 2020. Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash accounts in a financial institution, which, at times, may exceed the Federal Deposit Insurance Corporation coverage limits of $250,000 and any cash held in Trust Account. As of September 30, 2021 and December 31, 2020, the Company had not experienced losses on these accounts and management believes the Company is not exposed to significant risks on such account. Investments Held in Trust Account The Company’s portfolio of investments is comprised of U.S. government securities, within the meaning set forth in Section 2(a)(16) of the Investment Company Act, with a maturity of 185 days or less, or investments in money market funds that invest in U.S. government securities and generally have a readily determinable fair value, or a combination thereof. When the Company’s investments held in the Trust Account are comprised of U.S. government securities, the investments are classified as trading securities. When the Company’s investments held in the Trust Account are comprised Fair Value of Financial Instruments The fair value of the Company’s assets and liabilities, which qualify as financial instruments under the FASB ASC Topic 820, “Fair Value Measurements,” approximates the carrying amounts represented in the condensed balance sheets. The Company has elected the fair value option to account for its Convertible Note with its Sponsor as defined and more fully described in Note 5. As a result of applying the fair value option, the Company records each draw at fair value with a gain or loss recognized at issuance, and subsequent changes in fair value are recorded as change in the fair value of Convertible Note — related party on the condensed statement of operations. The fair value is based on prices or valuation techniques that require inputs that are both unobservable and significant to the overall fair value measurement. These inputs reflect management’s and, if applicable, an independent third-party valuation firm’s own assumption about the assumptions a market participant would use in pricing the asset or liability. Fair Value Measurements Fair value is defined as the price that would be received for sale of an asset or paid for transfer of a liability, in an orderly transaction between market participants at the measurement date. GAAP establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). These tiers consist of: • Level 1, defined as observable inputs such as quoted prices (unadjusted) for identical instruments in active markets; • Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable such as quoted prices for similar instruments in active markets or quoted prices for identical or similar instruments in markets that are not active; and • Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions, such as valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable. In some circumstances, the inputs used to measure fair value might be categorized within different levels of the fair value hierarchy. In those instances, the fair value measurement is categorized in its entirety in the fair value hierarchy based on the lowest level input that is significant to the fair value measurement. Derivative warrant liabilities The Company does not use derivative instruments to hedge exposures to cash flow, market, or foreign currency risks. The Company evaluates all of its financial instruments, including issued stock purchase warrants, to determine if such instruments are derivatives or contain features that qualify as embedded derivatives, pursuant to ASC 480 and ASC Subtopic 815-15 re-assessed The warrants issued in connection with the Initial Public Offering (the “Public Warrants”) and the Private Placement Warrants (as defined in Note 4) (collectively, the “Warrant”) are recognized as derivative liabilities in accordance with ASC 815-40. non-current Offering Costs Associated with the Initial Public Offering Offering costs consisted of legal, accounting, underwriting fees and other costs incurred through the Initial Public Offering that were directly related to the Initial Public Offering. Offering costs are allocated to the separable financial instruments issued in the Initial Public Offering based on a relative fair value basis, compared to total proceeds received. Offering costs associated with warrant liabilities are expensed as incurred and presented as non-operating non-current Class A Ordinary Shares Subject to Possible Redemption The Company accounts for its Class A ordinary shares subject to possible redemption in accordance with the guidance in ASC Topic 480 “Distinguishing Liabilities from Equity.” Class A ordinary shares subject to mandatory redemption (if any) are classified as liability instruments and are measured at fair value. Conditionally redeemable Class A ordinary shares (including Class A ordinary shares that feature redemption rights that are either within the control of the holder or subject to redemption upon the occurrence of uncertain events not solely within the Company’s control) are classified as temporary equity. At all other times, Class A ordinary shares are classified as shareholders’ equity. The Company’s Class A ordinary shares feature certain redemption rights that are considered to be outside of the Company’s control and subject to the occurrence of uncertain future events. Accordingly, as of Initial Public Offering, 27,600,000 Class A ordinary shares subject to possible redemption are presented as temporary equity, outside of the shareholders’ equity (deficit) section of the Company’s unaudited condensed consolidated balance sheets. As of December 31, 2020, there were no Class A ordinary shares subject to possible redemption. Effective with the closing of the Initial Public Offering, the Company recognized the accretion from initial book value to redemption amount, which resulted in charges against additional paid-in Income Taxes The Company complies with the accounting and reporting requirements of FASB ASC Topic 740, “Income Taxes,” which prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more-likely-than-not There is currently no taxation imposed on income by the Government of the Cayman Islands. In accordance with Cayman federal income tax regulations, income taxes are not levied on the Company. Consequently, income taxes are not reflected in the Company’s unaudited condensed consolidated financial statement. The Company’s management does not expect that the total amount of unrecognized tax benefits will materially change over the next twelve months. Net Income (Loss) Per Ordinary Share The Company complies with accounting and disclosure requirements of FASB ASC Topic 260, “Earnings Per Share.” The Company has two classes of ordinary shares, which are referred to as Class A ordinary shares and Class B ordinary shares. Income and losses are shared pro rata between the two classes of ordinary shares. Net income (loss) per ordinary share is calculated by dividing the net income (loss) by the weighted average ordinary shares outstanding for the respective period. The calculation of diluted net income (loss) per ordinary share does not consider the effect of the warrants issued in connection with the Initial Public Offering and the Private Placement to purchase an aggregate of 14,213,280 Class A ordinary share in the calculation of diluted income (loss) per ordinary share, because their exercise is contingent upon future events. As a result, diluted net income (loss) per ordinary share is the same as basic net income (loss) per share ordinary for the three and nine months ended September 30, 2021. Accretion associated with the redeemable Class A ordinary shares is excluded from earnings per ordinary share as the redemption value approximates fair value. The following table reflects presents a reconciliation of the numerator and denominator used to compute basic and diluted net income (loss) per ordinary share for each class of ordinary shares: For the Three Months Ended September 30, 2021 For the Nine Months Ended September 30, 2021 For the Period From July 8, 2020 (Inception) Through September 30, 2020 Class A Class B Class A Class B Class A Class B Basic and diluted net income (loss) per ordinary share: Numerator: Allocation of net income (loss) $ 2,699,294 $ 674,824 $ (4,405,422 ) $ (1,137,770 ) $ — $ (20,233 ) Denominator: Basic and diluted weighted average ordinary shares outstanding 27,600,000 6,900,000 26,589,011 6,867,033 — 6,000,000 Basic and diluted net income (loss) per ordinary share $ 0.10 $ 0.10 $ (0.17 ) $ (0.17 ) $ — $ (0.00 ) Recent Accounting Standards In August 2020, the FASB issued Accounting Standards Update (“ASU”) No. 2020-06, Debt — Debt with Conversion and Other Options (Subtopic 470-20) — Contracts in Entity’ Own Equity (Subtopic 815-40): 2020-06”), 2020-06 The Company’s management does not believe that any other recently issued, but not yet effective, accounting standards if currently adopted would have a material effect on the accompanying unaudited condensed consolidated financial statements.

Initial Public Offering

Initial Public Offering	6 Months Ended		9 Months Ended
	Jan. 11, 2021	Dec. 31, 2020	Sep. 30, 2021
Ivanhoe Capital Acquisition Corp [Member]
Initial Public Offering	NOTE 4. INITIAL PUBLIC OFFERING On January 11, 2021, the Company consummated its Initial Public Offering of 27,600,000 Units, including 3,600,000 Over-Allotment Units, at $10.00 per Unit, generating gross proceeds of $276.0 million, and incurring offering costs of approximately $15.8 million, of which approximately $9.7 million was for deferred underwriting commissions. Each Unit consists of one Class A ordinary share and one	NOTE 3. INITIAL PUBLIC OFFERING On January 11, 2021, the Company consummated its Initial Public Offering of 27,600,000 Units, including 3,600,000 Over-Allotment Units, at $10.00 per Unit, generating gross proceeds of $276.0 million, and incurring offering costs of approximately $15.8 million, of which approximately $9.7 million was for deferred underwriting commissions. Each Unit consists of one Class A ordinary share and one	Note 3 — Initial Public Offering On January 11, 2021, the Company consummated its Initial Public Offering of 27,600,000 Units, including 3,600,000 Over-Allotment Units, at $10.00 per Unit, generating gross proceeds of $276.0 million, and incurring offering costs of approximately $15.8 million, of which approximately $9.7 million was for deferred underwriting commissions. Each Unit consists of one Class A ordinary share and one

Related Party Transactions

Related Party Transactions	6 Months Ended		9 Months Ended	12 Months Ended
	Jan. 11, 2021	Dec. 31, 2020	Sep. 30, 2021	Dec. 31, 2020
Related Party Transactions			12. Related-Party Transactions As of September 30, 2021 and December 31, 2020, the following were considered as related parties due to their role in the Company and/or voting interest on a fully diluted basis: Voting Voting in 2021 on a in 2020 on a fully diluted fully diluted Name Role basis basis Dr. Qichao Hu Chief Executive Officer, Founder and Board representation 13.4 % 15.5 % Long Siang Pte. Ltd Board representation 8.3 % 9.6 % Vertex Legacy Continuation Fund Pte. Ltd Board representation 9.7 % 10.8 % General Motors Ventures LLC Board representation 7.0 % 7.3 % Tianqi Lithium HK Co., Ltd. Board representation 9.3 % 10.8 % Anderson Investments Pte. Ltd. Board representation 8.7 % 10.0 % SK Holdings Board representation 12.9 % 11.9 % Refer to Note 13, Partnerships, below for related party transactions with General Motors.	17. Related-Party Transactions As of December 31, 2020 and 2019, the following were considered related parties due to their role in the Company and/or voting interest on a fully diluted basis: Name Role Voting Interest in 2020 and 2019 on a fully diluted basis Dr. Qichao Hu Chief Executive Officer, Founder and Board representation 15.47 % Long Siang Pte. Ltd. Board representation 9.58 % Vertex Legacy Continuation Fund Pte. Ltd. Board representation 10.79 % General Motors Ventures LLC Board representation 7.25 % Tianqi Lithium HK Co., Ltd. Board representation 10.76 % Anderson Investments Pte. Ltd. Board representation 10.04 % SK Holdings Board representation 11.89 % There were no material transactions with any of the related parties during the years ended December 31, 2020 and 2019.
Ivanhoe Capital Acquisition Corp [Member]
Related Party Transactions	NOTE 6. RELATED PARTY TRANSACTIONS Founder Shares On July 22, 2020, the Sponsor paid an aggregate of $25,000 for certain expenses on behalf of the Company in exchange for issuance of 8,625,000 Class B ordinary shares (the “Founder Shares”). On December 16, 2020, the Sponsor surrendered 2,875,000 Founder Shares to the Company for cancellation for no consideration. On January 6, 2021, the Company effected a share capitalization of 1,150,000 shares, resulting in an aggregate of 6,900,000 Founder Shares outstanding. The holders of the Founder Shares had agreed to forfeit up to an aggregate of 900,000 Founder Shares, on a pro rata basis, to the extent that the option to purchase additional units was not exercised in full by the underwriters, so that the Founder Shares would represent 20% of the Company’s issued and outstanding shares after the Initial Public Offering. On January 11, 2021, the underwriter fully exercised its over-allotment option; thus, these Founder Shares were no longer subject to forfeiture. The Initial Shareholders agreed not to transfer, assign or sell any of their Founder Shares until the earlier to occur of (i) (v) with respect to 20% of such shares, until consummation of the initial Business Combination, 30-trading Business Combination that results in all of the shareholders having the right to exchange Related Party Loans On July 22, 2020, the Sponsor agreed to loan the Company pursuant to a promissory note, which was later amended on December 1, 2020 (the “Note”) up to $600,000 to be used for the payment of costs related to the Initial Public Offering pursuant to a promissory note (the “Note”). The Note was non-interest In addition, in order to finance transaction costs in connection with a Business Combination, the Sponsor, members of the Company’s founding team or any of their affiliates may, but are not obligated to, loan the Company funds as may be required (“Working Capital Loans”). If the Company completes a Business Combination, the Company would repay the Working Capital Loans out of the proceeds of the Trust Account released to the Company. Otherwise, the Working Capital Loans would be repaid only out of funds held outside the Trust Account. In the event that a Business Combination does not close, the Company may use a portion of proceeds held outside the Trust Account to repay the Working Capital Loans but no proceeds held in the Trust Account would be used to repay the Working Capital Loans. The Working Capital Loans would either be repaid upon consummation of a Business Combination, without interest, or, at the lenders’ discretion, up to $1.5 million of such Working Capital Loans may be convertible into warrants of the post Business Combination entity at a price of $1.50 per warrant. The warrants would be identical to the Private Placement Warrants. Except for the foregoing, the terms of such Working Capital Loans, if any, have not been determined and no written agreements exist with respect to such loans. As of January 11, 2021, the Company had no borrowings under the Working Capital Loans. Administrative Services Agreement Commencing on the date that the Company’s securities were first listed on the NYSE through the earlier of consummation of the initial Business Combination and the liquidation, the Company agreed to pay the Sponsor $10,000 per month for office space, utilities, secretarial and administrative support services provided to members of the management team. In addition, the Sponsor, officers and directors, or any of their respective affiliates will be reimbursed for any out-of-pocket directors, or the Company’s or their affiliates. Any such payments prior to an initial Business Combination will be made from funds held outside the Trust Account.	NOTE 5. RELATED PARTY TRANSACTIONS Founder Shares On July 22, 2020, the Sponsor paid an aggregate of $25,000 for certain expenses on behalf of the Company in exchange for issuance of 8,625,000 Class B ordinary shares (the “Founder Shares”). On December 16, 2020, the Sponsor surrendered 2,875,000 Founder Shares to the Company for cancellation for no consideration. On January 6, 2021, the Company effected a share capitalization of 1,150,000 shares, resulting in an aggregate of 6,900,000 Founder Shares outstanding. All shares and associated amounts have been retroactively restated to reflect the share surrender and share capitalization. The holders of the Founder Shares have agreed to forfeit up to an aggregate of 900,000 Founder Shares, on a pro rata basis, to the extent that the option to purchase additional units was not exercised in full by the underwriters, so that the Founder Shares would represent 20% of the Company’s issued and outstanding shares after the Initial Public Offering. On January 11, 2021, the underwriter fully exercised its over-allotment option; thus, these Founder Shares are no longer subject to forfeiture. The Initial Shareholders agreed not to transfer, assign or sell any of their Founder Shares until the earlier to occur of (i) (v) with respect to 20% of such shares, until consummation of the initial Business Combination, (w) with respect to 20% of such shares, until the closing price of Class A ordinary shares equals or exceeds $12.00 for any 20 trading days within a 30-trading Related Party Loans On July 22, 2020, the Sponsor agreed to loan the Company up to $600,000 pursuant to a promissory note (the “Note”), which was later amended on December 1, 2020. The Note is non-interest due upon the closing of the Initial Public Offering. The Company borrowed $500,000 under the Note. On January 15, 2021, the Company repaid the Note in full. In addition, in order to finance transaction costs in connection with a Business Combination, the Sponsor, members of the Company’s founding team or any of their affiliates may, but are not obligated to, loan the Company funds as may be required (“Working Capital Loans”). If the Company completes a Business Combination, the Company would repay the Working Capital Loans out of the proceeds of the Trust Account released to the Company. Otherwise, the Working Capital Loans would be repaid only out of funds held outside the Trust Account. In the event that a Business Combination does not close, the Company may use a portion of proceeds held outside the Trust Account to repay the Working Capital Loans but no proceeds held in the Trust Account would be used to repay the Working Capital Loans. The Working Capital Loans would either be repaid upon consummation of a Business Combination, without interest, or, at the lenders’ discretion, up to $1.5 million of such Working Capital Loans may be convertible into warrants of the post Business Combination entity at a price of $1.50 per warrant. The warrants would be identical to the Private Placement Warrants. Except for the foregoing, the terms of such Working Capital Loans, if any, have not been determined and no written agreements exist with respect to such loans. To date, the Company had no borrowings under the Working Capital Loans. Administrative Services Agreement Commencing on the date that the Company’s securities were first listed on the NYSE through the earlier of consummation of the initial Business Combination and the liquidation, the Company agreed to pay the Sponsor $10,000 per month for office space, utilities, secretarial and administrative support services provided to members of the management team. In addition, the Sponsor, officers and directors, or any of their respective affiliates will be reimbursed for any out-of-pocket	Note 5 — Related Party Transactions Founder Shares On July 22, 2020, the Sponsor paid an aggregate of $25,000 for certain expenses on behalf of the Company in exchange for issuance of 8,625,000 Class B ordinary shares (the “Founder Shares”). On December 16, 2020, the Sponsor surrendered 2,875,000 Founder Shares to the Company for cancellation for no consideration. On January 6, 2021, the Company effected a share capitalization of 1,150,000 shares, resulting in an aggregate of 6,900,000 Founder Shares outstanding. All shares and associated amounts have been retroactively restated to reflect the share surrender and share capitalization. The holders of the Founder Shares have agreed to forfeit up to an aggregate of 900,000 Founder Shares, on a pro rata basis, to the extent that the option to purchase additional units was not exercised in full by the underwriters, so that the Founder Shares would represent 20% of the Company’s issued and outstanding shares after the Initial Public Offering. On January 11, 2021, the underwriter fully exercised its over-allotment option; thus, these Founder Shares are no longer subject to forfeiture. The Initial Shareholders agreed not to transfer, assign or sell any of their Founder Shares until the earlier to occur of (i) (v) with respect to 20 30-trading performance requirements that are less than the Per Share Transaction Value will be released, and (b) the number of Founder Shares that would be released upon the achievement of the next share price performance requirement that is higher than the Per Share Transaction Value (the “Release Threshold”), multiplied by a fraction, the numerator of which equals (x) 2, minus (y) the amount by which the Release Threshold exceeds the Per Share Transaction Value, and the denominator of which equals 2, will be released. Any Founder Shares not released pursuant to the preceding sentence will be forfeited and cancelled. Related Party Loans On July 22, 2020, the Sponsor agreed to loan the Company up to $600,000 pursuant to a promissory note (the “Note”), which was later amended on December 1, 2020. The Note is non-interest In addition, in order to finance transaction costs in connection with a Business Combination, the Sponsor, members of the Company’s founding team or any of their affiliates may, but are not obligated to, loan the Company funds as may be required (“Working Capital Loans”). If the Company completes a Business Combination, the Company would repay the Working Capital Loans out of the proceeds of the Trust Account released to the Company. Otherwise, the Working Capital Loans would be repaid only out of funds held outside the Trust Account. In the event that a Business Combination does not close, the Company may use a portion of proceeds held outside the Trust Account to repay the Working Capital Loans but no proceeds held in the Trust Account would be used to repay the Working Capital Loans. The Working Capital Loans would either be repaid upon consummation of a Business Combination, without interest, or, at the lenders’ discretion, up to $1.5 million of such Working Capital Loans may be convertible into warrants of the post Business Combination entity at a price of $1.50 per warrant. The warrants would be identical to the Private Placement Warrants. Except for the foregoing, the terms of such Working Capital Loans, if any, have not been determined and no written agreements exist with respect to such loans. On April 9, 2021, the Company issued an unsecured convertible promissory note (the “Convertible Note”) to the Company’s Chief Executive Officer, pursuant to which the Company may borrow up to $1,500,000 for ongoing expenses reasonably related to the business of the Company and the consummation of the Business Combination. The Convertible Note does not bear any interest. All unpaid principal under the Convertible Note will be due and payable in full on the earlier of (i) January 11, 2023 and (ii) the effective date of the Business Combination (such earlier date, the “Maturity Date”). The Chief Executive Officer will have the option, at any time on or prior to the Maturity Date, to convert any amounts outstanding under the Convertible Note into warrants to purchase the Company’s Class A ordinary shares, par value $0.0001 per share, at a conversion price of $1.50 per warrant, with each warrant entitling the holder to purchase one Class A ordinary share at a price of $11.50 per share, subject to the same adjustments applicable to the private placement warrants sold concurrently with the Company’s I P O Administrative Services Agreement Commencing on the date that the Company’s securities were first listed on the NYSE through the earlier of consummation of the initial Business Combination and the liquidation, the Company agreed to pay the Sponsor $10,000 per month for office space, utilities, secretarial and administrative support services provided to members of the management team. Administrative expenses were included within general and administrative expenses — related party in the unaudited condensed consolidated statements of operations. For the three and nine months ended September 30, 2021, the Company incurred $ and $ in administrative expenses, respectively. As of September 30, 2021, $ has been included in due to related party on the unaudited condensed consolidated balance sheets. There were administrative expenses incurred for the period from July 8, 2020 (inception) through September 30, 2020. In addition, the Sponsor, officers and directors, or any of their respective affiliates will be reimbursed for any out-of-pocket

Private Placement

Private Placement	6 Months Ended		9 Months Ended
	Jan. 11, 2021	Dec. 31, 2020	Sep. 30, 2021
Ivanhoe Capital Acquisition Corp [Member]
Private Placement	NOTE 5. PRIVATE PLACEMENT Simultaneously with the closing of the Initial Public Offering, the Company consummated the Private Placement of 5,013,333 Private Placement Warrants, at a price of $1.50 per Private Placement Warrant with the Sponsor, generating gross proceeds of approximately $7.5 million. Each whole Private Placement Warrant is exercisable for one whole Class A ordinary share at a price of $11.50 per share. A portion of the proceeds from the sale of the Private Placement Warrants to the Sponsor was added to the proceeds from the Initial Public Offering held in the Trust Account. If the Company does not complete a Business Combination within the Combination Period, the Private Placement Warrants will expire worthless. The Private Placement Warrants will be non-redeemable The Sponsor and the Company’s officers and directors agreed, subject to limited exceptions, not to transfer, assign or sell any of their Private Placement Warrants until 30 days after the completion of the initial Business Combination.	NOTE 4. PRIVATE PLACEMENT Simultaneously with the closing of the Initial Public Offering, the Company consummated the Private Placement of 5,013,333 Private Placement Warrants, at a price of $1.50 per Private Placement Warrant with the Sponsor, generating gross proceeds of approximately $7.5 million. Each whole Private Placement Warrant is exercisable for one whole Class A ordinary share at a price of $11.50 per share. A portion of the proceeds from the sale of the Private Placement Warrants to the Sponsor was added to the proceeds from the Initial Public Offering held in the Trust Account. If the Company does not complete a Business Combination within the Combination Period, the Private Placement Warrants will expire worthless. The Private Placement Warrants will be non-redeemable The Sponsor and the Company’s officers and directors agreed, subject to limited exceptions, not to transfer, assign or sell any of their Private Placement Warrants until 30 days after the completion of the initial Business Combination.	Note 4 — Private Placement Simultaneously with the closing of the Initial Public Offering, the Company consummated the Private Placement of 5,013,333 Private Placement Warrants, at a price of $ 1.50 Each whole Private Placement Warrant is exercisable for one whole Class A ordinary share at a price of $11.50 per share. A portion of the proceeds from the sale of the Private Placement Warrants to the Sponsor was added to the proceeds from the Initial Public Offering held in the Trust Account. If the Company does not complete a Business Combination within the Combination Period, the Private Placement Warrants will expire worthless. The Private Placement Warrants will be non-redeemable The Sponsor and the Company’s officers and directors agreed, subject to limited exceptions, not to transfer, assign or sell any of their Private Placement Warrants until 30 days after the completion of the initial Business Combination.

Cash, Cash Equivalents, and Res

Cash, Cash Equivalents, and Restricted Cash	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Cash, Cash Equivalents, and Restricted Cash	3. Cash, Cash Equivalents, and Restricted Cash Cash, cash equivalents, and restricted cash consisted of the following (in thousands): September 30, December 31, 2021 2020 (Unaudited) Cash $ 25,098 $ 1,335 Cash equivalents: Money market funds . 4,995 1,104 Restricted cash: Certificates of deposit . 547 289 Total cash, cash equivalents, and restricted cash $ 30,640 $ 2,728 Restricted cash are money market funds held in collateral accounts that are restricted to secure letters of credit for corporate lease activity. The letters of credit are required to be maintained throughout the terms of the leases. If the date of availability or disbursement is longer than one year and the balances are maintained under an agreement that legally restricts the use of such funds, restricted cash is not included within cash and cash equivalents and is reported separately on the condensed consolidated balance sheets. If the date of availability or disbursement is less than one-year,	3. Cash, Cash Equivalents, and Restricted Cash Cash, cash equivalents, and restricted cash consisted of the following (in thousands): December 31, 2020 2019 Cash $ 1,335 $ 201 Cash equivalents: Money market funds 1,104 25,198 Restricted cash: Certificates of deposit 289 583 Total cash, cash equivalents, and restricted cash $ 2,728 $ 25,982

Fair Value Measurements

Fair Value Measurements	6 Months Ended	9 Months Ended	12 Months Ended
	Jan. 11, 2021	Sep. 30, 2021	Dec. 31, 2020
Fair Value Measurements		4. Fair Value The following table presents information about the Company’s financial assets measured at fair value on a recurring basis (in thousands): September 30, 2021 (Unaudited) Level 1 Level 2 Level 3 Total Assets Cash equivalents in money market funds $ 4,995 $ — $ — $ 4,995 Restricted cash: — 547 — 547 Short-term investments: Time deposit — 150,000 — 150,000 $ 4,995 $ 150,547 $ — $ 155,542 December 31, 2020 Level 1 Level 2 Level 3 Total Assets Cash equivalents in money market funds $ 1,104 $ — $ — $ 1,104 Restricted cash — 289 — 289 Short-term investments: Corporate bonds — 4,299 — 4,299 Mutual funds — 7,992 — 7,992 $ 1,104 $ 12,580 $ — $ 13,684 As of September 30, 2021, the short-term investments consist of interest-bearing time deposit placed with major commercial bank in Singapore. The time deposit is classified as held-to-maturity available-for-sale.	4. Fair Value The following table presents information about the Company’s financial assets measured at fair value on a recurring basis (in thousands): December 31, 2020 Level 1 Level 2 Level 3 Total Assets Cash equivalents in money market funds $ 1,104 $ — $ — $ 1,104 Restricted cash — 289 — 289 Short-term investments: Corporate bonds — 4,299 — 4,299 Mutual funds — 7,992 — 7,992 $ 1,104 $ 12,580 $ — $ 13,684 December 31, 2019 Level 1 Level 2 Level 3 Total Assets Cash equivalents in money market funds $ 25,198 $ — $ — $ 25,198 Restricted cash — 583 — 583 $ 25,198 $ 583 $ — $ 25,781
Ivanhoe Capital Acquisition Corp [Member]
Fair Value Measurements	NOTE 11 — FAIR VALUE MEASUREMENTS The following table presents information about the Company’s liabilities that are measured at fair value on a recurring basis as of January 11, 2021 and indicates the fair value hierarchy of the valuation techniques that the Company utilized to determine such fair value: Description Quoted Prices in Significant Other Observable (Level 2) Significant Other Unobservable (Level 3) Liabilities: Derivative warrant liabilities – Public Warrants $ — $ — $ 14,628,000 Derivative warrant liabilities – Private Placement Warrants $ — $ — $ 7,520,000 Transfers to/from Levels 1, 2, and 3 are recognized at the beginning of the reporting period. Level 3 instruments are comprised of derivative warrant liabilities measured at fair value using a Monte Carlo simulation and Black-Scholes Option Pricing Model. The estimated fair value of the Private Placement Warrants and the Public Warrants was determined using Level 3 inputs. Inherent in a Monte Carlo simulation and Black-Scholes Option Pricing model are assumptions related to expected stock-price volatility, expected life, risk-free interest rate and dividend yield. The Black-Scholes analysis relies upon appropriate inputs derived from the Monte Carlo simulation of the public warrants; namely, the underlying stock price and the implied volatility from the traded Public Warrant price. The Company estimates the volatility of its ordinary shares’ warrants based on implied volatility from the Company’s traded warrants and from historical volatility of select peer company’s ordinary shares that matches the expected remaining life of the warrants. The risk-free interest rate is based on the U.S. Treasury zero-coupon The following table provides quantitative information regarding Level 3 fair value measurements inputs at their measurement date: As of Option term (in years) 6.47 Stock price $ 9.91 Volatility 14.0 % Risk-free interest rate 0.75 % Expected dividends 0.00 %	Note 10 — Fair Value Measurements The following table presents information about the Company’s financial assets and liabilities that are measured at fair value on a recurring basis as of September 30, 2021 and indicates the fair value hierarchy of the valuation techniques that the Company utilized to determine such fair value: Description Quoted Prices in Significant Other Significant Other Assets: Investments held in Trust Account $ 276,052,152 $ — $ — Liabilities: Derivative warrant liabilities – Public Warrants $ 13,340,000 $ — $ — Derivative warrant liabilities – Private Placement Warrants $ — $ — $ 7,419,730 Convertible note – related party $ — $ — $ 1,064,140 As of December 31, 2020, there were no assets or liabilities that are measured at fair value on a recurring basis. Transfers to/from Levels 1, 2, and 3 are recognized at the beginning of the reporting period. The estimated fair value of the Public Warrants transferred from a Level 3 measurement to a Level 1 fair value measurement in February 2021, when the Public Warrants were separately listed and traded. There were no other transfers to/from Levels 1, 2, and 3 during the three and nine months ended September 30, 2021. Level 1 assets include investments in money market funds that invest solely in U.S. government securities. The Company uses inputs such as actual trade data, quoted market prices from dealers or brokers, and other similar sources to determine the fair value of its investments. The fair value of the Public Warrants as of September 30, 2021 was measured utilizing the Level 1 input of the observable listed trading price for such warrants. Level 3 instruments are comprised of derivative warrant liabilities measured at fair value using a Monte Carlo simulation and Black-Scholes Option Pricing Model. The estimated fair value of the Private Placement Warrants and the Public Warrants, prior to being separately listed and traded, was determined using Level 3 inputs. The estimated fair value of warrants that may be issued upon conversion of the Convertible Note was determined using Level 3 inputs. Inherent in a Monte Carlo simulation and Black-Scholes Option Pricing model are assumptions related to expected stock-price volatility, expected life, risk-free interest rate and dividend yield. The Black-Scholes analysis relies upon appropriate inputs derived from the Monte Carlo simulation of the public warrants; namely, the underlying stock price and the implied volatility from the traded Public Warrant price. The Company estimates the volatility of its ordinary shares warrants based on implied volatility from the Company’s traded warrants and from historical volatility of select peer company’s ordinary shares that matches the expected remaining life of the warrants. The risk-free interest rate is based on the U.S. Treasury zero-coupon The following table provides quantitative information regarding Level 3 fair value measurements inputs at their measurement dates: As of September 30, 2021 Option term (in years) 5.09 Stock price $ 9.90 Volatility 21.1 % Risk-free interest rate 0.99 % Expected dividends — % The following table provides quantitative information regarding Level 3 fair value measurements inputs used by the estimated fair value of warrants that may be issued upon conversion of the Convertible Note at their measurement dates: As of September 30, 2021 As of April 15, 2021 Option term (in years) 0.21 0.55 Stock price $ 1.48 $ 1.38 Volatility 72.0 % 67.5 % Risk-free interest rate 0.05 % 0.04 % Expected dividends — % — % The change in the fair value of the derivative warrant liabilities measured using Level 3 inputs for the three and nine months ended September 30, 2021 is summarized as follows: Derivative warrant liabilities at January 1, 2021 $ — Issuance of Public and Private Warrants 22,148,000 Transfer of Public Warrants to Level 1 measurement (14,628,000 ) Change in fair value of derivative warrant liabilities (451,200 ) Derivative warrant liabilities at March 31, 2021 7,068,800 Change in fair value of derivative warrant liabilities 2,576,360 Derivative warrant liabilities at June 30, 2021 9,645,160 Change in fair value of derivative warrant liabilities (2,225,430 ) Derivative warrant liabilities at September 30, 2021 $ 7,419,730 The change in the fair value of the convertible note — related party measured with Level 3 inputs for the three and the nine months ended September 30, 2021 is summarized as follows: Fair Value at January 1, 2021 $ — Initial fair value of convertible note – related party – second quarter 500,000 Change in fair value of convertible note – related party 131,260 Fair Value of convertible note – related party, June 30, 2021 631,260 Initial fair value of convertible note – related party – third quarter 444,694 Change in fair value of convertible note – related party (11,814 ) Fair Value of convertible note – related party, September 30, 2021 $ 1,064,140

Property And Equipment, Net

Property And Equipment, Net	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment Disclosure	5. Property and Equipment, net Property and equipment, net consisted of the following (in thousands): December 31, 2020 2019 Laboratory machinery and equipment $ 6,227 $ 5,878 Office and computer equipment 234 213 Leasehold improvements 3,369 3,306 9,830 9,397 Less: Accumulated depreciation (3,786 ) (2,212 ) Property and equipment, net $ 6,044 $ 7,185 Depreciation expense was $1.6 million and $0.9 million in the y e

Intangible Assets, Net

Intangible Assets, Net	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets Disclosure	6. Intangible Assets, net In April and June of 2019, the Company purchased certain patents to maintain its competitive advantage for $1.9 million. Intangible assets, net consisted of the following (in thousands): December 31, 2020 2019 Intangible assets - Patents $ 1,918 $ 1,918 Less: Accumulated amortization (190 ) (62 ) Intangible assets, net $ 1,728 $ 1,856 Patents are amortized on a straight-line basis over their estimated useful life of 15 years. Amortization expense was $0.1 million and $0.1 million in the years ended December 31, 2020 and 2019, respectively. The estimated future amortization expenses for patent assets are as follows (in thousands): Year Ending $ 128 2022 128 2023 128 2024 128 2025 128 Thereafter 1,088 Total $ 1,728

Accrued compensation, Accrued E

Accrued compensation, Accrued Expenses And Other Current Liabilities	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current	5. Accrued compensation, accrued expenses and other current liabilities The table below summarizes accrued expenses and other liabilities which consists of the following (in thousands): Accrued compensation consisted of the following (in thousands): September 30, December 31, 2021 2020 (Unaudited) Accrued bonus $ 1,014 $ 1,068 Other 995 148 Accrued compensation $ 2,009 $ 1,216 Accrued expenses and other current liabilities consisted of the following (in thousands): September 30, December 31, 2021 2020 (Unaudited) Deferred rent liabilities $ 239 $ 231 Payments received under joint development agreements 136 160 Accrued professional services 403 — Income taxes payable 137 115 Other 437 282 Accrued expenses and other current liabilities $ 1,352 $ 788	7. Accrued compensation, accrued expenses and other current liabilities The table below summarizes accrued expenses and other liabilities which consists of the following (in thousands): Accrued compensation consisted of the following (in thousands): December 31, 2020 2019 Accrued bonus $ 1,068 $ 441 Other 148 145 Accrued compensation $ 1,216 $ 586 Accrued expenses and other current liabilities consisted of the following (in thousands): December 31, 2020 2019 Deferred rent liabilities $ 231 $ 153 Accrual related to purchase of property and equipment 69 334 Income taxes payable 115 108 Other 373 418 Accrued expenses and other current liabilities $ 788 $ 1,013

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended		9 Months Ended	12 Months Ended
	Jan. 11, 2021	Dec. 31, 2020	Sep. 30, 2021	Dec. 31, 2020
Commitments and Contingencies			6. Commitments and Contingencies Operating Leases In August 2016, the Company entered into an operating lease agreement to lease an office space in Woburn, Massachusetts with the lease term expiring in August 2021. Under the lease agreement, the Company has one five-year renewal option through August 2026. In May 2020, the Company extended the term of the lease by 5 years through August 2026. In February and March 2021, the Company amended the lease agreement. Under the terms of these amendments, the Company increased its leased space and the total base rental payments increased from approximately $0.8 million to approximately $1.5 million per year subject to annual cost of living increases up to 3%. The expiration date of the amended lease coincides with the expiration date of the original lease in accordance with the terms of prior amendments. In September 2018, the Company entered into an operating lease agreement to lease a manufacturing space in Shanghai, China with the original lease term expiring in August 2023 with renewal terms that can extend the lease term by providing application for renewal at least 90 days before the expiry. The annual rent payment per lease is $0.6 million subject to annual cost increase of 3%. In September 2021, the Company amended the lease agreement for its facility in Shanghai, China. Under the terms of this amendment, the Company increased its leased space and the total base rental payments increased to approximately $1.3 million per year. The expiration date of the amended lease will be August 2026. Upon execution of the agreements inclusive of escalating rent payments, expense is being recognized on a straight-line basis and the difference between the recognized rent expense and the amounts paid under the operating leases are being recorded as deferred rent and included in other short-term and long-term liabilities on the condensed consolidated balance sheets as follows (in thousands): September 30, December 31, 2021 2020 (Unaudited) Deferred rent included in accrued expenses and other current liabilities $ 239 $ 231 Deferred rent included in other liabilities 537 607 Total deferred rent $ 776 $ 838 Rent expense was $0.5 million and $0.3 million for the three months ended September 30, 2021 and 2020, respectively. Rent expense was $1.2 million and $0.9 million for the nine months ended September 30, 2021 and 2020, respectively. The future minimum payments at September 30, 2021 under all operating leases are as follows (in thousands): Year Ending Remainder of 2021 $ 358 2022 2,696 2023 2,449 2024 2,188 2025 2,235 Thereafter 1,389 Total future minimum lease payments $ 11,315 Legal Contingencies From time-to-time,	8. Commitments and Contingencies Operating Leases In August 2016, the Company entered into an operating lease agreement to lease an office space in Woburn, Massachusetts with the lease term expiring in August 2021. Under the lease agreement, the Company has one five-year renewal option through August 2026. In May 2020, the Company In September 2018, the Company entered into an operating lease agreement to lease a manufacturing space in Shanghai, China with the lease term expiring in August 2023 with renewal terms that can extend the lease term by providing application for renewal at least 90 days before the expiry. The annual rent payment per lease is $0.6 million subject to annual cost increase of 3%. Upon execution of the agreements inclusive of escalating rent payments, expense is being recognized on a straight-line basis and the difference between the recognized rent expense and the amounts paid under the operating leases are being recorded as deferred rent and included in other short-term and long-term liabilities on the consolidated balance sheets as follows (in thousands): December 31, 2020 2019 Deferred rent included in accrued expenses and other current liabilities $ 231 $ 153 Deferred rent included in other liabilities 607 541 Total deferred rent $ 838 $ 694 Rent expense was $1.3 million and $1.1 million for the years ended December 31, 2020 and 2019, respectively. The future minimum payments at December 31, 2020 under all operating leases are as follows (in thousands): Year Ending $ 1,408 2022 1,390 2023 1,111 2024 823 2025 837 Thereafter 567 Total future minimum lease payments $ 6,136 Standby Letter of Credit During the course of ordinary business, the Company’s financial institution issues standby letters of credit on behalf of the Company to certain vendors of the Company. As of December 31, 2020, and 2019, the total value of the letters of credit issued by the financial institution are $0.3 million and $0.6 million, respectively. The letter of credit are related to deposit which the Company is required to make under its operating lease. No amounts have been drawn under the standby letter of credit. Legal Contingencies From time-to-time,
Ivanhoe Capital Acquisition Corp [Member]
Commitments and Contingencies	NOTE 7. COMMITMENTS & CONTINGENCIES Registration and Shareholder Rights The holders of the Founder Shares, Private Placement Warrants, and warrants that may be issued upon conversion of Working Capital Loans Underwriting Agreement The Company granted the underwriters a 45-day The underwriters were entitled to an underwriting discount of $0.20 per unit, or approximately $5.5 million in the aggregate, paid upon the closing of the Initial Public Offering. In addition, $0.35 per unit, or approximately $9.7 million in the aggregate will be payable to the underwriters for deferred underwriting commissions. The deferred fee will become payable to the underwriters from the amounts held in the Trust Account solely in the event that the Company completes a Business Combination, subject to the terms of the underwriting agreement. Risks and Uncertainties Management continues to evaluate the impact of the COVID-19	NOTE 6. COMMITMENTS & CONTINGENCIES Registration and Shareholder Rights The holders of the Founder Shares, Private Placement Warrants, and warrants that may be issued upon conversion of Working Capital Loans (and any Class A ordinary shares issuable upon the exercise of the Private Placement Warrants and warrants that may be issued upon conversion of Working Capital Loans) were entitled to registration rights pursuant to a registration and shareholder rights agreement signed upon the effective date of the Initial Public Offering. The holders of these securities were entitled to make up to three demands, excluding short form demands, that the Company registers such securities. In addition, the holders have certain “piggy-back” registration rights with respect to registration statements filed subsequent to the completion of the initial Business Combination. The Company will bear the expenses incurred in connection with the filing of any such registration statements. Underwriting Agreement The Company granted the underwriters a 45-day The underwriters were entitled to an underwriting discount of $0.20 per unit, or approximately $5.5 million in the aggregate, paid upon the closing of the Initial Public Offering. In addition, $0.35 per unit, or approximately $9.7 million in the aggregate will be payable to the underwriters for deferred underwriting commissions. The deferred fee will become payable to the underwriters from the amounts held in the Trust Account solely in the event that the Company completes a Business Combination, subject to the terms of the underwriting agreement. Risks and Uncertainties Management continues to evaluate the impact of the COVID-19	Note 6 — Commitments and Contingencies Registration and Shareholder Rights The holders of the Founder Shares, Private Placement Warrants, and warrants that may be issued upon conversion of Working Capital Loans (and any Class A ordinary shares issuable upon the exercise of the Private Placement Warrants and warrants that may be issued upon conversion of Working Capital Loans) were entitled to registration rights pursuant to a registration and shareholder rights agreement signed upon the effective date of the Initial Public Offering. The holders of these securities were entitled to make up to three demands, excluding short form demands, that the Company registers such securities. In addition, the holders have certain “piggy-back” registration rights with respect to registration statements filed subsequent to the completion of the initial Business Combination. The Company will bear the expenses incurred in connection with the filing of any such registration statements. Underwriting Agreement The Company granted the underwriters a 45-day The underwriters were entitled to an underwriting discount of $0.20 per unit, or approximately $5.5 million in the aggregate, paid upon the closing of the Initial Public Offering. In addition, $0.35 per unit, or approximately $9.7 million in the aggregate will be payable to the underwriters for deferred underwriting commissions. The deferred fee will become payable to the underwriters from the amounts held in the Trust Account solely in the event that the Company completes a Business Combination, subject to the terms of the underwriting agreement.

Note payable

Note payable	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Note payable	9. Note payable In April 2020, the Company applied for and received $0.8 million in PPP Note. Under the terms of the PPP Note, interest accrues on the outstanding principal at the rate of 1% per annum. Interest expense under the PPP Note was not material for the year ended December 31, 2020. The PPP Note is a forgivable loan and subsequent to year end, the Company received full forgiveness of all principal and interest in February 2021.

Redeemable Convertible Preferre

Redeemable Convertible Preferred Stock	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Temporary Equity Disclosure [Abstract]
Redeemable Convertible Preferred Stock	7. Redeemable Convertible Preferred Stock In April 2021, the Company entered into a stock purchase agreement whereby certain investors agreed to purchase $138.5 million in Series D redeemable convertible preferred stock, $0.000001 par value per share. Upon closing of the financing transaction in April 2021, the investors purchased 4,869,854 shares of Series D redeemable convertible preferred stock. In May 2021, the Company entered into a stock purchase agreement whereby an investor agreed to purchase $50.0 million in Series D plus redeemable convertible preferred stock, $0.000001 par value per share. Upon closing of the financing transaction in May 2021, the investor purchased 1,698,088 shares of Series D plus redeemable convertible preferred stock. The proceeds from the issuance of Series D and Series D plus redeemable convertible preferred stock will be used in future research and development activities and which may include the building of manufacturing prototyping lines for A-Sample pre- 2024. September 30, 2021 Series Issue Price per share Shares Authorized Shares Issued and Outstanding Liquidation Amount Carrying Amount Series A $ 0.8340 5,395,685 5,395,685 $ 4,500 $ 4,413 Series B $ 2.2513 5,108,073 5,108,073 11,500 11,362 Series C $ 2.8652 12,789,050 12,789,050 36,643 36,324 Series C plus $ 4.8361 6,203,345 6,203,345 30,000 29,945 Series D $ 28.4413 4,869,854 4,869,854 138,505 138,257 Series D plus $ 29.4449 1,698,088 1,698,088 50,000 49,640 36,064,095 36,064,095 $ 271,148 $ 269,941 December 31, 2020 Series Issue Price Shares Shares Issued Liquidation Carrying Series A $ 0.8340 5,395,685 5,395,685 $ 4,500 $ 4,413 Series B $ 2.2513 5,108,073 5,108,073 11,500 11,362 Series C $ 2.8652 12,789,050 12,789,050 36,643 36,324 Series C plus $ 4.8361 6,203,345 6,203,345 30,000 29,945 29,496,153 29,496,153 $ 82,643 $ 82,044 Voting The holders of Series A, Series B, Series C, Series C plus, Series D and Series D plus redeemable convertible preferred stock are entitled to vote on all matters on which the common stockholders are entitled to vote. On such matters, holders of Series A, Series B, Series C, Series C plus, Series D and Series D plus redeemable convertible preferred and common stock vote together with the holders of common stock as a single class. Each holder of the Series A, Series B, Series C, Series C plus, Series D and Series D plus redeemable convertible preferred stock is entitled to the number of votes equal to the number of shares of common stock into which the shares of redeemable convertible preferred stock held by such holder could then be converted. Conversion Shares of redeemable convertible preferred stock are convertible into common stock at the holders’ option at any time after the date of issuance of such share or automatically (i) immediately prior to the closing of a firm commitment underwritten public offering of the Company’s common stock at a price per share at least 2 times the Series D and Series D plus issuance price and with gross proceeds to the Company of at least $100 million, net of underwriting commission and discounts or (ii) upon the vote or receipt by the Company of a written request for such conversion from the holders of the 66% of the redeemable convertible preferred stock then outstanding, voting as a single class and on an as-converted any. Liquidation In the event of any liquidation of the Company, sale, lease, transfer, exclusive license or other disposition of all or substantially all of the assets of the Company, dissolution, or winding up of the Company, the holders of Series A, Series B, Series C, Series C plus, Series D and Series D plus redeemable convertible preferred stock will be entitled to receive, in preference to any distribution to the holders of common stock, an amount per share equal to the applicable issuance price together with any other dividends declared but unpaid thereon on each share of redeemable convertible preferred stock. If the assets of the Company legally available for distribution to the holders of given Series of redeemable convertible preferred stock are insufficient to permit the payment to such holders of the full amounts of a given Series, then the assets of the Company will be distributed on a pro rata basis among the holders of such Series of redeemable convertible preferred stock in proportion to the full amounts they would otherwise be entitled to receive pursuant to their liquidation preference. After the payment to the holders of redeemable convertible preferred stock of the full amounts above, the remaining assets of the Company will be distributed with equal priority and pro rata among the holders of the redeemable convertible preferred stock on an as-converted Dividends The holders of the Series A, Series B, Series C, Series C plus, Series D and Series D plus redeemable convertible preferred stock are entitled to receive dividends, when and if declared by the Board of Directors subject to adjustment for stock splits, stock dividends, combination of shares, reorganization, recapitalization, reclassification, or other similar event. The dividends are payable in preference and priority to any payment of any dividend on the common stock of the Company and are noncumulative. No dividends were declared by the Board of Directors during the nine months ended September 30, 2021. Redemption The redeemable convertible preferred stock is recorded in mezzanine equity because while it is not mandatorily redeemable, it will become redeemable at the option of the preferred stockholders upon the occurrence of certain deemed liquidation events that are considered not solely within the Company’s control.	10. Redeemable Convertible Preferred Stock Redeemable Convertible Preferred Stock. The Company has the following redeemable convertible preferred stock issued and outstanding (in thousands, except share and per share data): December 31, 2020 and 2019 Issue Price Shares Shares Issued Liquidation Carrying Series per share Authorized and Outstanding Amount Amount Series A $ 0.8340 5,395,685 5,395,685 $ 4,500 $ 4,413 Series B $ 2.2513 5,108,073 5,108,073 11,500 $ 11,362 Series C $ 2.8652 12,789,050 12,789,050 36,643 $ 36,324 Series C plus $ 4.8361 6,203,345 6,203,345 30,000 $ 29,945 29,496,153 29,496,153 $ 82,643 $ 82,044 Issuance of Redeemable Convertible Preferred Stock On November 6, 2018, the Company entered into a purchase agreement whereby the investors agreed to purchase 5,970,763 Series C plus redeemable convertible preferred stock, $0.000001 par value per share, at a per share price of $4.8361 for $28.9 million. The first closing of the financing transaction was completed in November 2018. The second closing of the financing transaction was completed in February 2019 and July 2019, whereby the investors purchased 232,582 shares of Series C plus redeemable convertible preferred stock in exchange for $1.1 million. Voting The holders of Series A, Series B, Series C and Series C plus redeemable convertible preferred stock are entitled to vote on all matters on which the common stockholders are entitled to vote. On such matters, holders of Series A, Series B, Series C and Series C plus redeemable convertible preferred and common stock vote together with the holders of common stock as a single class. Each holder of the Series A, Series B, Series C and Series C plus redeemable convertible preferred stock is entitled to the number of votes equal to the number of shares of common stock into which the shares of redeemable convertible preferred stock held by such holder could then be converted. Conversion Shares of redeemable convertible preferred stock are convertible into common stock at the holders’ option at any time after the date of issuance of such share or automatically (i) immediately prior to the closing of a firm commitment underwritten public offering of the Company’s common stock at a price per share at least 2 times the Series C issuance price and with gross proceeds to the Company of at least $100 million, net of underwriting commission and discounts or (ii) upon the vote or receipt by the Company of a written request for such conversion from the holders of the 66% of the redeemable convertible preferred stock then outstanding, voting as a single class and on an as-converted Liquidation In the event of any liquidation of the Company, sale, lease, transfer, exclusive license or other disposition of all or substantially all of the assets of the Company, dissolution, or winding up of the Company, the holders of Series A, Series B, Series C and Series C plus redeemable convertible preferred stock will be entitled to receive, in preference to any distribution to the holders of common stock, an amount per share equal to the applicable issuance price together with any other dividends declared but unpaid thereon on each share of redeemable convertible preferred stock. If the assets of the Company legally available for distribution to the holders of given Series of redeemable convertible preferred stock are insufficient to permit the payment to such holders of the full amounts of a given Series, then the assets of the Company will be distributed on a pro rata basis among the holders of such Series of redeemable convertible preferred stock in proportion to the full amounts they would otherwise be entitled to receive pursuant to their liquidation preference. After the payment to the holders of redeemable convertible preferred stock of the full amounts above, the remaining assets of the Company will be distributed with equal priority and pro rata among the holders of the redeemable convertible preferred stock on an as-converted Dividends The holders of the Series A, Series B, Series C and Series C plus redeemable convertible preferred stock are entitled to receive dividends, when and if declared by the Board of Directors subject to adjustment for stock splits, stock dividends, combination of shares, reorganization, recapitalization, reclassification, or other similar event. The dividends are payable in preference and priority to any payment of any dividend on the common stock of the Company and are noncumulative. No dividends were declared by the Board of Directors for the years ended December 31, 2020 and 2019, respectively. Redemption The redeemable convertible preferred stock is recorded in mezzanine equity because while it is not mandatorily redeemable, it will become redeemable at the option of the preferred stockholders upon the occurrence of certain deemed liquidation events that are considered not solely within the Company’s control.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Share-based Payment Arrangement	8. Stock-Based Compensation The Company’s 2018 Stock Incentive Plan (the “2018 Plan”) permits the granting of incentive stock options (“ISOs”) and non-statutory non-statutory Option awards are granted with an exercise price equal to the fair value of the Company’s common stock at the date of grant. The options issued under the 2018 Plan, which were rolled into the 2021 Plan, generally vest 25% upon completion of one year of service and 1/48 per month thereafter, however in certain instances options have been granted with immediate vesting. Options under the Plan generally expire 10 years from the date of grant. The following table summarizes the activity under the Company’s stock option plan (in thousands, except per share amount and contractual term): Number of Weighted- Number of Shares Average Shares Underlying Weighted- Remaining Aggregate Available Outstanding Average Exercise Contractual Intrinsic for Grant Options Price per Share Term (in years) Value Outstanding - 2,564,190 1,157,769 $ 0.72 7.8 $ 243 Additional shares authorized 486,975 — Options granted (2,587,516 ) 2,587,516 1.00 Options exercised — (20,539 ) 0.69 — — Options cancelled and forfeited 27,354 (27,354 ) 0.65 Outstanding - 491,003 3,697,392 $ 0.92 8.7 $ 231 Vested and expected to vest - 3,697,392 $ 0.92 8.7 $ 231 Exercisable - 867,272 $ 0.70 6.8 $ 202 Number of Weighted- Number of Shares Average Shares Underlying Weighted- Remaining Aggregate Available Outstanding Average Exercise Contractual Intrinsic for Grant Options Price per Share Term (in years) Value Outstanding - 2,818,286 903,700 $ 0.69 7.0 $ 138 Options granted (188,920 ) 188,920 0.82 Options exercised — — — — — Options cancelled and forfeited 30,641 (30,641 ) 0.82 Outstanding - 2,660,007 1,061,979 $ 0.71 7.9 $ 135 Vested and expected to vest - 1,061,979 $ 0.71 7.9 $ 135 Exercisable - 751,267 $ 0.68 7.7 $ 112 The weighted-average grant date fair value per share of stock options granted for the three months ended September 30, 2021 and 2020 was $0.93 and $0.47, respectively. The total grant date fair value of stock options vested was not material during the three and nine months ended September 30, 2021 and 2020. Valuation The Company records stock-based compensation expense for stock options based on the estimated fair value of stock options on the date of the grant using the Black-Scholes option-pricing model. The absence of a public market for the Company’s common stock requires the Company’s board of directors to estimate the fair value of its common stock for purposes of granting options and for determining stock-based compensation expense by considering several objective and subjective factors, including contemporaneous third-party valuations, actual and forecasted operating and financial results, market conditions and performance of comparable publicly traded companies, developments and milestones in the Company, the rights and preferences of redeemable convertible preferred stock and common, and transactions involving the Company’s stock. The fair value of the Company’s common stock was determined in accordance with applicable elements of the American Institute of Certified Public Accountants guide, Valuation of Privately Held Company Equity Securities Issued as Compensation. The estimated grant date fair values of the employee stock options were calculated using the Black-Scholes option-pricing models based on the following assumptions: Three Months Ended Nine months Ended September 30, 2021 2020 2021 2020 (Unaudited) (Unaudited) (Unaudited) (Unaudited) Expected term (in years) 6.08 6.08 6.08 2.50 to 6.08 Risk-free interest rate 0.85% to 0.98% 0.37% 0.64% to 1.13% 0.26% to 0.94% Expected volatility 69.28% to 69.31% 64.43% 67.99% to 69.33% 61.76 to 68.43% Expected dividend rate — — — — Expected volatility - Expected term - time-to-vesting Expected dividend rate - Risk-free interest rate - Stock-based Compensation Expense The Company’s stock-based compensation included in its condensed consolidated statements of operations and comprehensive loss was as follows (in thousands): Three Months Ended Nine months Ended 2021 2020 2021 2020 (Unaudited) (Unaudited) (Unaudited) (Unaudited) Research and development $ 34 $ 6 $ 89 $ 66 General and administrative 123 14 254 68 Total stock-based compensation $ 157 $ 20 $ 343 $ 134 No income tax benefit was recognized for this compensation expense in the condensed consolidated statements of operations and comprehensive loss, as the Company does not anticipate realizing any such benefit in the future. As of September 30, 2021 and 2020, there was $1.3 million and $0.1 million, respectively, of total unrecognized stock-based compensation cost related to unvested stock options, which the Company expects to recognize over an estimated weighted-average period of 3.3 years and 1.8 years, respectively.	11. Stock-Based Compensation On May 3, 2013, the Company established the 2013 Share Incentive Plan (the “2013 Plan”) in which 3,721,986 shares of common stock were reserved for the issuance of incentive stock options (“ISOs”) and non-statutory . On March 30, 2021, the Company amended the 2018 Plan with the 2021 Share Incentive Plan (the “2021 Plan”) and the total shares reserved for future issuance under the 2021 Plan were increased by 486,975 shares. Upon approval of the 2021 Plan, any shares that, as of the date of stockholder approval, were reserved but not issued pursuant to any awards granted under the Company’s 2018 Plan were rolled into the 2021 Plan. In addition, any shares subject to stock options or similar awards granted under the 2018 Plan that expire or otherwise terminate without having been exercised in full and shares issued pursuant to awards granted under the 2018 Plan that are forfeited or repurchased by the Company shall roll into the 2021 Plan. The 2021 Plan provides for the discretionary grant of incentive stock options, non-statutory Option awards are granted with an exercise price equal to the fair value of the Company’s common stock at the date of grant. Generally, options granted will vest 25% upon completion of one year of service and 1/48 per month thereafter; however, in certain instances options have been granted with immediate vesting. Options under all plans generally expire 10 years from the date of grant. The following table summarizes the activity under the Company’s stock option plan (in thousands, except per share data and contractual term): Weighted- Weighted- Number of Number of Average Average Shares Shares Underlying Exercise Remaining Aggregate Available for Outstanding Price per Contractual Intrinsic Grant Options Share Term (in years) Value Outstanding - 2,982,792 779,166 $ 0.44 7.0 $ 336 Options granted (537,200 ) 537,200 0.87 Options exercised — (40,000 ) 0.41 — 18 Options cancelled and forfeited 372,694 (372,666 ) 0.45 Outstanding - 2,818,286 903,700 $ 0.69 8.4 $ 138 Options granted (287,720 ) 287,720 0.81 Options exercised — — — — — Options cancelled and forfeited 33,624 (33,651 ) 0.75 Outstanding - 2,564,190 1,157,769 $ 0.72 7.8 $ 243 Vested and expected to vest - 903,700 $ 0.69 8.4 $ 138 Exercisable - 260,205 $ 0.45 7.0 $ 94 Vested and expected to vest - 1,157,769 $ 0.72 7.8 $ 243 Exercisable - 701,122 $ 0.66 7.4 $ 187 The weighted-average grant date fair value per share of stock options granted for the years ended December 31, 2020 and 2019 was $0.48 and $0.51, respectively. The total grant date fair value of stock options vested was $204,000 and $47,000 during the years ended December 31, 2020 and 2019, respectively. Valuation The Company records stock-based compensation expense for stock options based on the estimated fair value of stock options on the date of the grant using the Black-Scholes option-pricing model. The absence of a public market for the Company’s common stock requires the Company’s board of directors to estimate the fair value of its common stock for purposes of granting options and for determining stock-based compensation expense by considering several objective and subjective factors, including contemporaneous third-party valuations, actual and forecasted operating and financial results, market conditions and performance of comparable publicly traded companies, developments and milestones in the Company, the rights and preferences of redeemable convertible preferred stock and common, and transactions involving the Company’s stock. The fair value of the Company’s common stock was determined in accordance with applicable elements of the American Institute of Certified Public Accountants guide, Valuation of Privately Held Company Equity Securities Issued as Compensation. The estimated grant date fair values of the employee stock options were calculated using the Black-Scholes option-pricing models based on the following assumptions: Year Ended December 31, 2020 2019 Expected term (in years) 5.0 - 6.1 - Risk-free interest rate 0.4% to 0.9% 1.6% to 2.5% Expected volatility 61.8% to 67.5% 61.8% to 62.7% Expected dividend rate 0% 0% Expected volatility Expected term time-to-vesting Expected dividend rate Risk-free interest rate Stock-based Compensation Expense The Company’s stock-based compensation included in its consolidated statements of operations and comprehensive loss was as follows (in thousands): Year Ended December 31, 2020 2019 Research and development $ 72 $ 37 General and administrative 82 86 Total stock-based compensation $ 154 $ 123 No income tax benefit was recognized for this compensation expense in the consolidated statements of operations and comprehensive loss, as the Company does not anticipate realizing any such benefit in the future. As of December 31, 2020, there was $0.2 million of total unrecognized stock-based compensation cost related to unvested stock options, which the Company expects to recognize over an estimated weighted-average period of 2.5 years.

Class A Ordinary Shares Subject

Class A Ordinary Shares Subject to Possible Redemption	6 Months Ended	9 Months Ended
	Jan. 11, 2021	Sep. 30, 2021
Ivanhoe Capital Acquisition Corp [Member]
Class A Ordinary Shares Subject to Possible Redemption	NOTE 8. CLASS A ORDINARY SHARES SUBJECT TO POSSIBLE REDEMPTION The Company’s Class A ordinary shares feature certain redemption rights that are considered to be outside of the Company’s control and subject to the occurrence of future events. The Company is authorized to issue shares of Class A ordinary shares with a par value of $ per share. Holders of the Company’s Class A ordinary shares are entitled to vote for each ordinary share. As of January 11, 2021, there were shares of Class A ordinary shares outstanding, which were all subject to possible redemption and are classified outside of permanent equity in the balance sheet. The Class A ordinary shares subject to possible redemption reflected on the balance sheet is reconciled on the following table: Gross proceeds from Initial Public Offering $ 276,000,000 Less: Fair value of Public Warrants at issuance (14,628,000 ) Offering costs allocated to Class A ordinary shares subject to possible redemption (14,971,596 ) Plus: Accretion on Class A ordinary shares subject to possible redemption amount 29,599,596 Class A ordinary shares subject to possible redemption $ 276,000,000	Note 8 — Class A Ordinary Shares Subject to Possible Redemption The Company’s Class A ordinary shares feature certain redemption rights that are considered to be outside of the Company’s control and subject to the occurrence of future events. The Company is authorized to issue 200,000,000 shares of Class A ordinary shares with a par value of $0.0001 per share. Holders of the Company’s Class A ordinary shares are entitled to one vote for each ordinary share. As of September 30, 2021, there were 27,600,000 shares of Class A ordinary shares outstanding, which were all subject to possible redemption and are classified outside of permanent equity in the unaudited condensed consolidated balance sheet. The Class A ordinary shares subject to possible redemption reflected on the unaudited condensed consolidated balance sheet is reconciled on the following table: Gross proceeds from Initial Public Offering $ 276,000,000 Less: Fair value of Public Warrants at issuance (14,628,000 ) Offering costs allocated to Class A ordinary shares subject to possible redemption (14,971,596 ) Plus: Accretion on Class A ordinary shares subject to possible redemption amount 29,599,596 Class A ordinary shares subject to possible redemption $ 276,000,000

Shareholders' Equity (Deficit)

Shareholders' Equity (Deficit)	6 Months Ended		9 Months Ended	12 Months Ended
	Jan. 11, 2021	Dec. 31, 2020	Sep. 30, 2021	Dec. 31, 2020
Shareholders' Equity (Deficit)			10. Stockholders’ Equity As of September 30, 2021, the Company has authorized the issuance of up to 45,000,000 shares of common stock, $0.000001 par value, and 36,064,095 shares of preferred stock, $0.000001 par value. Holders of the common stock are entitled to dividends when, as, and if, declared by the Company’s Board of Directors, subject to the rights of the holders of all classes of stock outstanding having priority rights to dividends. As of September 30, 2021, the Company had not declared any dividends. The holder of each share of common stock is entitled to one vote. The Company has the following shares of common stock available for future issuance on an as-if September 30, December 31, 2021 2020 (Unaudited) Redeemable convertible preferred stock 36,064,095 29,496,153 Common stock options outstanding 3,697,392 3,718,568 Shares reserved for issuance under the Share Incentive Plan 491,003 3,418 40,252,490 33,218,139	12. Stockholders’ Equity As of December 31, 2020, the Company has authorized the issuance of up to 45,000,000 shares of common stock, $0.000001 par value, and 29,496,153 shares of preferred stock, $0.000001 par value. Holders of the common stock are entitled to dividends when, as, and if, declared by the Company’s Board of Directors, subject to the rights of the holders of all classes of stock outstanding having priority rights to dividends. As of December 31, 2020, the Company had not declared any dividends. The holder of each share of common stock is entitled to one vote. The Company has the following shares of common stock available for future issuance on an as-if December 31, 2020 2019 Redeemable convertible preferred stock 29,496,153 29,496,153 Common stock options outstanding 1,157,796 903,700 Shares reserved for issuance under the 2018 Plan 2,564,190 2,818,286 33,218,139 33,218,139
Ivanhoe Capital Acquisition Corp [Member]
Shareholders' Equity (Deficit)	NOTE 9. SHAREHOLDERS’ DEFICIT Preference Shares — Class A Ordinary Shares — Class B Ordinary Shares — Ordinary shareholders of record are entitled to one vote for each share held on all matters to be voted on by shareholders. Except as described below, holders of Class A ordinary shares and holders of Class B ordinary shares will vote together as a single class on all matters submitted to a vote of the shareholders except as required by law. In a vote to continue the company in jurisdiction outside the Cayman Islands (which required the approval of at least two thirds of the votes of all ordinary shares), holders of the Founder Shares will have ten votes for every Founder Share and holders of the Class A ordinary shares will have one vote for every Class A ordinary share. The Class B ordinary shares will automatically convert into Class A ordinary shares at the time of the consummation of the initial Business Combination on a one-for-one sub-divisions, Class A ordinary shares outstanding after such conversion (after giving effect to any redemptions of Class A ordinary shares by Public Shareholders), including the total number of Class A ordinary shares issued, or deemed issued or issuable upon conversion or exercise of any equity-linked securities or rights issued or deemed issued, by the Company in connection with or in relation to the consummation of the initial Business Combination, excluding any Class A ordinary shares or equity-linked securities exercisable for or convertible into Class A ordinary shares issued, or to be issued, to any seller in the initial Business Combination and any Private Placement Warrants issued to the Sponsor, officers or directors upon conversion of working capital loans; provided that such conversion of Founder Shares will never occur on a less than one-for-one	NOTE 7. SHAREHOLDERS’ EQUITY Preference Shares Class A Ordinary Shares Class B Ordinary Shares Ordinary shareholders of record are entitled to one vote for each share held on all matters to be voted on by shareholders. Except as described below, holders of Class A ordinary shares and holders of Class B ordinary shares will vote together as a single class on all matters submitted to a vote of the shareholders except as required by law. In a vote to continue the company in jurisdiction outside the Cayman Islands (which required the approval of at least two thirds of the votes of all ordinary shares), holders of the Founder Shares will have ten votes for every Founder Share and holders of the Class A ordinary shares will have one vote for every Class A ordinary share. The Class B ordinary shares will automatically convert into Class A ordinary shares at the time of the consummation of the initial Business Combination on a one-for-one sub-divisions, issued or issuable upon conversion or exercise of any equity-linked securities or rights issued or deemed issued, by the Company in connection with or in relation to the consummation of the initial Business Combination, excluding any Class A ordinary shares or equity-linked securities exercisable for or convertible into Class A ordinary shares issued, or to be issued, to any seller in the initial Business Combination and any Private Placement Warrants issued to the Sponsor, officers or directors upon conversion of working capital loans; provided that such conversion of Founder Shares will never occur on a less than one-for-one Warrants The warrants have an exercise price of $11.50 per share, subject to adjustments, and will expire five years after the completion of a Business Combination or earlier upon redemption or liquidation. In addition, if (x) the Company issues additional Class A ordinary shares or equity-linked securities for capital raising purposes in connection with the closing of the initial Business Combination at an issue price or effective issue price of less than $9.20 per Class A ordinary share (with such issue price or effective issue price to be determined in good faith by the board of directors and, in the case of any such issuance to the Initial Shareholders or their affiliates, without taking into account any Founder Shares held by the Initial Shareholders or such affiliates, as applicable, prior to such issuance) (the “Newly Issued Price”), (y) the aggregate gross proceeds from such issuances represent more than 60% of the total equity proceeds, and interest thereon, available for the funding of the initial Business Combination on the date of the consummation of the initial Business Combination (net of redemptions), and (z) the volume weighted average trading price of Class A ordinary shares during the 10-trading The Private Placement Warrants are identical to the Public Warrants underlying the Units sold in the Initial Public Offering, except that the Private Placement Warrants and the Class A ordinary shares issuable upon exercise of the Private Placement Warrants will not be transferable, assignable or salable until 30 days after the completion of a Business Combination, subject to certain limited exceptions. Additionally, the Private Placement Warrants will be non-redeemable Redemption of warrants when the price per Class A ordinary share equals or exceeds $18.00: Once the warrants become exercisable, the Company may call the outstanding warrants for redemption (except as described herein with respect to the Private Placement Warrants): • in whole and not in party’ • at a price of $0.01 per warrant • upon a minimum of 30 days’ prior written notice of redemption to each warrant holder; and • if, and only if, the last reported sale price (the “closing price”) of Class A ordinary shares equals or exceeds $18.00 per share (as adjusted) for any 20 trading days within a 30-trading The Company will not redeem the warrants as described above unless a registration statement under the Securities Act covering the Class A ordinary shares issuable upon exercise of the warrants is then effective and a current prospectus relating to those Class A ordinary shares is available throughout the 30-day Redemption of warrants when the price per Class A ordinary share equals or exceeds $10.00 : Once the warrants become exercisable, the Company may redeem the outstanding warrants: • in whole and not in part; • at $0.10 per warrant upon a minimum of 30 days’ prior written notice of redemption provided that holders will be able to exercise their warrants on a cashless basis prior to redemption and receive that number of Class A ordinary shares to be determined by reference to an agreed table based on the redemption date and the “fair market value” of Class A ordinary shares; and • if, and only if, the closing price of Class A ordinary shares equals or exceeds $10.00 per share (as adjusted) for any 20 trading days within the 30-trading The “fair market value” of Class A ordinary shares for the above purpose shall mean the volume-weighted average price of the Class A ordinary shares for the 10 trading days immediately following the date on which the notice of redemption is sent to the holders of warrants. In no event will the warrants be exercisable in connection with this redemption feature for more than 0.361 Class A ordinary shares per warrant (subject to adjustment). In no event will the Company be required to net cash settle any warrant. If the Company is unable to complete a Business Combination within the Combination Period and the Company liquidates the funds held in the Trust Account, holders of warrants will not receive any of such funds with respect to their warrants, nor will they receive any distribution from the Company’s assets held outside of the Trust Account with the respect to such warrants. Accordingly, the warrants may expire worthless.	Note 9 — Shareholders’ Equity (Deficit) Preference Shares — Class A Ordinary Shares — Class B Ordinary Shares — Ordinary shareholders of record are entitled to one vote for each share held on all matters to be voted on by shareholders. Except as described below, holders of Class A ordinary shares and holders of Class B ordinary shares will vote together as a single class on all matters submitted to a vote of the shareholders except as required by law. In a vote to continue the company in jurisdiction outside the Cayman Islands (which required the approval of at least two thirds of the votes of all ordinary shares), holders of the Founder Shares will have ten votes for every Founder Share and holders of the Class A ordinary shares will have one vote for every Class A ordinary share. The Class B ordinary shares will automatically convert into Class A ordinary shares at the time of the consummation of the initial Business Combination on a one-for-one sub-divisions, Class A ordinary shares outstanding after such conversion (after giving effect to any redemptions of Class A ordinary shares by Public Shareholders), including the total number of Class A ordinary shares issued, or deemed issued or issuable upon conversion or exercise of any equity-linked securities or rights issued or deemed issued, by the Company in connection with or in relation to the consummation of the initial Business Combination, excluding any Class A ordinary shares or equity-linked securities exercisable for or convertible into Class A ordinary shares issued, or to be issued, to any seller in the initial Business Combination and any Private Placement Warrants issued to the Sponsor, officers or directors upon conversion of working capital loans; provided that such conversion of Founder Shares will never occur on a less than one-for-one

Derivative Warrant Liabilities

Derivative Warrant Liabilities	6 Months Ended	9 Months Ended
	Jan. 11, 2021	Sep. 30, 2021
Ivanhoe Capital Acquisition Corp [Member]
Derivative Warrant Liabilities	NOTE 10. DERIVATIVE WARRANT LIABILITIES Public Warrants may only be exercised for a whole number of shares. No fractional Public Warrants will be issued upon separation of the Units and only whole Public Warrants will trade. The Public Warrants will become exercisable on the later of (a) 30 days after the completion of a Business Combination or (b) 12 months from the closing of the Initial Public Offering; provided in each case that the Company has an effective registration statement under the Securities Act covering the Class A ordinary shares issuable upon exercise of the Public Warrants and a current prospectus relating to them is available and such shares are registered, qualified or exempt from registration under the securities, or blue sky, laws of the state of residence of the holder (or the Company permit holders to exercise their warrants on a cashless basis under certain circumstances). The Company has agreed that as soon as practicable, but in no event later than 15 business days after the closing of the initial Business Combination, the Company will use commercially reasonable efforts to file with the SEC and have an effective registration statement covering the Class A ordinary shares issuable upon exercise of the warrants and to maintain a current prospectus relating to those Class A ordinary shares until the warrants expire or are redeemed, as specified in the warrant agreement. If a registration statement covering the Class A ordinary shares issuable upon exercise of the warrants is not effective by the 60th day after the closing of the initial Business Combination, warrant holders may, until such time as there is an effective registration statement and during any period when the Company will have failed to maintain an effective registration statement, exercise warrants on a “cashless basis” in accordance with Section 3(a)(9) of the Securities Act or another exemption. Notwithstanding the above, if the Class A ordinary shares are at the time of any exercise of a warrant not listed on a national securities exchange such that they satisfy the def The warrants have an exercise price of $11.50 per share, subject to adjustments, and will expire five years after the completion of a Business Combination or earlier upon redemption or liquidation. In addition, if (x) the Company issues additional Class A ordinary shares or equity-linked securities for capital raising purposes in connection with the closing of the initial Business Combination at an issue price or effective issue price of less than $9.20 per Class A ordinary share (with such issue price or effective issue price to be determined in good faith by the board of directors and, in the case of any such issuance to the Initial Shareholders or their affiliates, without taking into account any Founder Shares held by the Initial Shareholders or such affiliates, as applicable, prior to such issuance) (the “Newly Issued Price”), (y) the aggregate gross proceeds from such issuances represent more than 60% of the total equity proceeds, and interest thereon, available for the funding of the initial Business Combination on the date of the consummation of the initial Business Combination (net of redemptions), and (z) the volume weighted average trading price of Class A ordinary shares during the 10-trading period starting The Private Placement Warrants are identical to the Public Warrants underlying the Units sold in the Initial Public Offering, except that the Private Placement Warrants and the Class A ordinary shares issuable upon exercise of the Private Placement Warrants will not be transferable, assignable or salable until 30 days after the completion of a Business Combination, subject to certain limited exceptions. Additionally, the Private Placement Warrants will be non-redeemable Redemption of warrants when the price per Class A ordinary share equals or exceeds $18.00: • in whole and not in part; • at a price of $0.01 per warrant; • upon a minimum of 30 days’ prior written notice of redemption to each warrant holder; and • if, and only if, the last reported sale price (the “Closing Price”) of Class A ordinary shares equals or exceeds $18.00 per share (as adjusted) for any 20 trading days within a 30-trading The Company will not redeem the warrants as described above unless a registration statement under the Securities Act covering the Class A ordinary shares issuable upon exercise of the warrants is then effective and a current prospectus relating to those Class A ordinary shares is available throughout the 30-day Redemption of warrants when the price per Class A ordinary share equals or exceeds $10.00: • in whole and not in part; • at $0.10 per warrant upon a minimum of 30 days’ prior written notice of redemption provided that holders will be able to exercise their warrants on a cashless basis prior to redemption and receive that number of Class A ordinary shares to be determined by reference to an agreed table based on the redemption date and the “fair market value” of Class A ordinary shares; and • if, and only if, the Closing Price of Class A ordinary shares equals or exceeds $10.00 per share (as adjusted) for any 20 trading days within the 30-trading The “fair market value” of Class A In no event will the Company be required to net cash settle any warrant. If the Company is unable to complete a Business Combination within the Combination Period and the Company liquidates the funds held in the Trust Account, holders of warrants will not receive any of such funds with respect to their warrants, nor will they receive any distribution from the Company’s assets held outside of the Trust Account with the respect to such warrants. Accordingly, the warrants may expire worthless.	Note 7 — Derivative Warrant Liabilities As of September 30, 2021, the Company had 9,200,000 Public Warrants and 5,013,333 Private Warrants outstanding. There were no warrants outstanding as of December 31, 2020. Public Warrants may only be exercised for a whole number of shares. No fractional Public Warrants will be issued upon separation of the Units and only whole Public Warrants will trade. The Public Warrants will become exercisable on the later of (a) 30 days after the completion of a Business Combination or (b) 12 months from the closing of the Initial Public Offering; provided in each case that the Company has an effective registration statement under the Securities Act covering the Class A ordinary shares issuable upon exercise of the Public Warrants and a current prospectus relating to them is available and such shares are registered, qualified or exempt from registration under the securities, or blue sky, laws of the state of residence of the holder (or the Company permit holders to exercise their warrants on a cashless basis under certain circumstances). The Company has agreed that as soon as practicable, but in no event later than 15 business days after the closing of the initial Business Combination, the Company will use commercially reasonable efforts to file with the SEC and have an effective registration statement covering the Class A ordinary shares issuable upon exercise of the warrants and to maintain a current prospectus relating to those Class A ordinary shares until the warrants expire or are redeemed, as specified in the warrant agreement. If a registration statement covering the Class A ordinary shares issuable upon exercise of the warrants is not effective by the 60th day after the closing of the initial Business Combination, warrant holders may, until such time as there is an effective registration statement and during any period when the Company will have failed to maintain an effective registration statement, exercise warrants on a “cashless basis” in accordance with Section 3(a)(9) of the Securities Act or another exemption. Notwithstanding the above, if the Class A ordinary shares are at the time of any exercise of a warrant not listed on a national securities exchange such that they satisfy the definition of a “covered security” under Section 18(b)(1) of the Securities Act, the Company may, at its option, require holders of Public Warrants who exercise their warrants to do so on a “cashless basis” and, in the event the Company so elects, the Company will not be required to file or maintain in effect a registration statement, and in the event the Company does not so elect, it will use commercially reasonable efforts to register or qualify the shares under applicable blue sky laws to the extent an exemption is not available. The warrants have an exercise price of $11.50 per share, subject to adjustments, and will expire five years after the completion of a Business Combination or earlier upon redemption or liquidation. In addition, if (x) the Company issues additional Class A ordinary shares or equity-linked securities for capital raising purposes in connection with the closing of the initial Business Combination at an issue price or effective issue price of less than $9.20 per Class A ordinary share (with such issue price or effective issue price to be determined in good faith by the board of directors and, in the case of any such issuance to the Initial Shareholders or their affiliates, without taking into account any Founder Shares held by the Initial Shareholders or such affiliates, as applicable, prior to such issuance) (the “Newly Issued Price”), (y) the aggregate gross proceeds from such issuances represent more than 60% of the total equity proceeds, and interest thereon, available for the funding of the initial Business Combination on the date of the consummation of the initial Business Combination (net of redemptions), and (z) the volume weighted average trading price of Class A ordinary shares during the 10-trading The Private Placement Warrants are identical to the Public Warrants underlying the Units sold in the Initial Public Offering, except that the Private Placement Warrants and the Class A ordinary shares issuable upon exercise of the Private Placement Warrants will not be transferable, assignable or salable until 30 days after the completion of a Business Combination, subject to certain limited exceptions. Additionally, the Private Placement Warrants will be non-redeemable Redemption of warrants when the price per Class A ordinary share equals or exceeds $ 18.00 Once the warrants become exercisable, the Company may call the outstanding warrants for redemption (except as described herein with respect to the Private Placement Warrants): • in whole and not in part; • at a price of $0.01 per warrant; • upon a minimum of 30 days’ prior written notice of redemption to each warrant holder; and • if, and only if, the last reported sale price (the “closing price”) of Class A ordinary shares equals or exceeds $18.00 per share (as adjusted) for any 20 trading days within a 30-trading The Company will not redeem the warrants as described above unless a registration statement under the Securities Act covering the Class A ordinary shares issuable upon exercise of the warrants is then effective and a current prospectus relating to those Class A ordinary shares is available throughout the 30-day Redemption of warrants when the price per Class A ordinary share equals or exceeds $10.00: Once the warrants become exercisable, the Company may redeem the outstanding warrants: • in whole and not in part; • at $0.10 per warrant upon a minimum of 30 days’ prior written notice of redemption provided that holders will be able to exercise their warrants on a cashless basis prior to redemption and receive that number of Class A ordinary shares to be determined by reference to an agreed table based on the redemption date and the “fair market value” of Class A ordinary shares; and • if, and only if, the closing price of Class A ordinary shares equals or exceeds $10.00 per share (as adjusted) for any 20 trading days within the 30-trading The “fair market value” of Class A ordinary shares for the above purpose shall mean the volume-weighted average price of the Class A ordinary shares for the 10 trading days immediately following the date on which the notice of redemption is sent to the holders of warrants. In no event will the warrants be exercisable in connection with this redemption feature for more than 0.361 Class A ordinary shares per warrant (subject to adjustment). If the Company is unable to complete a Business Combination within the Combination Period and the Company liquidates the funds held in the Trust Account, holders of warrants will not receive any of such funds with respect to their warrants, nor will they receive any distribution from the Company’s assets held outside of the Trust Account with the respect to such warrants. Accordingly, the warrants may expire worthless.

Income Taxes

Income Taxes	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	9. Income Taxes The effective tax rate was (0.04)% and 0 % for the three months ended September 30, 2021 and 2020, respectively. The effective tax rate was for the nine months ended September 30, 2021 and 2020, respectively. The difference between the provision for income taxes and the income tax determined by applying the statutory federal income tax rate of % principally results from losses generated in the U.S. where no benefit was recorded because the Company had fully reserved its deferred tax assets as of September 30, 2021 and December 31, 2020 and the recording of uncertain tax positions and interest expense. The Company’s deferred tax assets principally result from U.S. net operating loss carryforwards and research credits. Utilization of these attributes is dependent upon future levels of taxable income and may be subject to annual limitation due to the “change in ownership provisions” under Section 382 of the Internal Revenue Code. Such limitations may result in the expiration of these attributes before their utilization. The Company is evaluating the impact of the equity transactions that have occurred during the nine months ended September 30, 2021, however it does not believe there will be a material impact to the attributes. During the nine months ended September 30, 2021, there were no significant changes to the total amount of unrecognized tax benefits.	13. Income Taxes The following table presents domestic and foreign components of income (loss) before income taxes (in thousands): December 31, 2020 2019 US $ (9,696 ) $ (12,672 ) Foreign (4,186 ) (1,922 ) $ (13,882 ) $ (14,594 ) A summary of the income tax provision is as follows (in thousands): December 31, 2020 2019 Current: Federal $ — $ — State 1 1 Foreign 6 107 7 108 Deferred: Federal — — State — — Foreign — — $ 7 $ 108 The reconciliation of the federal statutory income tax rate of 21% to the Company’s effective income tax rate is as follows (in percentage): December 31, 2020 2019 Federal statutory income tax rate 21.0 % 21.0 % Foreign Tax (0.1 )% (0.7 )% Foreign income taxed at non-US (0.2 )% (0.0 )% Other permanent items (0.9 )% (1.1 )% Research and development tax credits 2.2 % 3.0 % Unrecognized tax benefits (0.7 )% (0.7 )% Increase in Valuation Allowance (21.7 )% (21.8 )% Others 0.3 % (0.4 )% (0.1 )% (0.7 )% As discussed in Note 1, SES Holdings Pte. Ltd. is a Singapore private limited company and was formed in November 2018. As a result of the reorganization the Company undertook in 2018, SES Holdings Pte. Ltd. is also treated as a U.S. taxpayer for U.S. Federal income tax purposes in accordance with Internal Revenue Code Section 7874. SES Holdings Pte. Ltd. is the parent of the U.S. Federal consolidated income tax group. Significant components of the Company’s net deferred tax assets as of December 31, 2020 and 2019, are as follows (in thousands): December 31, 2020 2019 Deferred tax assets: Net operating losses $ 12,033 $ 9,142 Research and development tax credits 1,079 709 Accruals and Reserves 624 612 Stock-based compensation 93 65 Other 3 — Gross deferred tax assets 13,832 10,528 Valuation Allowance (13,711 ) (10,276 ) Total deferred tax assets 121 252 Deferred tax liabilities: Fixed Assets (121 ) (252 ) Total deferred tax liabilities (121 ) (252 ) Total net deferred tax assets $ — $ — Recognition of deferred tax assets is appropriate when r e As of December 31, 2020, the Company had Federal net operating loss carryforward of approximately $45.7 million, of which $9.2 million is for pre-2018 million is for pre-2018 pre-2018 As of December 31, 2020, the Company had Federal research credit carryforward of approximately $0.9 million, which begins to expire in 2033, and Massachusetts research credit carryforward of approximately $0.8 million, which begins to expire in 2030. As of December 31, 2019, the Company had Federal research credit carryforward of approximately $0.6 million, which begins to expire in 2033, and Massachusetts research credit carryforward of approximately $0.6 million, which begins to expire in 2030. The utilization of the Company’s net operating losses and R&D tax credit carryforwards may be subject to a substantial annual limitation due to the “change in ownership” provisions under Section 382 of the Internal Revenue Code, and similar state provisions. An “ownership change” is generally defined as a greater than 50 percent change (by value) in its equity ownership over a three-year period. The annual limitation may result in the expiration of the net operating loss carryforwards before their utilization. Through December 31, 2018, the Company had completed several financings since its inception, and performed the related analysis which concluded that changes in ownership had occurred, as defined by Sections 382 and 383 of the Internal Revenue Code. Based on the Section 382 analysis, the annual limitation to apply to the pre-2018 The Company is subject to income taxes in the U.S. Federal, state, and various foreign jurisdictions. Tax regulations within each jurisdiction are subject to the interpretation of the related tax laws and regulations and require significant judgment to apply. The Company’s tax years remain open for examination within the U.S. for all years, until such time as the net operating losses are initially utilized. The Company’s tax years remain open for examination by foreign authorities beginning with the tax year ended December 31, 2018. The Company records unrecognized tax benefits in accordance with ASC 740-10, Income Taxes ASC 740-10 de-recognition, A reconciliation of the beginning and ending balances of unrecognized tax benefits is as follows (in thousands): December 31, 2020 2019 Beginning of the year $ 707 $ — Increase - 760 600 Increase - — 107 End of the year $ 1,467 $ 707 As of December 31, 2020 and 2019, the total amount of unrecognized tax benefits was $1.5 million and $0.7 million which would affect income tax expense, if recognized, after consideration of any valuation allowance. The Company does not expect the unrecognized tax benefits to change significantly over the next 12 months. The Company includes interest and penalties related to unrecognized tax benefits within the benefit from (provision for) income taxes. As of the years ended December 31, 2020 and 2019, the total amount of gross interest accrued in each year was not material.

Net Loss per Share

Net Loss per Share	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net Loss per Share	11. Net Loss per Share The following table sets forth the computation of basic and diluted net loss per share (in thousands, except share and per share amounts): Three Months Ended Nine Months Ended 2021 2020 2021 2020 (Unaudited) (Unaudited) (Unaudited) (Unaudited) Numerator: Net loss $ (7,995 ) $ (3,312 ) $ (18,219 ) $ (10,043 ) Denominator: Weighted-average shares of common stock outstanding 10,258,463 10,245,074 10,249,586 10,245,074 Net loss per common share - $ (0.78 ) $ (0.32 ) $ (1.78 ) $ (0.98 ) The following outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share for the periods presented because including them would have had an anti-dilutive effect: As of September 30, 2021 2020 (Unaudited) (Unaudited) Redeemable convertible preferred stock 36,064,095 29,496,153 Options to purchase common stock 3,697,392 1,061,979 Total 39,761,487 30,558,132	14. Net Loss per Share The following table sets forth the computation of basic and diluted net loss per share (in thousands, except share and per share data): Year Ended December 31, 2020 2019 Numerator: Net loss $ (13,889 ) $ (14,702 ) Denominator: Weighted-average shares of common stock outstanding 10,245,074 10,223,375 Net loss per common share - $ (1.36 ) $ (1.44 ) The following outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share for the periods presented because including them would have had an anti-dilutive effect: Year Ended December 31, 2020 2019 Redeemable convertible preferred stock 29,496,153 29,496,153 Options to purchase common stock 1,157,796 903,700 Total 30,653,949 30,399,853

Employee Benefit Plan

Employee Benefit Plan	12 Months Ended
	Dec. 31, 2020
Retirement Benefits [Abstract]
Employee Benefit Plan	16. Employee benefit plan The Company offers a defined contribution retirement savings plan under Section 401(k) of the Internal Revenue Code. This plan covers employees who meet minimum age and service requirements and allows participants to defer a portion of their annual compensation on a pre-tax

Partnerships

Partnerships	9 Months Ended
	Sep. 30, 2021
Partnerships [Abstract]
Partnerships	13. Partnerships In December 2020, the Company established a partnership with Hyundai Motor Company (“Hyundai”) when it entered into an arrangement to jointly research and develop (“R&D”) li-metal Further, in May 2021, the Company executed a Joint Development Agreements (“JDA”) with Hyundai to jointly develop an A-Sample In February 2021, the Company executed a JDA with GM Global Technology Operations LLC (“GM Technology”) and General Motors Holdings LLC (“GM Holdings”), to jointly R&D an A-Sample build-out be required to The JDAs with Hyundai and GM do not represent commitments by these manufacturers to purchase the Company’s Li-Metal

Segment and Geographic Informat

Segment and Geographic Information	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Segment and Geographic Information	15. Segment and Geographic information The Company operates as one reportable segment as described in Note 2 to the consolidated financial statements. The Company’s long-lived assets consist primarily of property and equipment and intangible assets and are attributed to the geographic location in which they are located. Long-lived assets by geographical area were as follows (in thousands): December 31, 2020 2019 Property and equipment, net: United States $ 3,700 $ 4,618 China 2,344 2,567 Total property and equipment, net 6,044 7,185 Intangible assets, net: Singapore 1,728 1,856 Total intangible assets, net 1,728 1,856 Total long-lived assets $ 7,772 $ 9,041

Subsequent Events

Subsequent Events	6 Months Ended		9 Months Ended	12 Months Ended
	Jan. 11, 2021	Dec. 31, 2020	Sep. 30, 2021	Dec. 31, 2020
Subsequent Events			14. Subsequent Events The Company evaluated subsequent events through November 11, 2021, the date these condensed consolidated financial statements were available to be issued, and concluded that no subsequent events have occurred that would require recognition in the Company’s condensed consolidated financial statements or disclosures in the notes to the condensed consolidated financial statements herein except as follows: Business Combination Agreement and PIPE Agreement On July 12, 2021, the Company entered into a business combination agreement with Ivanhoe Capital Acquisition Corp. (“Ivanhoe”), a Cayman Islands exempted company, and Wormhole Merger Sub Pte. Ltd., a Singapore private company limited by shares and a wholly owned subsidiary of Ivanhoe (“Amalgamation Sub”), pursuant to which, among other things, Amalgamation Sub will amalgamate with the Company, with the Company surviving the Business Combination as a wholly-owned subsidiary of Ivanhoe (the “Business Combination”). In connection with the Business Combination, Ivanhoe will migrate out of the Cayman Islands and domesticate as a Delaware corporation prior to the closing of the Business Combination and will change its name to “SES AI Corporation” (“New SES”). Upon the consummation of the Business Combination, the following shall occur: • the Company’s outstanding ordinary shares, excluding shares held by Dr. Qichao Hu (the Company’s founder and Chief Executive Officer) and certain entities affiliated with Dr. Hu (collectively, the “SES Founder Group”), and redeemable convertible preference shares will be cancelled and convert into the right to receive shares of Class A common stock of New SES; • the Company’s outstanding ordinary shares held by the SES Founder Group will be cancelled and convert into the right to receive shares of Class B common stock of New SES; • the Company’s outstanding and unexercised options, whether vested or unvested, will be assumed by New SES and converted into an option to acquire Class A common stock of New SES at an adjusted exercise price per-share • the Company’s restricted shares that are issued, outstanding and subject to restrictions (including vesting) immediately prior to the Effective Time, if any, will be assumed by New SES and converted into shares of restricted New Class A common stock. Additionally, Company’s shareholders and option holders will be entitled to receive 30,000,000 “Earn-out Earn-Out Earn-Out vesting. Concurrently shares of New Class A common stock at a purchase price of per-share, On October 22, 2021, Ivanhoe entered into a Subscription Agreement with an additional PIPE Investor, pursuant to which the additional PIPE Investor has agreed to subscribe for and purchase an aggregate of 7,500,000 shares of New Class A common stock at a price of shares of New Class A common stock at a purchase price of per-sh a	18. Subsequent Events The Company evaluated subsequent events through August 10, 2021, the date these consolidated financial statements were available to be issued, and concluded that no subsequent events have occurred that would require recognition in the Company’s consolidated financial statements or disclosures in the notes to the consolidated financial statements herein except as follows: Lease Agreement In February and March 2021, the Company amended the lease agreement for its office space in Woburn, Massachusetts. Under the terms of these amendments, the Company increased its leased space and the total base rental payments increased from approximately $0.8 million to approximately $1.5 million per year. The expiration date of the amended lease coincides with the expiration date of the original lease in accordance with the terms of prior amendments, as described in Note 8 “Commitments and Contingencies”. Stock Purchase Agreements In April 2021, the Company entered into a stock purchase agreement whereby certain investors agreed to purchase $138.5 million in Series D redeemable convertible preferred stock, $0.000001 par value per share. Upon closing of the financing transaction in April 2021, the investors purchased 4,869,854 shares of Series D redeemable convertible preferred stock. In May 2021, the Company entered into a stock purchase agreement whereby an investor agreed to purchase $50.0 million in Series D plus redeemable convertible preferred stock, $0.000001 par value per share. Upon closing of the financing transaction in May 2021, the investor purchased 1,698,088 shares of Series D plus redeemable convertible preferred stock. The proceeds from the issuance of Series D and Series D plus redeemable convertible preferred stock will be used in future research and development activities and which may include the building of manufacturing prototyping lines for A-Sample pre-production 2024. Partnerships General Motors (“GM”) is an existing investor in the Company and had participated in the previous redeemable convertible preferred stock financings. In February 2021, the Company executed a Joint Development Agreement (“JDA”) with GM, valued at over $50.0 million, to jointly develop an A-Sample The Company established pre-A-Sample A-Sample Business Combination Agreement and PIPE Agreement On July 12, 2021, the Company entered into a business combination agreement with Ivanhoe Capital Acquisition Corp. (“Ivanhoe”), a Cayman Islands exempted company, and Wormhole Merger Sub Pte. Ltd., a Singapore private company limited by shares and a wholly owned subsidiary of Ivanhoe (“Amalgamation Sub”), pursuant to which, among other things, Amalgamation Sub will amalgamate with the Company, with the Company surviving the Business Combination as a wholly-owned subsidiary of Ivanhoe (the “Business Combination”). In connection with the Business Combination, Ivanhoe will migrate out of the Cayman Islands and domesticate as a Delaware corporation prior to the closing of the Business Combination and will change its name to “SES AI Corporation” (“New SES”). Upon the consummation of the Business Combination, the following shall occur: • the Company’s outstanding ordinary shares, excluding shares held by Dr. Qichao Hu (the Company’s founder and Chief Executive Officer) and certain entities affiliated with Dr. Hu (collectively, the “SES Founder Group”), and redeemable convertible preferred shares were cancelled and converted into the right to receive shares of Class A common stock of New SES; • the Company’s outstanding ordinary shares held by the SES Founder Group were cancelled and converted into the right to receive shares of our Class B common stock; • the Company’s outstanding and unexercised options, whether vested or unvested, were assumed by the Company and converted into an option to acquire our Class A common stock at an adjusted exercise price per-share • the Company’s restricted shares that were issued, outstanding and subject to restrictions (including vesting) immediately prior to the Effective Time, were assumed by the Company and converted into shares of restricted Class A common stock. Additionally, the Company’s shareholders, option holders and holders of restricted shares are entitled to receive an aggregate of up to shares of our Class A common stock (valued at $ p “Earn-out Earn-Out Earn-Out Concurrently with the execution of the business combination agreement, Ivanhoe entered into subscription agreements with certain institutional and accredited investors (the “PIPE Investors”), pursuant to which the PIPE Investors purchased, immediately prior to the consummation of the Business Combination, an aggregate of per-share, million from the Company’s existing shareholders.
Ivanhoe Capital Acquisition Corp [Member]
Subsequent Events	NOTE 12. SUBSEQUENT EVENTS On January 15, 2021, the Company repaid the Note of $500,000 in full. The Company evaluated subsequent events and transactions that occurred after the balance sheet date up to the date that the financial statement was issued (January 15, 2021). Based upon this review, the Company did not identify any subsequent events, except as noted above and for the effects of the restatement in Note 2, that would have required adjustment or disclosure in the financial statement.	NOTE 8. SUBSEQUENT EVENTS The Company evaluated subsequent events and transactions that occurred after the balance sheet date up to the date that the financial statements were issued. Other than previously described in these financial statements, the Company did not identify any other subsequent events that would have required adjustment or disclosure in the financial statements.	Note 11 — Subsequent Events The Company evaluated subsequent events and transactions that occurred up to the date of the unaudited condensed consolidated financial statements were issued. Based upon this review, the Company determined that there have been no events that have occurred that would require adjustments to the disclosures in the unaudited condensed consolidated financial statements.

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	6 Months Ended		9 Months Ended	12 Months Ended
	Jan. 11, 2021	Dec. 31, 2020	Sep. 30, 2021	Dec. 31, 2020
Basis of Presentation			Basis of Presentation The accompanying condensed consolidated financial statements include the accounts of the Company and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) as determined by the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) and pursuant to the regulations of the U.S. Securities and Exchange Commission (“SEC”). Management believes that all adjustments necessary for the fair presentation of results, consisting of normally recurring items, have been included in the unaudited condensed consolidated financial statements for the interim periods presented. All material intercompany balances and transactions have been eliminated in consolidation. During the nine months ended September 30, 2021, there were no significant changes to the Company’s significant accounting policies as described in the Company’s audited consolidated financial statements as of and for the year ended December 31, 2020, except as described below:	Basis of Presentation The accompanying consolidated financial statements include the accounts of the Company and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) as determined by the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) and pursuant to the regulations of the U.S. Securities and Exchange Commission (“SEC”). All intercompany balances and transactions have been eliminated in consolidation.
Use of Estimates				Use of estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the Company’s consolidated financial statements, as well as the revenues, if any, and expenses incurred during the reporting periods. On an ongoing basis, the Company evaluates judgments and estimates, including those related to the fair value of common stock and other assumptions used to measure stock-based compensation, and valuation of deferred tax assets and uncertain income tax positions. The Company bases its estimates on historical experience and on various other factors that the Company believes are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not apparent from other sources. Changes in estimates are reflected in reported results for the period in which they become known. Actual results could differ materially from those estimates.
Cash and Cash Equivalents				Cash and cash equivalents Cash and cash equivalents include all highly liquid investments, including money market funds with original maturity periods of three months or less when purchased. Money market funds are reported at fair value based upon quoted market prices.
Restricted cash				Restricted cash Restricted cash are money market funds held in collateral accounts that are restricted to secure letters of credit for corporate lease activity. The letters of credit are required to be maintained throughout the terms of the leases. If the date of availability or disbursement is longer than one year and the balances are maintained under an agreement that legally restricts the use of such funds, restricted cash is not included within cash and cash equivalents and is reported separately on the consolidated balance sheet. If the date of availability or disbursement is less than one-year,
Short-term investments				Short-term investments The Company considers investments with original maturities greater than three months and remaining maturities less than one year to be short-term investments. The short-term investments consist of corporate bonds and mutual funds which are classified as available-for-sale. Corporate bonds and mutual funds are carried at fair value based upon quoted market prices. Unrealized gains and losses on available-for-sale available-for-sale
Concentration of Credit Risk				Concentrations of credit risk Financial instruments that subject the Company to significant concentrations of credit risk consist of cash, cash equivalents, restricted cash and short-term investments. The Company seeks to mitigate its credit risk with respect to such concentrations by holding its deposits with large, reputable financial institutions and investing in high credit rated shorter-term instruments.
Fair Value Measurements				Fair Value Measurements Fair value is defined as an exchange price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required or permitted to be either recorded or disclosed at fair value, the Company considers the principal or most advantageous market in which it would transact, and it also considers assumptions that market participants would use when pricing the asset or liability. The Company maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value. GAAP establishes a fair value hierarchy based on the level of independent, objective evidence surrounding the inputs used to measure fair value. A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The fair value hierarchy is as follows: Level 1 Observable inputs such as quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. Level 2 Inputs other than the quoted prices in active markets that are observable either directly or indirectly. Level 3 Unobservable inputs in which there are little or no market data and which require the Company to develop its own assumptions. The carrying amounts of cash equivalents and accounts payable approximate their fair value due to the short-term nature of these assets and liabilities. The carrying amount of the note payable approximates fair value due to its short-term maturity.
Property and equipment				Property and equipment Property and equipment are stated at cost less accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets, as shown below: Estimated Useful Life (in years) Laboratory machinery and equipment 5 - Office and computer equipment 3 - Furniture and fixtures 5 Leasehold improvements Shorter of useful life or lease term The Company will periodically assess the useful lives of the assets to determine whether events or circumstances may indicate that a revision to the useful life is warranted. Maintenance and repairs that do not extend the life or improve the asset are expensed as incurred. Construction-in-process
Intangible Assets				Intangible Assets Intangible assets are stated at cost less accumulated amortization and are comprised of patents. The patents are amortized straight-line over the estimated useful life of 15
Impairment of long-lived assets				Impairment of long-lived assets The Company evaluates long-lived assets for impairment whenever events indicate that a potential impairment may have occurred. If such events arise, the Company will compare the carrying amount of the asset group comprising the long-lived assets to the estimated future undiscounted cash flows expected to be generated by the asset group. If the estimated aggregate undiscounted cash flows are less than the carrying amount of the asset group, an impairment charge is recorded as the amount by which the carrying amount of the asset group exceeds the fair value of the assets, as based on the expected discounted future cash flows attributable to those assets. Long-lived assets to be disposed of are reported at the lower of carrying amount or fair value less costs to sell. There were no impairments of long-lived assets during the years ended December 31, 2020 and 2019.
Leases				Leases Leases are evaluated and recorded as capital leases if one of the following is true at inception: (a) the present value of minimum lease payments meets or exceeds 90% of the fair value of the asset, (b) the lease term is greater than or equal to 75% of the economic life of the asset, (c) the lease arrangement contains a bargain purchase option, or (d) title to the property transfers to the Company at the end of the lease. The Company records an asset and liability for capital leases at present value of the minimum lease payments based on the incremental borrowing rate. Assets are depreciated over the useful life in accordance with the Company’s depreciation policy while rental payments and interest on the liability are accounted for using the effective interest method. Leases that are not classified as capital leases are accounted for as operating leases. For leases that contain rent abatements or escalating rent payments, the Company recognizes rent expense on a straight-line basis over the lease term, with any lease incentives amortized as a reduction of rent expense over the lease term.
Redeemable Convertible Preferred Stock				Redeemable Convertible Preferred Stock The Company records all shares of redeemable convertible preferred stock at their respective fair values less issuance costs on the dates of issuance. The redeemable convertible preferred stock is recorded outside of stockholders’ deficit because, in the event of certain liquidation events considered not solely within the Company’s control, such as a change in control event and sale of all or substantially all of the Company’s assets, the redeemable convertible preferred stock will become redeemable at the option of the holders. If it becomes probable that the shares will become redeemable, the Company will re-measure
Segment and geographic information				Segment and geographic information Operating segments are defined as components of an entity for which separate financial information is available and that is regularly reviewed by the Chief Operating Decision Maker (“CODM”) in deciding how to allocate resources to an individual segment and in assessing performance. The Company’s CODM is its Chief Executive Officer. The Company has determined that it operates in one operating and reportable segment, as the CODM reviews financial information presented on a consolidated basis for purposes of making operating decisions, allocating resources, and evaluating financial performance. All long-lived assets of the Company are located in the United States, China and Singapore (see Note 15).
Research and Development Costs				Research and development costs Research and development costs are expensed as incurred. Research and development costs consist of expenses incurred in performing research and development activities, including compensation and benefits for full-time research and development employees, materials and supplies, payments to consultants, patent related legal costs, facility costs, depreciation, and travel expenses. Payments received by the Company under agreements with partners are being recognized as a reduction to research and development expense in the consolidated statements of operations and comprehensive loss.
Stock-based compensation				Stock-based compensation The Company measures compensation expense for all stock options made to employees, directors, and non-employees The Company has only granted stock option awards with service-based vesting conditions. Accordingly, the fair value of options granted is estimated using the Black-Scholes option valuation model, which requires the Company to make assumptions and judgments about the variables used in the calculation, including the fair value of the underlying common stock, the expected term of the stock option (weighted-average period of time that the options granted are expected to be outstanding), the expected volatility of the price of the Company’s common stock, the expected risk-free interest rate and the expected dividend yield of the Company’s common stock. The Company accounts for forfeitures when they occur. Changes in the assumptions can materially affect the fair value and ultimately how much stock-based compensation expense is recognized. These inputs are subjective and generally require significant analysis and judgment to develop.
Income Taxes				Income taxes Income tax expense has been provided using the asset and liability method. Deferred tax assets and liabilities are determined based on the estimated future tax consequences attributable to differences between the financial statement carrying amounts and tax bases of existing assets and liabilities. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. Deferred tax expense or benefit is the result of changes in the deferred tax asset and liability. The Company provides a valuation allowance against net deferred tax assets if, based upon the available evidence, it is more likely than not that the deferred tax assets are not realized. In evaluating the Company’s ability to recover deferred tax assets, the Company considers all available positive and negative evidence, including historical operating results, ongoing tax planning, and forecasts of future taxable income on a jurisdiction-by-jurisdiction The Company recognizes a tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the Company’s consolidated financial statements from such positions are measured based on the largest benefit that has a greater than 50% likelihood of being realized. The Company recognizes interest and penalties associated with tax matters as part of the income tax provision and includes accrued interest and penalties with the related income tax liability within accrued expenses and other current liabilities on its consolidated balance sheets.
Other Comprehensive Loss				Other Comprehensive Loss Other Comprehensive income (loss) includes changes in the balances of items that are reported directly as a separate component of stockholders’ deficit on the consolidated balance sheets. The components of comprehensive loss are net loss and foreign currency translation adjustments. The Company does not provide for income taxes on foreign currency translation adjustments since it does not provide for taxes on the unremitted earnings of its foreign subsidiaries. The changes in accumulated other comprehensive loss are included in the Company’s consolidated statements of operations and comprehensive loss.
Net Income (Loss) Per Ordinary Share				Net loss per common share Basic and diluted net loss per share is presented in conformity with the two-class two-class
Deferred offering costs			Deferred offering costs Deferred offering costs consist of legal, accounting, and other costs incurred through the balance sheet date that are directly related to the Company becoming a publicly traded company are capitalized. The deferred offering costs will be charged to stockholders’ equity upon the completion of the proposed transaction. In the event the offering is terminated, these deferred offering costs, as well as additional expenses to be incurred, will be expensed.
Recent Accounting Pronouncements			Recent Accounting Pronouncements In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) 2016-02. right-of-use There have been no other newly issued or newly applicable accounting pronouncements that do not require adoption until a future date that have had, or are expected to have, a significant impact on the Company’s condensed consolidated financial statements.	Recent Accounting Pronouncements Adopted In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash 2016-18”). 2016-18 2016-18, beginning-of-period end-of-period In June 2018, the FASB issued ASU No. 2018-07, Compensation-Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting 2018-07”), non-employees. 2018-07 amendments amendments are effective for fiscal years beginning after December 15, 2019. The Company adopted this ASU on January 1, 2020. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement 2018-13”), 2018-13
Recent Accounting Pronouncements Not Yet Adopted				Recent Accounting Pronouncements Not Yet Adopted In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) 2016-02. right-of-use
Ivanhoe Capital Acquisition Corp [Member]
Basis of Presentation	Basis of presentation The accompanying financial statement is presented in U.S. dollars in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and pursuant to the rules and regulations of the SEC.	Basis of presentation The accompanying financial statements are presented in U.S. dollars in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and pursuant to the rules and regulations of the SEC.	Basis of Presentation The accompanying unaudited condensed consolidated financial statements are presented in U.S. dollars in conformity with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q Regulation S-X The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the audited financial statements and notes thereto included in the Annual Report on Form 10-K
Restatement of Previously Reported Financial Statements			Restatement of Previously Reported Financial Statements In connection with the preparation of the Company’s unaudited condensed consolidated financial statements for the quarterly period ended September 30, 2021, the Company concluded it should restate its previously issued financial statements to classify all Class A ordinary shares subject to possible redemption in temporary equity. In accordance with the SEC and its staff’s guidance on redeemable equity instruments in ASC 480 10-S99, In connection with the change in presentation for the Class A ordinary shares subject to possible redemption, the Company has restated its earnings per share calculation to allocate income and losses shared pro rata between the two classes of shares. This presentation contemplates a Business Combination as the most likely outcome, in which case, both classes of shares participate pro rata in the income and losses of the Company. In accordance with SEC Staff Accounting Bulletin No. 99, “Materiality,” and SEC Staff Accounting Bulletin No. 108, “Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements,” the Company evaluated the corrections and has determined that the related impact was material to the previously filed financial statements that contained the error reported in the Company’s Form 10-Qs The table below presents the effect of the financial statement adjustments related to the restatement discussed above of the Company’s previously reported balance sheet as of March 31, 2021: As of March 31, 2021 As Previously Adjustment As Restated Total assets $ 277,256,530 $ — $ 277,256,530 Total liabilities $ 29,335,868 $ — $ 29,335,868 Class A ordinary shares subject to possible redemption 242,920,660 33,079,340 276,000,000 Preference shares — — — Class A ordinary shares 331 (331 ) — Class B ordinary shares 690 — 690 Additional paid-in $ 3,503,723 (3,503,723 ) — Retained earnings (accumulated deficit) $ 1,495,258 (29,575,286 ) $ (28,080,028 ) Total shareholders’ equity (deficit) $ 5,000,002 $ (33,079,340 ) $ (28,079,338 ) Total Liabilities, Class A Ordinary Shares Subject to Possible Redemption and Shareholders’ Equity (Deficit) $ 277,256,530 $ — $ 277,256,530 The Company’s statement of shareholders’ equity (deficit) has been restated to reflect the changes to the impacted shareholders’ equity (deficit) accounts described above. The table below presents the effect of the financial statement adjustments related to the restatement discussed above of the Company’s previously reported statement of cash flows for the three months ended March 31, 2021: Supplemental Disclosure of Noncash Financing As Reported Adjustment As Restated Initial $ 240,513,990 $ (240,513,990 ) $ — Change $ (8,038,720 ) $ 8,038,720 $ — The table below presents the effect of the financial statement adjustments related to the restatement discussed above of the Company’s previously reported balance sheet as of June 30, 2021: As of June 30, 2021 As Previously Adjustment As Restated Total assets $ 277,467,799 $ — $ 277,467,799 Total liabilities $ 39,992,526 $ — $ 39,992,526 Class A ordinary shares subject to possible redemption 232,475,270 43,524,730 276,000,000 Preference shares — — — Class A ordinary shares 435 (435 ) — Class B ordinary shares 690 — 690 Additional paid-in $ 13,949,009 (13,949,009 ) — Accumulated deficit $ (8,950,131 ) (29,575,286 ) $ (38,525,417 ) Total shareholders’ equity (deficit) $ 5,000,003 $ (43,524,730 ) $ (38,524,727 ) Total Liabilities, Class A Ordinary Shares Subject to Possible Redemption and Shareholders’ Equity (Deficit) $ 277,467,799 $ — $ 277,467,799 The impact to the reported amounts of weighted average shares outstanding and basic and diluted earnings per share is presented below for the Affected Quarterly Periods: Earnings Per Share for Class A ordinary shares As Reported Adjustment As Restated For the three months ended March 31, 2021 Net income $ 1,528,079 $ — $ 1,528,079 Weighted average shares outstanding 27,600,000 (3,066,667 ) 24,533,333 Basic and diluted earnings per ordinary share $ — $ 0.05 $ 0.05 For three months ended June 30, 2021 Net loss $ (10,445,389 ) $ — $ (10,445,389 ) Weighted average shares outstanding 27,600,000 — 27,600,000 Basic and diluted earnings per ordinary share $ — $ (0.30 ) $ (0.30 ) For the six months ended June 30, 2021 Net loss $ (8,917,310 ) $ — $ (8,917,310 ) Weighted average shares outstanding 27,600,000 (1,524,862 ) 26,075,138 Basic and diluted earnings per ordinary share $ — $ (0.27 ) $ (0.27 ) Earnings Per Share for Class B ordinary shares As Reported Adjustment As Restated For the three months ended March 31, 2021 Net income $ 1,528,079 $ — $ 1,528,079 Weighted average shares outstanding 6,800,000 — 6,800,000 Basic and diluted earnings per ordinary share $ 0.22 $ (0.17 ) $ 0.05 For three months ended June 30, 2021 Net loss $ (10,445,389 ) $ — $ (10,445,389 ) Weighted average shares outstanding 6,900,000 — 6,900,000 Basic and diluted earnings per ordinary share $ (1.51 ) $ 1.21 $ (0.30 ) For the six months ended June 30, 2021 Net loss $ (8,917,310 ) $ — $ (8,917,310 ) Weighted average shares outstanding 6,850,276 — 6,850,276 Basic and diluted earnings per ordinary share $ (1.31 ) $ 1.04 $ (0.27 ) The Company’s statement of shareholders’ equity (deficit) has been restated to reflect the changes to the impacted shareholders’ equity (deficit) accounts described above. The table below presents the effect of the financial statement adjustments related to the restatement discussed above of the Company’s previously reported statement of cash flows for the six months ended June 30, 2021: Supplemental Disclosure of Noncash Financing Activities: As Reported Adjustment As Restated Initial value of Class A ordinary shares subject to possible redemption $ 240,513,990 $ (240,513,990 ) $ — Change in value of Class A ordinary shares subject to possible redemption $ (8,038,720 ) $ 8,038,720 $ —
Use of Estimates	Use of estimates The preparation of financial statement in conformity with GAAP requires the Company’s management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statement. Making estimates requires management to exercise significant judgment. It is at least reasonably possible that the estimate of the effect of a condition, situation or set of circumstances that existed at the date of the financial statement, which management considered in formulating its estimate, could change in the near term due to one or more future confirming events. Accordingly, the actual results could differ significantly from those estimates. Fair value of financial instruments The fair value of the Company’s assets and liabilities, which qualify as financial instruments under the FASB ASC 820, “Fair Value Measurements and Disclosures,” approximates the carrying amounts represented in the balance sheet, primarily due to their short-term nature.	Use of estimates The preparation of financial statements in conformity with GAAP requires the Company’s management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. Making estimates requires management to exercise significant judgment. It is at least reasonably possible that the estimate of the effect of a condition, situation or set of circumstances that existed at the date of the financial statements, which management considered in formulating its estimate, could change in the near term due to one or more future confirming events. Accordingly, the actual results could differ significantly from those estimates.	Use of Estimates The preparation of unaudited condensed consolidated financial statements in conformity with GAAP requires the Company’s management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the unaudited condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Making estimates requires management to exercise significant judgment. It is at least reasonably possible that the estimate of the effect of a condition, situation or set of circumstances that existed at the date of the unaudited condensed consolidated financial statements, which management considered in formulating its estimate, could change in the near term due to one or more future confirming events. One of the more significant accounting estimates included in these unaudited condensed consolidated financial statements is the determination of the fair value of the warrant liabilities. Such estimates may be subject to change as more current information becomes available and accordingly the actual results could differ significantly from those estimates.
Cash and Cash Equivalents	Cash and cash equivalents The Company considers all short-term investments with an original maturity of three months or less when purchased to be cash equivalents. The Company had no cash equivalents as of January 11, 2021.	Cash and cash equivalents The Company considers all short-term investments with an original maturity of three months or less when purchased to be cash equivalents. The Company had no cash equivalents as of December 31, 2020.	Cash and Cash Equivalents The Company considers all short-term investments with an original maturity of three months or less when purchased to be cash equivalents. The Company had no cash equivalents as of September 30, 2021 and December 31, 2020.
Concentration of Credit Risk	Concentration of credit risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash accounts in a financial institution, which, at times, may exceed the Federal Depository Insurance Coverage limit of $250,000. At January 11, 2021, the Company has not experienced losses on these accounts and management believes the Company is not exposed to significant risks on such accounts.	Concentration of credit risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of a cash account in a financial institution, which, at times, may exceed the Federal depository insurance coverage limit of $250,000. The Company has not experienced losses on this account and management believes the Company is not exposed to significant risks on the account.	Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash accounts in a financial institution, which, at times, may exceed the Federal Deposit Insurance Corporation coverage limits of $250,000 and any cash held in Trust Account. As of September 30, 2021 and December 31, 2020, the Company had not experienced losses on these accounts and management believes the Company is not exposed to significant risks on such account.
Fair Value Measurements	Fair Value Measurements Fair value is defined as the price that would be received for sale of an asset or paid for transfer of a liability, in an orderly transaction between market participants at the measurement date. GAAP establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). These tiers consist of: • Level 1, defined as observable inputs such as quoted prices (unadjusted) for identical instruments in active markets; • Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable such as quoted prices for similar instruments in active markets or quoted prices for identical or similar instruments in markets that are not active; and • Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions, such as valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable. In some circumstances, the inputs used to measure fair value might be categorized within different levels of the fair value hierarchy. In those instances, the fair value measurement is categorized in its entirety in the fair value hierarchy based on the lowest level input that is significant to the fair value measurement.		Fair Value Measurements Fair value is defined as the price that would be received for sale of an asset or paid for transfer of a liability, in an orderly transaction between market participants at the measurement date. GAAP establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). These tiers consist of: • Level 1, defined as observable inputs such as quoted prices (unadjusted) for identical instruments in active markets; • Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable such as quoted prices for similar instruments in active markets or quoted prices for identical or similar instruments in markets that are not active; and • Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions, such as valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable. In some circumstances, the inputs used to measure fair value might be categorized within different levels of the fair value hierarchy. In those instances, the fair value measurement is categorized in its entirety in the fair value hierarchy based on the lowest level input that is significant to the fair value measurement.
Principles of Consolidation			Principles of Consolidation The condensed consolidated financial statements of the Company include its wholly-owned subsidiary, Wormhole Merger Sub Pte. Ltd., which was incorporated in Singapore on June 28, 2021, in connection with the planned business combination. All inter-company accounts and transactions are eliminated in consolidation.
Emerging Growth Company	Emerging growth company The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and it may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies including, but not limited to, not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act of 2002, reduced disclosure obligations regarding executive compensation in its periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and shareholder approval of any golden parachute payments not previously approved. Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that an emerging growth company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging	Emerging growth company The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and it may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies including, but not limited to, not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act of 2002, reduced disclosure obligations regarding executive compensation in its periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and shareholder approval of any golden parachute payments not previously approved. Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that an emerging growth company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging	Emerging Growth Company The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and it may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies including, but not limited to, not being required to comply with the independent registered public accounting firm attestation requirements of Section 404 of the Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in its periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and shareholder approval of any golden parachute payments not previously approved. Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that an emerging growth company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging This may make comparison of the Company’s unaudited condensed consolidated financial statements with another public company that is neither an emerging growth company nor an emerging growth company that has opted out of using the extended transition period difficult or impossible because of the potential differences in accounting standards used.
Cash Held In Trust Account	Cash held in Trust Account At January 11, 2021, the Company had $276.0 million in cash held in the Trust Account.
Investments Held in Trust Account			Investments Held in Trust Account The Company’s portfolio of investments is comprised of U.S. government securities, within the meaning set forth in Section 2(a)(16) of the Investment Company Act, with a maturity of 185 days or less, or investments in money market funds that invest in U.S. government securities and generally have a readily determinable fair value, or a combination thereof. When the Company’s investments held in the Trust Account are comprised of U.S. government securities, the investments are classified as trading securities. When the Company’s investments held in the Trust Account are comprised
Fair Value of Financial Instruments		Fair value of financial instruments The fair value of the Company’s assets and liabilities, which qualify as financial instruments under FASB ASC Topic 820, “Fair Value Measurements”, approximates the carrying amounts represented in the balance sheet, primarily due to their short-term nature.	Fair Value of Financial Instruments The fair value of the Company’s assets and liabilities, which qualify as financial instruments under the FASB ASC Topic 820, “Fair Value Measurements,” approximates the carrying amounts represented in the condensed balance sheets. The Company has elected the fair value option to account for its Convertible Note with its Sponsor as defined and more fully described in Note 5. As a result of applying the fair value option, the Company records each draw at fair value with a gain or loss recognized at issuance, and subsequent changes in fair value are recorded as change in the fair value of Convertible Note — related party on the condensed statement of operations. The fair value is based on prices or valuation techniques that require inputs that are both unobservable and significant to the overall fair value measurement. These inputs reflect management’s and, if applicable, an independent third-party valuation firm’s own assumption about the assumptions a market participant would use in pricing the asset or liability.
Derivative Warrant Liabilities	Derivative warrant liabilities The Company does not use derivative instruments to hedge exposures to cash flow, market, or foreign currency risks. The Company evaluates all of its financial instruments, including issued stock purchase warrants, to determine if such instruments are derivatives or contain features that qualify as embedded derivatives, pursuant to ASC 480 and ASC 815. The classification of derivative instruments, including whether such instruments should be recorded as liabilities or as equity, is re-assessed The Public Warrants and the Private Placement Warrants (as defined in Note 5) are recognized as derivative liabilities in accordance with ASC 815-40. non-current		Derivative warrant liabilities The Company does not use derivative instruments to hedge exposures to cash flow, market, or foreign currency risks. The Company evaluates all of its financial instruments, including issued stock purchase warrants, to determine if such instruments are derivatives or contain features that qualify as embedded derivatives, pursuant to ASC 480 and ASC Subtopic 815-15 re-assessed The warrants issued in connection with the Initial Public Offering (the “Public Warrants”) and the Private Placement Warrants (as defined in Note 4) (collectively, the “Warrant”) are recognized as derivative liabilities in accordance with ASC 815-40. non-current
Offering Costs Associated with the Initial Public Offering	Offering costs associated with the Initial Public Offering Offering costs consisted of legal, accounting, underwriting fees and other costs incurred through the Initial Public Offering that were directly related to the Initial Public Offering. Offering costs are allocated to the separable financial instruments issued in the Initial Public Offering based on a relative fair value basis, compared to total proceeds received. Offering costs associated with warrant liabilities are expensed as incurred and presented as non-operating non-current	Offering costs associated with the Initial Public Offering Offering costs consisted of legal, accounting, and other costs incurred that were directly related to the Initial Public Offering and that were charged to shareholders’ equity upon the completion of the Initial Public Offering.	Offering Costs Associated with the Initial Public Offering Offering costs consisted of legal, accounting, underwriting fees and other costs incurred through the Initial Public Offering that were directly related to the Initial Public Offering. Offering costs are allocated to the separable financial instruments issued in the Initial Public Offering based on a relative fair value basis, compared to total proceeds received. Offering costs associated with warrant liabilities are expensed as incurred and presented as non-operating non-current
Class A Ordinary Shares Subject to Possible Redemption	Class A ordinary shares subject to possible redemption The Company accounts for its Class A ordinary shares subject to possible redemption in accordance with the guidance in ASC 480. Class A ordinary shares subject to mandatory redemption (if any) are classified as liability instruments and are measured at fair value. Conditionally redeemable Class A ordinary shares (including Class A ordinary shares that feature redemption rights that are either within the control of the holder or subject to redemption upon the occurrence of uncertain events not solely within the Company’s control) are classified as temporary equity. At all other times, Class A ordinary shares are classified as shareholders’ equity. The Company’s Class A ordinary shares feature certain redemption rights that are considered to be outside of the Company’s control and subject to the occurrence of uncertain future events. Accordingly, at January 11, 2021, 27,600,000 Class A ordinary shares subject to possible redemption are presented as temporary equity, outside of the shareholders’ equity section of the Company’s balance sheet. The Company recognizes changes in redemption value immediately as they occur and adjusts the carrying value of the Class A ordinary shares subject to possible redemption to equal the redemption value at the end of each reporting period. This method would view the end of the reporting period as if it were also the redemption date for the security. Effective with the closing of the Initial Public Offering, the Company recognized the accretion from initial book value to redemption amount, which resulted in charges against additional paid-in		Class A Ordinary Shares Subject to Possible Redemption The Company accounts for its Class A ordinary shares subject to possible redemption in accordance with the guidance in ASC Topic 480 “Distinguishing Liabilities from Equity.” Class A ordinary shares subject to mandatory redemption (if any) are classified as liability instruments and are measured at fair value. Conditionally redeemable Class A ordinary shares (including Class A ordinary shares that feature redemption rights that are either within the control of the holder or subject to redemption upon the occurrence of uncertain events not solely within the Company’s control) are classified as temporary equity. At all other times, Class A ordinary shares are classified as shareholders’ equity. The Company’s Class A ordinary shares feature certain redemption rights that are considered to be outside of the Company’s control and subject to the occurrence of uncertain future events. Accordingly, as of Initial Public Offering, 27,600,000 Class A ordinary shares subject to possible redemption are presented as temporary equity, outside of the shareholders’ equity (deficit) section of the Company’s unaudited condensed consolidated balance sheets. As of December 31, 2020, there were no Class A ordinary shares subject to possible redemption. Effective with the closing of the Initial Public Offering, the Company recognized the accretion from initial book value to redemption amount, which resulted in charges against additional paid-in
Income Taxes	Income taxes ASC Topic 740 prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more-likely-than-not There is currently no taxation imposed on income by the Government of the Cayman Islands. In accordance with Cayman federal income tax regulations, income taxes are not levied on the Company. Consequently, income taxes are not reflected in the Company’s financial statement. The Company’s management does not expect that the total amount of unrecognized tax benefits will materially change over the next twelve months.	Income taxes FASB ASC Topic 740 prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more-likely-than-not There is currently no taxation imposed on income by the Government of the Cayman Islands. In accordance with Cayman federal income tax regulations, income taxes are not levied on the Company. Consequently, income taxes are not reflected in the Company’s financial statements. The Company’s management does not expect that the total amount of unrecognized tax benefits will materially change over the next twelve months.	Income Taxes The Company complies with the accounting and reporting requirements of FASB ASC Topic 740, “Income Taxes,” which prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more-likely-than-not There is currently no taxation imposed on income by the Government of the Cayman Islands. In accordance with Cayman federal income tax regulations, income taxes are not levied on the Company. Consequently, income taxes are not reflected in the Company’s unaudited condensed consolidated financial statement. The Company’s management does not expect that the total amount of unrecognized tax benefits will materially change over the next twelve months.
Net Income (Loss) Per Ordinary Share			Net Income (Loss) Per Ordinary Share The Company complies with accounting and disclosure requirements of FASB ASC Topic 260, “Earnings Per Share.” The Company has two classes of ordinary shares, which are referred to as Class A ordinary shares and Class B ordinary shares. Income and losses are shared pro rata between the two classes of ordinary shares. Net income (loss) per ordinary share is calculated by dividing the net income (loss) by the weighted average ordinary shares outstanding for the respective period. The calculation of diluted net income (loss) per ordinary share does not consider the effect of the warrants issued in connection with the Initial Public Offering and the Private Placement to purchase an aggregate of 14,213,280 Class A ordinary share in the calculation of diluted income (loss) per ordinary share, because their exercise is contingent upon future events. As a result, diluted net income (loss) per ordinary share is the same as basic net income (loss) per share ordinary for the three and nine months ended September 30, 2021. Accretion associated with the redeemable Class A ordinary shares is excluded from earnings per ordinary share as the redemption value approximates fair value. The following table reflects presents a reconciliation of the numerator and denominator used to compute basic and diluted net income (loss) per ordinary share for each class of ordinary shares: For the Three Months Ended September 30, 2021 For the Nine Months Ended September 30, 2021 For the Period From July 8, 2020 (Inception) Through September 30, 2020 Class A Class B Class A Class B Class A Class B Basic and diluted net income (loss) per ordinary share: Numerator: Allocation of net income (loss) $ 2,699,294 $ 674,824 $ (4,405,422 ) $ (1,137,770 ) $ — $ (20,233 ) Denominator: Basic and diluted weighted average ordinary shares outstanding 27,600,000 6,900,000 26,589,011 6,867,033 — 6,000,000 Basic and diluted net income (loss) per ordinary share $ 0.10 $ 0.10 $ (0.17 ) $ (0.17 ) $ — $ (0.00 )
Recent Accounting Pronouncements	Recent Accounting Pronouncements Management does not believe that any recently issued, but not yet effective, accounting pronouncements, if currently adopted, would have a material effect on the Company’s financial statement.	Recent Accounting Pronouncements Management does not believe that any recently issued, but not yet effective, accounting pronouncements, if currently adopted, would have a material effect on the Company’s financial statements.	Recent Accounting Standards In August 2020, the FASB issued Accounting Standards Update (“ASU”) No. 2020-06, Debt — Debt with Conversion and Other Options (Subtopic 470-20) — Contracts in Entity’ Own Equity (Subtopic 815-40): 2020-06”), 2020-06 The Company’s management does not believe that any other recently issued, but not yet effective, accounting standards if currently adopted would have a material effect on the accompanying unaudited condensed consolidated financial statements.

Restatement Of Previously Fil_2

Restatement Of Previously Filed Balance Sheet (Tables)	6 Months Ended	9 Months Ended
	Jan. 11, 2021	Sep. 30, 2021
Ivanhoe Capital Acquisition Corp [Member]
Schedule of impact of restatement on the balance sheets	The following tables summarize the effect of the revision on each financial statement line item as of the date indicated: As of January 11, 2021 8-K Adjustment As Restated Total assets $ 278,183,053 $ — $ 278,183,053 Total current liabilities $ 861,057 $ — $ 861,057 Deferred underwriting commissions 9,660,000 — 9,660,000 Derivative warrant liabilities — 22,148,000 22,148,000 Total liabilities $ 10,521,057 $ 22,148,000 $ 32,669,057 Class A ordinary shares subject to possible redemption 262,661,990 13,338,010 276,000,000 Preference shares — — — Class A ordinary shares 133 (133 ) — Class B ordinary shares 690 — 690 Additional paid-in 5,040,999 (5,040,999 ) — Accumulated deficit (41,816 ) (30,444,878 ) (30,486,694 ) Total shareholders’ equity (deficit) $ 5,000,006 $ (35,486,010 ) $ (30,486,004 ) Total liabilities, Class A ordinary shares subject to possible redemption and shareholders’ equity (deficit) $ 278,183,053 $ — $ 278,183,053	The table below presents the effect of the financial statement adjustments related to the restatement discussed above of the Company’s previously reported balance sheet as of March 31, 2021: As of March 31, 2021 As Previously Adjustment As Restated Total assets $ 277,256,530 $ — $ 277,256,530 Total liabilities $ 29,335,868 $ — $ 29,335,868 Class A ordinary shares subject to possible redemption 242,920,660 33,079,340 276,000,000 Preference shares — — — Class A ordinary shares 331 (331 ) — Class B ordinary shares 690 — 690 Additional paid-in $ 3,503,723 (3,503,723 ) — Retained earnings (accumulated deficit) $ 1,495,258 (29,575,286 ) $ (28,080,028 ) Total shareholders’ equity (deficit) $ 5,000,002 $ (33,079,340 ) $ (28,079,338 ) Total Liabilities, Class A Ordinary Shares Subject to Possible Redemption and Shareholders’ Equity (Deficit) $ 277,256,530 $ — $ 277,256,530 The table below presents the effect of the financial statement adjustments related to the restatement discussed above of the Company’s previously reported statement of cash flows for the three months ended March 31, 2021: Supplemental Disclosure of Noncash Financing As Reported Adjustment As Restated Initial $ 240,513,990 $ (240,513,990 ) $ — Change $ (8,038,720 ) $ 8,038,720 $ — The table below presents the effect of the financial statement adjustments related to the restatement discussed above of the Company’s previously reported balance sheet as of June 30, 2021: As of June 30, 2021 As Previously Adjustment As Restated Total assets $ 277,467,799 $ — $ 277,467,799 Total liabilities $ 39,992,526 $ — $ 39,992,526 Class A ordinary shares subject to possible redemption 232,475,270 43,524,730 276,000,000 Preference shares — — — Class A ordinary shares 435 (435 ) — Class B ordinary shares 690 — 690 Additional paid-in $ 13,949,009 (13,949,009 ) — Accumulated deficit $ (8,950,131 ) (29,575,286 ) $ (38,525,417 ) Total shareholders’ equity (deficit) $ 5,000,003 $ (43,524,730 ) $ (38,524,727 ) Total Liabilities, Class A Ordinary Shares Subject to Possible Redemption and Shareholders’ Equity (Deficit) $ 277,467,799 $ — $ 277,467,799 The table below presents the effect of the financial statement adjustments related to the restatement discussed above of the Company’s previously reported statement of cash flows for the six months ended June 30, 2021: Supplemental Disclosure of Noncash Financing Activities: As Reported Adjustment As Restated Initial value of Class A ordinary shares subject to possible redemption $ 240,513,990 $ (240,513,990 ) $ — Change in value of Class A ordinary shares subject to possible redemption $ (8,038,720 ) $ 8,038,720 $ — The impact to the reported amounts of weighted average shares outstanding and basic and diluted earnings per share is presented below for the Affected Quarterly Periods: Earnings Per Share for Class A ordinary shares As Reported Adjustment As Restated For the three months ended March 31, 2021 Net income $ 1,528,079 $ — $ 1,528,079 Weighted average shares outstanding 27,600,000 (3,066,667 ) 24,533,333 Basic and diluted earnings per ordinary share $ — $ 0.05 $ 0.05 For three months ended June 30, 2021 Net loss $ (10,445,389 ) $ — $ (10,445,389 ) Weighted average shares outstanding 27,600,000 — 27,600,000 Basic and diluted earnings per ordinary share $ — $ (0.30 ) $ (0.30 ) For the six months ended June 30, 2021 Net loss $ (8,917,310 ) $ — $ (8,917,310 ) Weighted average shares outstanding 27,600,000 (1,524,862 ) 26,075,138 Basic and diluted earnings per ordinary share $ — $ (0.27 ) $ (0.27 ) Earnings Per Share for Class B ordinary shares As Reported Adjustment As Restated For the three months ended March 31, 2021 Net income $ 1,528,079 $ — $ 1,528,079 Weighted average shares outstanding 6,800,000 — 6,800,000 Basic and diluted earnings per ordinary share $ 0.22 $ (0.17 ) $ 0.05 For three months ended June 30, 2021 Net loss $ (10,445,389 ) $ — $ (10,445,389 ) Weighted average shares outstanding 6,900,000 — 6,900,000 Basic and diluted earnings per ordinary share $ (1.51 ) $ 1.21 $ (0.30 ) For the six months ended June 30, 2021 Net loss $ (8,917,310 ) $ — $ (8,917,310 ) Weighted average shares outstanding 6,850,276 — 6,850,276 Basic and diluted earnings per ordinary share $ (1.31 ) $ 1.04 $ (0.27 )

Basis of Presentation and Sum_3

Basis of Presentation and Summary of Significant Accounting Policies (Tables)	6 Months Ended	9 Months Ended	12 Months Ended
	Jan. 11, 2021	Sep. 30, 2021	Dec. 31, 2020
Schedule of basic and diluted net income (loss) per common share		The following table sets forth the computation of basic and diluted net loss per share (in thousands, except share and per share amounts): Three Months Ended Nine Months Ended 2021 2020 2021 2020 (Unaudited) (Unaudited) (Unaudited) (Unaudited) Numerator: Net loss $ (7,995 ) $ (3,312 ) $ (18,219 ) $ (10,043 ) Denominator: Weighted-average shares of common stock outstanding 10,258,463 10,245,074 10,249,586 10,245,074 Net loss per common share - $ (0.78 ) $ (0.32 ) $ (1.78 ) $ (0.98 )	The following table sets forth the computation of basic and diluted net loss per share (in thousands, except share and per share data): Year Ended December 31, 2020 2019 Numerator: Net loss $ (13,889 ) $ (14,702 ) Denominator: Weighted-average shares of common stock outstanding 10,245,074 10,223,375 Net loss per common share - $ (1.36 ) $ (1.44 )
Schedule of Estimated Useful Lives of the Assets			Property and equipment are stated at cost less accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets, as shown below: Estimated Useful Life (in years) Laboratory machinery and equipment 5 - Office and computer equipment 3 - Furniture and fixtures 5 Leasehold improvements Shorter of useful life or lease term
Ivanhoe Capital Acquisition Corp [Member]
Summary of effect of the financial statement adjustments related to the restatement	The following tables summarize the effect of the revision on each financial statement line item as of the date indicated: As of January 11, 2021 8-K Adjustment As Restated Total assets $ 278,183,053 $ — $ 278,183,053 Total current liabilities $ 861,057 $ — $ 861,057 Deferred underwriting commissions 9,660,000 — 9,660,000 Derivative warrant liabilities — 22,148,000 22,148,000 Total liabilities $ 10,521,057 $ 22,148,000 $ 32,669,057 Class A ordinary shares subject to possible redemption 262,661,990 13,338,010 276,000,000 Preference shares — — — Class A ordinary shares 133 (133 ) — Class B ordinary shares 690 — 690 Additional paid-in 5,040,999 (5,040,999 ) — Accumulated deficit (41,816 ) (30,444,878 ) (30,486,694 ) Total shareholders’ equity (deficit) $ 5,000,006 $ (35,486,010 ) $ (30,486,004 ) Total liabilities, Class A ordinary shares subject to possible redemption and shareholders’ equity (deficit) $ 278,183,053 $ — $ 278,183,053	The table below presents the effect of the financial statement adjustments related to the restatement discussed above of the Company’s previously reported balance sheet as of March 31, 2021: As of March 31, 2021 As Previously Adjustment As Restated Total assets $ 277,256,530 $ — $ 277,256,530 Total liabilities $ 29,335,868 $ — $ 29,335,868 Class A ordinary shares subject to possible redemption 242,920,660 33,079,340 276,000,000 Preference shares — — — Class A ordinary shares 331 (331 ) — Class B ordinary shares 690 — 690 Additional paid-in $ 3,503,723 (3,503,723 ) — Retained earnings (accumulated deficit) $ 1,495,258 (29,575,286 ) $ (28,080,028 ) Total shareholders’ equity (deficit) $ 5,000,002 $ (33,079,340 ) $ (28,079,338 ) Total Liabilities, Class A Ordinary Shares Subject to Possible Redemption and Shareholders’ Equity (Deficit) $ 277,256,530 $ — $ 277,256,530 The table below presents the effect of the financial statement adjustments related to the restatement discussed above of the Company’s previously reported statement of cash flows for the three months ended March 31, 2021: Supplemental Disclosure of Noncash Financing As Reported Adjustment As Restated Initial $ 240,513,990 $ (240,513,990 ) $ — Change $ (8,038,720 ) $ 8,038,720 $ — The table below presents the effect of the financial statement adjustments related to the restatement discussed above of the Company’s previously reported balance sheet as of June 30, 2021: As of June 30, 2021 As Previously Adjustment As Restated Total assets $ 277,467,799 $ — $ 277,467,799 Total liabilities $ 39,992,526 $ — $ 39,992,526 Class A ordinary shares subject to possible redemption 232,475,270 43,524,730 276,000,000 Preference shares — — — Class A ordinary shares 435 (435 ) — Class B ordinary shares 690 — 690 Additional paid-in $ 13,949,009 (13,949,009 ) — Accumulated deficit $ (8,950,131 ) (29,575,286 ) $ (38,525,417 ) Total shareholders’ equity (deficit) $ 5,000,003 $ (43,524,730 ) $ (38,524,727 ) Total Liabilities, Class A Ordinary Shares Subject to Possible Redemption and Shareholders’ Equity (Deficit) $ 277,467,799 $ — $ 277,467,799 The table below presents the effect of the financial statement adjustments related to the restatement discussed above of the Company’s previously reported statement of cash flows for the six months ended June 30, 2021: Supplemental Disclosure of Noncash Financing Activities: As Reported Adjustment As Restated Initial value of Class A ordinary shares subject to possible redemption $ 240,513,990 $ (240,513,990 ) $ — Change in value of Class A ordinary shares subject to possible redemption $ (8,038,720 ) $ 8,038,720 $ — The impact to the reported amounts of weighted average shares outstanding and basic and diluted earnings per share is presented below for the Affected Quarterly Periods: Earnings Per Share for Class A ordinary shares As Reported Adjustment As Restated For the three months ended March 31, 2021 Net income $ 1,528,079 $ — $ 1,528,079 Weighted average shares outstanding 27,600,000 (3,066,667 ) 24,533,333 Basic and diluted earnings per ordinary share $ — $ 0.05 $ 0.05 For three months ended June 30, 2021 Net loss $ (10,445,389 ) $ — $ (10,445,389 ) Weighted average shares outstanding 27,600,000 — 27,600,000 Basic and diluted earnings per ordinary share $ — $ (0.30 ) $ (0.30 ) For the six months ended June 30, 2021 Net loss $ (8,917,310 ) $ — $ (8,917,310 ) Weighted average shares outstanding 27,600,000 (1,524,862 ) 26,075,138 Basic and diluted earnings per ordinary share $ — $ (0.27 ) $ (0.27 ) Earnings Per Share for Class B ordinary shares As Reported Adjustment As Restated For the three months ended March 31, 2021 Net income $ 1,528,079 $ — $ 1,528,079 Weighted average shares outstanding 6,800,000 — 6,800,000 Basic and diluted earnings per ordinary share $ 0.22 $ (0.17 ) $ 0.05 For three months ended June 30, 2021 Net loss $ (10,445,389 ) $ — $ (10,445,389 ) Weighted average shares outstanding 6,900,000 — 6,900,000 Basic and diluted earnings per ordinary share $ (1.51 ) $ 1.21 $ (0.30 ) For the six months ended June 30, 2021 Net loss $ (8,917,310 ) $ — $ (8,917,310 ) Weighted average shares outstanding 6,850,276 — 6,850,276 Basic and diluted earnings per ordinary share $ (1.31 ) $ 1.04 $ (0.27 )
Schedule of basic and diluted net income (loss) per common share		For the Three Months Ended September 30, 2021 For the Nine Months Ended September 30, 2021 For the Period From July 8, 2020 (Inception) Through September 30, 2020 Class A Class B Class A Class B Class A Class B Basic and diluted net income (loss) per ordinary share: Numerator: Allocation of net income (loss) $ 2,699,294 $ 674,824 $ (4,405,422 ) $ (1,137,770 ) $ — $ (20,233 ) Denominator: Basic and diluted weighted average ordinary shares outstanding 27,600,000 6,900,000 26,589,011 6,867,033 — 6,000,000 Basic and diluted net income (loss) per ordinary share $ 0.10 $ 0.10 $ (0.17 ) $ (0.17 ) $ — $ (0.00 )

Cash, Cash Equivalents, and R_2

Cash, Cash Equivalents, and Restricted Cash (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Schedule of Cash, Cash Equivalents Restricted Cash and Restricted Cash Equivalents	Cash, cash equivalents, and restricted cash consisted of the following (in thousands): September 30, December 31, 2021 2020 (Unaudited) Cash $ 25,098 $ 1,335 Cash equivalents: Money market funds . 4,995 1,104 Restricted cash: Certificates of deposit . 547 289 Total cash, cash equivalents, and restricted cash $ 30,640 $ 2,728	Cash, cash equivalents, and restricted cash consisted of the following (in thousands): December 31, 2020 2019 Cash $ 1,335 $ 201 Cash equivalents: Money market funds 1,104 25,198 Restricted cash: Certificates of deposit 289 583 Total cash, cash equivalents, and restricted cash $ 2,728 $ 25,982

Related Party Transactions (Tab

Related Party Transactions (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Related Party Transactions [Abstract]
Summary of related party role in entity and voting interest on fully diluted basis	As of September 30, 2021 and December 31, 2020, the following were considered as related parties due to their role in the Company and/or voting interest on a fully diluted basis: Voting Voting in 2021 on a in 2020 on a fully diluted fully diluted Name Role basis basis Dr. Qichao Hu Chief Executive Officer, Founder and Board representation 13.4 % 15.5 % Long Siang Pte. Ltd Board representation 8.3 % 9.6 % Vertex Legacy Continuation Fund Pte. Ltd Board representation 9.7 % 10.8 % General Motors Ventures LLC Board representation 7.0 % 7.3 % Tianqi Lithium HK Co., Ltd. Board representation 9.3 % 10.8 % Anderson Investments Pte. Ltd. Board representation 8.7 % 10.0 % SK Holdings Board representation 12.9 % 11.9 %	As of December 31, 2020 and 2019, the following were considered related parties due to their role in the Company and/or voting interest on a fully diluted basis: Name Role Voting Interest in 2020 and 2019 on a fully diluted basis Dr. Qichao Hu Chief Executive Officer, Founder and Board representation 15.47 % Long Siang Pte. Ltd. Board representation 9.58 % Vertex Legacy Continuation Fund Pte. Ltd. Board representation 10.79 % General Motors Ventures LLC Board representation 7.25 % Tianqi Lithium HK Co., Ltd. Board representation 10.76 % Anderson Investments Pte. Ltd. Board representation 10.04 % SK Holdings Board representation 11.89 %

Property And Equipment, Net (Ta

Property And Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property and equipment, net consisted of the following (in thousands): December 31, 2020 2019 Laboratory machinery and equipment $ 6,227 $ 5,878 Office and computer equipment 234 213 Leasehold improvements 3,369 3,306 9,830 9,397 Less: Accumulated depreciation (3,786 ) (2,212 ) Property and equipment, net $ 6,044 $ 7,185

Intangible Assets, Net (Tables)

Intangible Assets, Net (Tables)	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets	Intangible assets, net consisted of the following (in thousands): December 31, 2020 2019 Intangible assets - Patents $ 1,918 $ 1,918 Less: Accumulated amortization (190 ) (62 ) Intangible assets, net $ 1,728 $ 1,856
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The estimated future amortization expenses for patent assets are as follows (in thousands): Year Ending $ 128 2022 128 2023 128 2024 128 2025 128 Thereafter 1,088 Total $ 1,728

Accrued compensation, Accrued_2

Accrued compensation, Accrued Expenses And Other Current Liabilities (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Schedule Of Employee Related Liabilities Current	Accrued compensation consisted of the following (in thousands): September 30, December 31, 2021 2020 (Unaudited) Accrued bonus $ 1,014 $ 1,068 Other 995 148 Accrued compensation $ 2,009 $ 1,216	Accrued compensation consisted of the following (in thousands): December 31, 2020 2019 Accrued bonus $ 1,068 $ 441 Other 148 145 Accrued compensation $ 1,216 $ 586
Schedule Of Accrued Liabilities And Other Current Liabilities	Accrued expenses and other current liabilities consisted of the following (in thousands): September 30, December 31, 2021 2020 (Unaudited) Deferred rent liabilities $ 239 $ 231 Payments received under joint development agreements 136 160 Accrued professional services 403 — Income taxes payable 137 115 Other 437 282 Accrued expenses and other current liabilities $ 1,352 $ 788	Accrued expenses and other current liabilities consisted of the following (in thousands): December 31, 2020 2019 Deferred rent liabilities $ 231 $ 153 Accrual related to purchase of property and equipment 69 334 Income taxes payable 115 108 Other 373 418 Accrued expenses and other current liabilities $ 788 $ 1,013

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Summary of Deferred Rent	Upon execution of the agreements inclusive of escalating rent payments, expense is being recognized on a straight-line basis and the difference between the recognized rent expense and the amounts paid under the operating leases are being recorded as deferred rent and included in other short-term and long-term liabilities on the condensed consolidated balance sheets as follows (in thousands): September 30, December 31, 2021 2020 (Unaudited) Deferred rent included in accrued expenses and other current liabilities $ 239 $ 231 Deferred rent included in other liabilities 537 607 Total deferred rent $ 776 $ 838	Upon execution of the agreements inclusive of escalating rent payments, expense is being recognized on a straight-line basis and the difference between the recognized rent expense and the amounts paid under the operating leases are being recorded as deferred rent and included in other short-term and long-term liabilities on the consolidated balance sheets as follows (in thousands): December 31, 2020 2019 Deferred rent included in accrued expenses and other current liabilities $ 231 $ 153 Deferred rent included in other liabilities 607 541 Total deferred rent $ 838 $ 694
Summary of Future Minimum Operating Lease Payments	The future minimum payments at September 30, 2021 under all operating leases are as follows (in thousands): Year Ending Remainder of 2021 $ 358 2022 2,696 2023 2,449 2024 2,188 2025 2,235 Thereafter 1,389 Total future minimum lease payments $ 11,315	The future minimum payments at December 31, 2020 under all operating leases are as follows (in thousands): Year Ending $ 1,408 2022 1,390 2023 1,111 2024 823 2025 837 Thereafter 567 Total future minimum lease payments $ 6,136

Redeemable Convertible Prefer_2

Redeemable Convertible Preferred Stock (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Temporary Equity Disclosure [Abstract]
Schedule of Redeemable Convertible Preferred Stock Issued and Outstanding	The Company has the following redeemable convertible preferred stock issued and outstanding (in thousands, except share and per share data): September 30, 2021 Series Issue Price per share Shares Authorized Shares Issued and Outstanding Liquidation Amount Carrying Amount Series A $ 0.8340 5,395,685 5,395,685 $ 4,500 $ 4,413 Series B $ 2.2513 5,108,073 5,108,073 11,500 11,362 Series C $ 2.8652 12,789,050 12,789,050 36,643 36,324 Series C plus $ 4.8361 6,203,345 6,203,345 30,000 29,945 Series D $ 28.4413 4,869,854 4,869,854 138,505 138,257 Series D plus $ 29.4449 1,698,088 1,698,088 50,000 49,640 36,064,095 36,064,095 $ 271,148 $ 269,941 December 31, 2020 Series Issue Price Shares Shares Issued Liquidation Carrying Series A $ 0.8340 5,395,685 5,395,685 $ 4,500 $ 4,413 Series B $ 2.2513 5,108,073 5,108,073 11,500 11,362 Series C $ 2.8652 12,789,050 12,789,050 36,643 36,324 Series C plus $ 4.8361 6,203,345 6,203,345 30,000 29,945 29,496,153 29,496,153 $ 82,643 $ 82,044	The Company has the following redeemable convertible preferred stock issued and outstanding (in thousands, except share and per share data): December 31, 2020 and 2019 Issue Price Shares Shares Issued Liquidation Carrying Series per share Authorized and Outstanding Amount Amount Series A $ 0.8340 5,395,685 5,395,685 $ 4,500 $ 4,413 Series B $ 2.2513 5,108,073 5,108,073 11,500 $ 11,362 Series C $ 2.8652 12,789,050 12,789,050 36,643 $ 36,324 Series C plus $ 4.8361 6,203,345 6,203,345 30,000 $ 29,945 29,496,153 29,496,153 $ 82,643 $ 82,044

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Summary Of Stock Option plan Activity	The following table summarizes the activity under the Company’s stock option plan (in thousands, except per share amount and contractual term): Number of Weighted- Number of Shares Average Shares Underlying Weighted- Remaining Aggregate Available Outstanding Average Exercise Contractual Intrinsic for Grant Options Price per Share Term (in years) Value Outstanding - 2,564,190 1,157,769 $ 0.72 7.8 $ 243 Additional shares authorized 486,975 — Options granted (2,587,516 ) 2,587,516 1.00 Options exercised — (20,539 ) 0.69 — — Options cancelled and forfeited 27,354 (27,354 ) 0.65 Outstanding - 491,003 3,697,392 $ 0.92 8.7 $ 231 Vested and expected to vest - 3,697,392 $ 0.92 8.7 $ 231 Exercisable - 867,272 $ 0.70 6.8 $ 202 Number of Weighted- Number of Shares Average Shares Underlying Weighted- Remaining Aggregate Available Outstanding Average Exercise Contractual Intrinsic for Grant Options Price per Share Term (in years) Value Outstanding - 2,818,286 903,700 $ 0.69 7.0 $ 138 Options granted (188,920 ) 188,920 0.82 Options exercised — — — — — Options cancelled and forfeited 30,641 (30,641 ) 0.82 Outstanding - 2,660,007 1,061,979 $ 0.71 7.9 $ 135 Vested and expected to vest - 1,061,979 $ 0.71 7.9 $ 135 Exercisable - 751,267 $ 0.68 7.7 $ 112	The following table summarizes the activity under the Company’s stock option plan (in thousands, except per share data and contractual term): Weighted- Weighted- Number of Number of Average Average Shares Shares Underlying Exercise Remaining Aggregate Available for Outstanding Price per Contractual Intrinsic Grant Options Share Term (in years) Value Outstanding - 2,982,792 779,166 $ 0.44 7.0 $ 336 Options granted (537,200 ) 537,200 0.87 Options exercised — (40,000 ) 0.41 — 18 Options cancelled and forfeited 372,694 (372,666 ) 0.45 Outstanding - 2,818,286 903,700 $ 0.69 8.4 $ 138 Options granted (287,720 ) 287,720 0.81 Options exercised — — — — — Options cancelled and forfeited 33,624 (33,651 ) 0.75 Outstanding - 2,564,190 1,157,769 $ 0.72 7.8 $ 243 Vested and expected to vest - 903,700 $ 0.69 8.4 $ 138 Exercisable - 260,205 $ 0.45 7.0 $ 94 Vested and expected to vest - 1,157,769 $ 0.72 7.8 $ 243 Exercisable - 701,122 $ 0.66 7.4 $ 187
Schedule Of Fair Value Of the Employee Stock Options Calculated Using Black scholes Option Pricing Models based on Valuation Assumptions	The estimated grant date fair values of the employee stock options were calculated using the Black-Scholes option-pricing models based on the following assumptions: Three Months Ended Nine months Ended September 30, 2021 2020 2021 2020 (Unaudited) (Unaudited) (Unaudited) (Unaudited) Expected term (in years) 6.08 6.08 6.08 2.50 to 6.08 Risk-free interest rate 0.85% to 0.98% 0.37% 0.64% to 1.13% 0.26% to 0.94% Expected volatility 69.28% to 69.31% 64.43% 67.99% to 69.33% 61.76 to 68.43% Expected dividend rate — — — —	The estimated grant date fair values of the employee stock options were calculated using the Black-Scholes option-pricing models based on the following assumptions: Year Ended December 31, 2020 2019 Expected term (in years) 5.0 - 6.1 - Risk-free interest rate 0.4% to 0.9% 1.6% to 2.5% Expected volatility 61.8% to 67.5% 61.8% to 62.7% Expected dividend rate 0% 0%
Schedule Of Stock Based Compensation included in its consolidated statements of operations and comprehensive loss	The Company’s stock-based compensation included in its condensed consolidated statements of operations and comprehensive loss was as follows (in thousands): Three Months Ended Nine months Ended 2021 2020 2021 2020 (Unaudited) (Unaudited) (Unaudited) (Unaudited) Research and development $ 34 $ 6 $ 89 $ 66 General and administrative 123 14 254 68 Total stock-based compensation $ 157 $ 20 $ 343 $ 134	The Company’s stock-based compensation included in its consolidated statements of operations and comprehensive loss was as follows (in thousands): Year Ended December 31, 2020 2019 Research and development $ 72 $ 37 General and administrative 82 86 Total stock-based compensation $ 154 $ 123

Class A Ordinary Shares Subje_2

Class A Ordinary Shares Subject to Possible Redemption (Tables)	6 Months Ended	9 Months Ended	12 Months Ended
	Jan. 11, 2021	Sep. 30, 2021	Dec. 31, 2020
Schedule of reconciliation of Class A ordinary share subject to possible redemption reflected on the condensed balance sheet		The Company has the following redeemable convertible preferred stock issued and outstanding (in thousands, except share and per share data): September 30, 2021 Series Issue Price per share Shares Authorized Shares Issued and Outstanding Liquidation Amount Carrying Amount Series A $ 0.8340 5,395,685 5,395,685 $ 4,500 $ 4,413 Series B $ 2.2513 5,108,073 5,108,073 11,500 11,362 Series C $ 2.8652 12,789,050 12,789,050 36,643 36,324 Series C plus $ 4.8361 6,203,345 6,203,345 30,000 29,945 Series D $ 28.4413 4,869,854 4,869,854 138,505 138,257 Series D plus $ 29.4449 1,698,088 1,698,088 50,000 49,640 36,064,095 36,064,095 $ 271,148 $ 269,941 December 31, 2020 Series Issue Price Shares Shares Issued Liquidation Carrying Series A $ 0.8340 5,395,685 5,395,685 $ 4,500 $ 4,413 Series B $ 2.2513 5,108,073 5,108,073 11,500 11,362 Series C $ 2.8652 12,789,050 12,789,050 36,643 36,324 Series C plus $ 4.8361 6,203,345 6,203,345 30,000 29,945 29,496,153 29,496,153 $ 82,643 $ 82,044	The Company has the following redeemable convertible preferred stock issued and outstanding (in thousands, except share and per share data): December 31, 2020 and 2019 Issue Price Shares Shares Issued Liquidation Carrying Series per share Authorized and Outstanding Amount Amount Series A $ 0.8340 5,395,685 5,395,685 $ 4,500 $ 4,413 Series B $ 2.2513 5,108,073 5,108,073 11,500 $ 11,362 Series C $ 2.8652 12,789,050 12,789,050 36,643 $ 36,324 Series C plus $ 4.8361 6,203,345 6,203,345 30,000 $ 29,945 29,496,153 29,496,153 $ 82,643 $ 82,044
Ivanhoe Capital Acquisition Corp [Member]
Schedule of reconciliation of Class A ordinary share subject to possible redemption reflected on the condensed balance sheet	The Class A ordinary shares subject to possible redemption reflected on the balance sheet is reconciled on the following table: Gross proceeds from Initial Public Offering $ 276,000,000 Less: Fair value of Public Warrants at issuance (14,628,000 ) Offering costs allocated to Class A ordinary shares subject to possible redemption (14,971,596 ) Plus: Accretion on Class A ordinary shares subject to possible redemption amount 29,599,596 Class A ordinary shares subject to possible redemption $ 276,000,000	The Class A ordinary shares subject to possible redemption reflected on the unaudited condensed consolidated balance sheet is reconciled on the following table: Gross proceeds from Initial Public Offering $ 276,000,000 Less: Fair value of Public Warrants at issuance (14,628,000 ) Offering costs allocated to Class A ordinary shares subject to possible redemption (14,971,596 ) Plus: Accretion on Class A ordinary shares subject to possible redemption amount 29,599,596 Class A ordinary shares subject to possible redemption $ 276,000,000

Shareholders' Equity (Deficit)

Shareholders' Equity (Deficit) (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Stockholders' Equity Note [Abstract]
Schedule of Shares of Common Stock Available for Future Issuance on an as if Converted Basis	The Company has the following shares of common stock available for future issuance on an as-if September 30, December 31, 2021 2020 (Unaudited) Redeemable convertible preferred stock 36,064,095 29,496,153 Common stock options outstanding 3,697,392 3,718,568 Shares reserved for issuance under the Share Incentive Plan 491,003 3,418 40,252,490 33,218,139	The Company has the following shares of common stock available for future issuance on an as-if December 31, 2020 2019 Redeemable convertible preferred stock 29,496,153 29,496,153 Common stock options outstanding 1,157,796 903,700 Shares reserved for issuance under the 2018 Plan 2,564,190 2,818,286 33,218,139 33,218,139

Net Loss per Share (Tables)

Net Loss per Share (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted Net Loss Per Share	The following table sets forth the computation of basic and diluted net loss per share (in thousands, except share and per share amounts): Three Months Ended Nine Months Ended 2021 2020 2021 2020 (Unaudited) (Unaudited) (Unaudited) (Unaudited) Numerator: Net loss $ (7,995 ) $ (3,312 ) $ (18,219 ) $ (10,043 ) Denominator: Weighted-average shares of common stock outstanding 10,258,463 10,245,074 10,249,586 10,245,074 Net loss per common share - $ (0.78 ) $ (0.32 ) $ (1.78 ) $ (0.98 )	The following table sets forth the computation of basic and diluted net loss per share (in thousands, except share and per share data): Year Ended December 31, 2020 2019 Numerator: Net loss $ (13,889 ) $ (14,702 ) Denominator: Weighted-average shares of common stock outstanding 10,245,074 10,223,375 Net loss per common share - $ (1.36 ) $ (1.44 )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share for the periods presented because including them would have had an anti-dilutive effect: As of September 30, 2021 2020 (Unaudited) (Unaudited) Redeemable convertible preferred stock 36,064,095 29,496,153 Options to purchase common stock 3,697,392 1,061,979 Total 39,761,487 30,558,132	The following outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share for the periods presented because including them would have had an anti-dilutive effect: Year Ended December 31, 2020 2019 Redeemable convertible preferred stock 29,496,153 29,496,153 Options to purchase common stock 1,157,796 903,700 Total 30,653,949 30,399,853

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Schedule of Domestic and Foreign Components of Income (Loss) Before Income Taxes	The following table presents domestic and foreign components of income (loss) before income taxes (in thousands): December 31, 2020 2019 US $ (9,696 ) $ (12,672 ) Foreign (4,186 ) (1,922 ) $ (13,882 ) $ (14,594 )
Summary of the Income Tax Provision	A summary of the income tax provision is as follows (in thousands): December 31, 2020 2019 Current: Federal $ — $ — State 1 1 Foreign 6 107 7 108 Deferred: Federal — — State — — Foreign — — $ 7 $ 108
Schedule of Reconciliation of the Federal Statutory Tax Rate to the Effective Income Tax Rate	The reconciliation of the federal statutory income tax rate of 21% to the Company’s effective income tax rate is as follows (in percentage): December 31, 2020 2019 Federal statutory income tax rate 21.0 % 21.0 % Foreign Tax (0.1 )% (0.7 )% Foreign income taxed at non-US (0.2 )% (0.0 )% Other permanent items (0.9 )% (1.1 )% Research and development tax credits 2.2 % 3.0 % Unrecognized tax benefits (0.7 )% (0.7 )% Increase in Valuation Allowance (21.7 )% (21.8 )% Others 0.3 % (0.4 )% (0.1 )% (0.7 )%
Schedule of Components of Net Deferred Tax Assets	Significant components of the Company’s net deferred tax assets as of December 31, 2020 and 2019, are as follows (in thousands): December 31, 2020 2019 Deferred tax assets: Net operating losses $ 12,033 $ 9,142 Research and development tax credits 1,079 709 Accruals and Reserves 624 612 Stock-based compensation 93 65 Other 3 — Gross deferred tax assets 13,832 10,528 Valuation Allowance (13,711 ) (10,276 ) Total deferred tax assets 121 252 Deferred tax liabilities: Fixed Assets (121 ) (252 ) Total deferred tax liabilities (121 ) (252 ) Total net deferred tax assets $ — $ —
Schedule of Reconciliation of Beginning and Ending Balances of Unrecognized Tax Benefits	A reconciliation of the beginning and ending balances of unrecognized tax benefits is as follows (in thousands): December 31, 2020 2019 Beginning of the year $ 707 $ — Increase - 760 600 Increase - — 107 End of the year $ 1,467 $ 707

Segment and Geographic Inform_2

Segment and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Schedule Of Long lived Assets by geographical areas	Long-lived assets by geographical area were as follows (in thousands): December 31, 2020 2019 Property and equipment, net: United States $ 3,700 $ 4,618 China 2,344 2,567 Total property and equipment, net 6,044 7,185 Intangible assets, net: Singapore 1,728 1,856 Total intangible assets, net 1,728 1,856 Total long-lived assets $ 7,772 $ 9,041

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended	9 Months Ended	12 Months Ended
	Jan. 11, 2021	Sep. 30, 2021	Dec. 31, 2020
Schedule of company's financial assets and liabilities that are measured at fair value on a recurring basis		The following table presents information about the Company’s financial assets measured at fair value on a recurring basis (in thousands): September 30, 2021 (Unaudited) Level 1 Level 2 Level 3 Total Assets Cash equivalents in money market funds $ 4,995 $ — $ — $ 4,995 Restricted cash: — 547 — 547 Short-term investments: Time deposit — 150,000 — 150,000 $ 4,995 $ 150,547 $ — $ 155,542 December 31, 2020 Level 1 Level 2 Level 3 Total Assets Cash equivalents in money market funds $ 1,104 $ — $ — $ 1,104 Restricted cash — 289 — 289 Short-term investments: Corporate bonds — 4,299 — 4,299 Mutual funds — 7,992 — 7,992 $ 1,104 $ 12,580 $ — $ 13,684	The following table presents information about the Company’s financial assets measured at fair value on a recurring basis (in thousands): December 31, 2020 Level 1 Level 2 Level 3 Total Assets Cash equivalents in money market funds $ 1,104 $ — $ — $ 1,104 Restricted cash — 289 — 289 Short-term investments: Corporate bonds — 4,299 — 4,299 Mutual funds — 7,992 — 7,992 $ 1,104 $ 12,580 $ — $ 13,684 December 31, 2019 Level 1 Level 2 Level 3 Total Assets Cash equivalents in money market funds $ 25,198 $ — $ — $ 25,198 Restricted cash — 583 — 583 $ 25,198 $ 583 $ — $ 25,781
Ivanhoe Capital Acquisition Corp [Member]
Schedule of company's financial assets and liabilities that are measured at fair value on a recurring basis	The following table presents information about the Company’s liabilities that are measured at fair value on a recurring basis as of January 11, 2021 and indicates the fair value hierarchy of the valuation techniques that the Company utilized to determine such fair value: Description Quoted Prices in Significant Other Observable (Level 2) Significant Other Unobservable (Level 3) Liabilities: Derivative warrant liabilities – Public Warrants $ — $ — $ 14,628,000 Derivative warrant liabilities – Private Placement Warrants $ — $ — $ 7,520,000	The following table presents information about the Company’s financial assets and liabilities that are measured at fair value on a recurring basis as of September 30, 2021 and indicates the fair value hierarchy of the valuation techniques that the Company utilized to determine such fair value: Description Quoted Prices in Significant Other Significant Other Assets: Investments held in Trust Account $ 276,052,152 $ — $ — Liabilities: Derivative warrant liabilities – Public Warrants $ 13,340,000 $ — $ — Derivative warrant liabilities – Private Placement Warrants $ — $ — $ 7,419,730 Convertible note – related party $ — $ — $ 1,064,140
Schedule of quantitative information regarding and derivative warrant liabilities measured Level 3 fair value measurements inputs	The following table provides quantitative information regarding Level 3 fair value measurements inputs at their measurement date: As of Option term (in years) 6.47 Stock price $ 9.91 Volatility 14.0 % Risk-free interest rate 0.75 % Expected dividends 0.00 %	The following table provides quantitative information regarding Level 3 fair value measurements inputs at their measurement dates: As of September 30, 2021 Option term (in years) 5.09 Stock price $ 9.90 Volatility 21.1 % Risk-free interest rate 0.99 % Expected dividends — % The change in the fair value of the derivative warrant liabilities measured using Level 3 inputs for the three and nine months ended September 30, 2021 is summarized as follows: Derivative warrant liabilities at January 1, 2021 $ — Issuance of Public and Private Warrants 22,148,000 Transfer of Public Warrants to Level 1 measurement (14,628,000 ) Change in fair value of derivative warrant liabilities (451,200 ) Derivative warrant liabilities at March 31, 2021 7,068,800 Change in fair value of derivative warrant liabilities 2,576,360 Derivative warrant liabilities at June 30, 2021 9,645,160 Change in fair value of derivative warrant liabilities (2,225,430 ) Derivative warrant liabilities at September 30, 2021 $ 7,419,730 The change in the fair value of the convertible note — related party measured with Level 3 inputs for the three and the nine months ended September 30, 2021 is summarized as follows: Fair Value at January 1, 2021 $ — Initial fair value of convertible note – related party – second quarter 500,000 Change in fair value of convertible note – related party 131,260 Fair Value of convertible note – related party, June 30, 2021 631,260 Initial fair value of convertible note – related party – third quarter 444,694 Change in fair value of convertible note – related party (11,814 ) Fair Value of convertible note – related party, September 30, 2021 $ 1,064,140
Schedule of change in the fair value of the derivative warrant liabilities and fair value of the convertible note - related party measured with Level 3		The following table provides quantitative information regarding Level 3 fair value measurements inputs used by the estimated fair value of warrants that may be issued upon conversion of the Convertible Note at their measurement dates: As of September 30, 2021 As of April 15, 2021 Option term (in years) 0.21 0.55 Stock price $ 1.48 $ 1.38 Volatility 72.0 % 67.5 % Risk-free interest rate 0.05 % 0.04 % Expected dividends — % — %

Nature of Business (Details)

Nature of Business (Details)	Oct. 22, 2021USD ($)$ / sharesshares	Jul. 12, 2021USD ($)vote$ / sharesshares	Jan. 11, 2021USD ($)vote$ / sharesshares	Jul. 22, 2020USD ($)	May 31, 2021USD ($)$ / sharesshares	Sep. 30, 2020USD ($)	Jan. 11, 2021USD ($)vote$ / sharesMonthshares	Dec. 31, 2020USD ($)vote$ / sharesMonthshares		Sep. 30, 2021USD ($)vote$ / sharesMonthshares	Dec. 31, 2020USD ($)vote$ / sharesshares	Nov. 01, 2021USD ($)$ / shares	Dec. 31, 2019$ / shares
Subsidiary, Sale of Stock [Line Items]
Shares Issued, Price Per Share | $ / shares					$ 0.000001
stock price per share | $ / shares								$ 0.000001		$ 0.000001	$ 0.000001		$ 0.000001
Number of shares issued | shares					1,698,088
Aggregate purchase price					$ 50,000,000
Revenues										$ 0	$ 0
Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Numbers of units issued | shares			3,600,000				3,600,000	3,600,000		3,600,000
Shares Issued, Price Per Share | $ / shares			$ 10				$ 10	$ 10		$ 10	$ 10	$ 10
Sale of stock, price per share | $ / shares										$ 10
Deferred underwriting commissions			$ 9,700,000				$ 9,700,000	$ 9,700,000		$ 9,700,000	$ 9,700,000
Payments for investment of cash in Trust Account							$ 276,000,000	$ 276,000,000		$ 276,000,000
Condition for future business combination use of proceeds percentage							80	80		80
Condition for future business combination threshold Percentage Ownership							50	50		50
Condition for future business combination threshold Net Tangible Assets								$ 5,000,001		$ 5,000,001	5,000,001	$ 5,000,001
Redemption limit percentage without prior consent							20	20		20
Obligation to redeem Public Shares if entity does not complete a Business Combination (as a percent)							100.00%	100.00%		100.00%
Months to complete acquisition | Month							24	24		24
Maximum Allowed Dissolution Expenses							$ 100,000	$ 100,000		$ 100,000
Operating bank accounts							2,200,000	161,000		255,000
Working capital			1,300,000				1,300,000	421,000		765,000	421,000
Aggregate purchase price						$ 25,000	25,000	25,000	[1],[2]	1,100,000
Amount borrowed			500,000				500,000
Maximum borrowing capacity of working capital loan										$ 945,000
Convertible note - related party			$ 0				$ 0	$ 0			$ 0
SesHoldingsPte.Ltd [Member]
Subsidiary, Sale of Stock [Line Items]
Share price | $ / shares		$ 10
Earn-out shares | shares		30,000,000
Closing stock trigger price for issuance of earn-out shares. | $ / shares		$ 18
Minimum period of closing stock trigger price for issuance of earn-out shares		1 year
Maximum period of closing stock trigger price for issuance of earn-out shares		5 years
SesHoldingsPte.Ltd [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Sale of stock, price per share | $ / shares	$ 10
SesHoldingsPte.Ltd [Member] | Subsequent Event [Member]
Subsidiary, Sale of Stock [Line Items]
Share price | $ / shares		$ 10
Earn-out shares | shares		29,999,947
Closing stock trigger price for issuance of earn-out shares. | $ / shares		$ 18
SesHoldingsPte.Ltd [Member] | Subsequent Event [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Total consideration		$ 2,810,000,000
Share price | $ / shares		$ 10
Numerator Shares in exchange ratio | shares		281,000,000
Earn-out shares | shares		30,000,000
Closing stock trigger price for issuance of earn-out shares. | $ / shares		$ 18
Minimum period of closing stock trigger price for issuance of earn-out shares		1 year
Maximum period of closing stock trigger price for issuance of earn-out shares		5 years
Forecast [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Numbers of units issued | shares			3,600,000
Amendment No.1 To Original Business Combination Agreement [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
stock price per share | $ / shares										$ 0.0001
Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
stock price per share | $ / shares			$ 0.0001				$ 0.0001	$ 0.0001		$ 0.0001	$ 0.0001
Number of votes per share | vote			1				1	1		1	1
Common Class A [Member] | Subsequent Event [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Number of votes per share | vote		1
Common Class A [Member] | Before domestication | Subsequent Event [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
stock price per share | $ / shares		$ 0.0001
Common stock conversion ratio		1
Warrants conversion ratio		1
Units conversion ratio		1
Common Class A [Member] | After domestication | Subsequent Event [Member]
Subsidiary, Sale of Stock [Line Items]
Number of warrants in a unit | shares		0.33
Common Class A [Member] | After domestication | Subsequent Event [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
stock price per share | $ / shares		$ 0.0001
Number of shares in a unit | shares		1
Common Class A [Member] | Amendment No.1 To Original Business Combination Agreement [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Number of votes per share | vote										10
Common Class B [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
stock price per share | $ / shares			$ 0.0001				$ 0.0001	$ 0.0001		$ 0.0001	$ 0.0001
Number of votes per share | vote										10
Common Class B [Member] | Subsequent Event [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Number of votes per share | vote		10
Common Class B [Member] | Before domestication | Subsequent Event [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
stock price per share | $ / shares		$ 0.0001
Common stock conversion ratio		1
Common Class B [Member] | After domestication | Subsequent Event [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
stock price per share | $ / shares		$ 0.0001
Working capital loans warrant | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Maximum borrowing capacity of working capital loan										$ 1,500,000
IPO [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Numbers of units issued | shares			27,600,000				27,600,000
Shares Issued, Price Per Share | $ / shares			$ 10				$ 10
Number of warrants in a unit | shares			0.33
Proceeds from Issuance Initial Public Offering			$ 276,000,000				$ 276
Number of shares issued | shares								10		10
Deferred underwriting commissions			9,700,000				9,700,000
Other offering costs			$ 15,800,000				$ 15,800,000
Convertible note - related party										$ 945,000
IPO [Member] | Forecast [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Numbers of units issued | shares			27,600,000
Shares Issued, Price Per Share | $ / shares			$ 10				$ 10
Proceeds from Issuance Initial Public Offering			$ 276,000,000
Deferred underwriting commissions			9,700,000				$ 9,700,000
Other offering costs			$ 15,800,000				$ 15,800,000
IPO [Member] | Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Number of shares in a unit | shares			1
Private Placement [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights | shares			5,013,333				5,013,333	5,013,333		5,013,333	5,013,333
Price of warrant | $ / shares			$ 1.50				$ 1.50	$ 1.50		$ 1.50	$ 1.50
Private Placement [Member] | Private Placement Warrants
Subsidiary, Sale of Stock [Line Items]
Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights | shares			5,013,333				5,013,333
Private Placement [Member] | Private Placement Warrants | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights | shares			5,013,333				5,013,333	5,013,333		5,013,333	5,013,333
Price of warrant | $ / shares			$ 1.50				$ 1.50	$ 1.50		$ 1.50	$ 1.50
Proceeds From Issuance Of Warrants							$ 7,500,000	$ 7,500,000		$ 7,500,000
Over-Allotment Option [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Numbers of units issued | shares			3,600,000				3,600,000
PIPE Investors [Member]
Subsidiary, Sale of Stock [Line Items]
Number of shares issued | shares		27,500,000
Sale of stock, price per share | $ / shares		$ 10
Aggregate amount of commitments under Subscription Agreements		$ 275,000
PIPE Investors [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Sale of stock, price per share | $ / shares								$ 10			$ 10
Aggregate amount of commitments under Subscription Agreements	$ 200,000
PIPE Investors [Member] | Subsequent Event [Member]
Subsidiary, Sale of Stock [Line Items]
Number of shares issued | shares	7,500,000	27,450,000
Sale of stock, price per share | $ / shares	$ 10	$ 10
Aggregate purchase price	$ 75,000,000	$ 274,500,000
PIPE Investors [Member] | Subsequent Event [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Number of shares issued | shares		20,000,000
Sale of stock, price per share | $ / shares		$ 10
Aggregate purchase price		$ 200,000,000
Aggregate amount of commitments under Subscription Agreements	275,000
PIPE Investors [Member] | Amendment No.1 To Original Business Combination Agreement [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Aggregate purchase price	$ 75,000,000
PIPE Investors [Member] | Amendment No.1 To Original Business Combination Agreement [Member] | Subsequent Event [Member]
Subsidiary, Sale of Stock [Line Items]
Number of shares issued | shares	27,500,000
Sale of stock, price per share | $ / shares	$ 10
Aggregate purchase price	$ 275,000,000
PIPE Investors [Member] | Common Class A [Member] | SesHoldingsPte.Ltd [Member] | Subsequent Event [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Aggregate purchase price	$ 7,500,000
Sponsor | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Aggregate purchase price				$ 25,000				$ 25,000
Amount borrowed				$ 500,000				$ 500,000			$ 500,000
[1]	Shares and the associated amounts have been retroactively restated to reflect: (i) the surrender of 2,875,000 Class B ordinary shares to the Company for cancellation for no consideration on December 16, 2020; and (ii) the share capitalization of 1,150,000 shares on January 6, 2021, resulting in an aggregate of 6,900,000 Class B ordinary shares outstanding (see Note 6).
[2]	This number excludes an aggregate of up to 900,000 Class B ordinary shares subject to forfeiture if the over-allotment option was not exercised in full or in part by the underwriter. On January 11, 2021, the underwriter exercised its over-allotment option, in full; thus these shares are no longer subject to forfeiture (see Note 6).

Restatement Of Previously Fil_3

Restatement Of Previously Filed Balance Sheet - Schedule of impact of restatement on the balance sheets (Details) - USD ($)	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jan. 11, 2021	Dec. 31, 2020		Sep. 30, 2020	Jul. 07, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Total Assets	$ 197,734,000				$ 24,589,000						$ 36,426,000
Total current liabilities	6,998,000				3,876,000						2,239,000
Total liabilities	7,670,000				4,614,000						2,904,000
Ordinary shares	0				0						0
Additional paid-in capital	1,199,000				836,000						682,000
Accumulated deficit	(81,257,000)				(63,038,000)						(49,149,000)
Total shareholders' equity (deficit)	(79,877,000)	$ (72,036,000)	$ (65,606,000)		(62,069,000)		$ (58,409,000)		$ (55,199,000)	$ (52,258,000)	(48,522,000)	$ (33,898,000)
Total liabilities, Class A ordinary shares subject to possible redemption and shareholders' equity (deficit)	197,734,000				24,589,000						$ 36,426,000
Ivanhoe Capital Acquisition Corp [Member]
Total Assets	277,068,443			$ 278,183,053	574,310
Total current liabilities	251,405			861,057	582,131
Deferred underwriting commissions	9,660,000			9,660,000
Derivative warrant liabilities	20,759,730			22,148,000
Total liabilities	36,219,052			32,669,057	582,131
Preference shares	0			0	690	[1],[2]
Additional paid-in capital				0	24,310
Accumulated deficit	(35,151,299)			(30,486,694)	(32,821)
Total shareholders' equity (deficit)	(35,150,609)	(38,524,727)	(28,079,338)	(30,486,004)	(7,821)		$ 4,767	$ 0
Total liabilities, Class A ordinary shares subject to possible redemption and shareholders' equity (deficit)	277,068,443			278,183,053	574,310
Ivanhoe Capital Acquisition Corp [Member] | Restatement of redeemable common stock as temporary equity
Total Assets		277,467,799	277,256,530
Total liabilities		39,992,526	29,335,868
Accumulated deficit		(38,525,417)	(28,080,028)
Total shareholders' equity (deficit)		(38,524,727)	(28,079,338)
Total liabilities, Class A ordinary shares subject to possible redemption and shareholders' equity (deficit)		277,467,799	277,256,530
Ivanhoe Capital Acquisition Corp [Member] | Previously Reported [Member]
Preference shares
Ivanhoe Capital Acquisition Corp [Member] | Previously Reported [Member] | Restatement of redeemable common stock as temporary equity
Total Assets		277,467,799	277,256,530	278,183,053
Total current liabilities				861,057
Deferred underwriting commissions				9,660,000
Derivative warrant liabilities				0
Total liabilities		39,992,526	29,335,868	10,521,057
Preference shares				0
Additional paid-in capital		13,949,009	3,503,723	5,040,999
Accumulated deficit		(8,950,131)	1,495,258	(41,816)
Total shareholders' equity (deficit)		5,000,003	5,000,002	5,000,006
Total liabilities, Class A ordinary shares subject to possible redemption and shareholders' equity (deficit)		277,467,799	277,256,530	278,183,053
Ivanhoe Capital Acquisition Corp [Member] | Revision of Prior Period, Error Correction, Adjustment [Member]
Derivative warrant liabilities				22,148,000
Total liabilities				22,148,000
Preference shares				0
Additional paid-in capital				(5,040,999)
Accumulated deficit				(30,444,878)
Total shareholders' equity (deficit)				(35,486,010)
Total liabilities, Class A ordinary shares subject to possible redemption and shareholders' equity (deficit)				0
Ivanhoe Capital Acquisition Corp [Member] | Revision of Prior Period, Error Correction, Adjustment [Member] | Restatement of redeemable common stock as temporary equity
Additional paid-in capital		(13,949,009)	(3,503,723)
Accumulated deficit		(29,575,286)	(29,575,286)
Total shareholders' equity (deficit)		(43,524,730)	(33,079,340)
Class A Common Stock Subject to Redemption | Ivanhoe Capital Acquisition Corp [Member]
Class A ordinary shares subject to possible redemption	276,000,000			276,000,000
Class A Common Stock Subject to Redemption | Ivanhoe Capital Acquisition Corp [Member] | Restatement of redeemable common stock as temporary equity
Class A ordinary shares subject to possible redemption		276,000,000	276,000,000	276,000,000
Class A Common Stock Subject to Redemption | Ivanhoe Capital Acquisition Corp [Member] | Previously Reported [Member] | Restatement of redeemable common stock as temporary equity
Class A ordinary shares subject to possible redemption		232,475,270	242,920,660	262,661,990
Class A Common Stock Subject to Redemption | Ivanhoe Capital Acquisition Corp [Member] | Revision of Prior Period, Error Correction, Adjustment [Member] | Restatement of redeemable common stock as temporary equity
Class A ordinary shares subject to possible redemption		43,524,730	33,079,340	13,338,010
Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member]
Ordinary shares	0			0
Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member] | Previously Reported [Member] | Restatement of redeemable common stock as temporary equity
Ordinary shares		435	331	133
Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member] | Revision of Prior Period, Error Correction, Adjustment [Member]
Ordinary shares				(133)
Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member] | Revision of Prior Period, Error Correction, Adjustment [Member] | Restatement of redeemable common stock as temporary equity
Ordinary shares		(435)	(331)
Common Class B [Member] | Ivanhoe Capital Acquisition Corp [Member]
Ordinary shares	$ 690			690	$ 690
Common Class B [Member] | Ivanhoe Capital Acquisition Corp [Member] | Restatement of redeemable common stock as temporary equity
Ordinary shares		690	690
Common Class B [Member] | Ivanhoe Capital Acquisition Corp [Member] | Previously Reported [Member] | Restatement of redeemable common stock as temporary equity
Ordinary shares		$ 690	$ 690	$ 690
[1]	Shares and the associated amounts have been retroactively restated to reflect: (i) the surrender of 2,875,000 Class B ordinary shares to the Company for cancellation for no consideration on December 16, 2020; and (ii) the share capitalization of 1,150,000 shares on January 6, 2021, resulting in an aggregate of 6,900,000 Class B ordinary shares outstanding (see Note 6).
[2]	This number excludes an aggregate of up to 900,000 Class B ordinary shares subject to forfeiture if the over-allotment option was not exercised in full or in part by the underwriter. On January 11, 2021, the underwriter exercised its over-allotment option, in full; thus these shares are no longer subject to forfeiture (see Note 6).

Restatement Of Previously Fil_4

Restatement Of Previously Filed Balance Sheet - Additional Information (Details)	Jan. 11, 2021USD ($)shares
Minimum net intangible assets required to redemption of common stock | $	$ 5,000,001
Public Warrants | IPO [Member]
Number of warrants to purchase shares issued	9,200,000
Private Placement Warrants | Private Placement [Member]
Number of warrants to purchase shares issued	5,013,333

Basis of Presentation and Sum_4

Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($)	1 Months Ended		3 Months Ended			6 Months Ended			9 Months Ended		12 Months Ended
	May 31, 2021	Apr. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2020	Jan. 11, 2021	Dec. 31, 2020		Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Nov. 01, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2018
Unrecognized Tax Benefits							$ 1,467,000				$ 1,467,000	$ 707,000						$ 0
Temporary Equity, Shares Outstanding			36,064,095				29,496,153		36,064,095		29,496,153	29,496,153
Anti-dilutive securities attributable to warrants (in shares)									39,761,487	30,558,132	30,653,949	30,399,853
Minimum net intangible assets required to redemption of common stock						$ 5,000,001
Proceeds from Issuance of Redeemable Convertible Preferred Stock											$ 0	$ 1,125,000
Retained earnings (accumulated deficit)			$ (81,257,000)				$ (63,038,000)		$ (81,257,000)		(63,038,000)	(49,149,000)
Stock Issued During Period, Value, New Issues	$ 50,000,000
Shares Issued, Price Per Share	$ 0.000001
Stock Issued During Period, Shares, New Issues	1,698,088
Impairments of long-lived assets											$ 0	$ 0
Present value of minimum lease payments meets or exceeds fair value of the asset							90.00%				90.00%
Percentage of economic life of the asset,							75.00%				75.00%
Effective Income Tax Rate Reconciliation, Percent			(0.04%)	0.00%					(0.12%)	0.00%	(0.10%)	(0.70%)
Cash, cash equivalents, and short-term investments			$ 180,600,000				$ 14,700,000		$ 180,600,000		$ 14,700,000
Paycheck Protection Program [Member]
Proceeds from Issuance of Long-term Debt		$ 800,000
Prepaid Expenses and Other Current Assets [Member]
Restricted Cash							100,000				$ 100,000	$ 300,000
Patents [Member]
Finite-Lived Intangible Asset, Useful Life											15 years
Maximum [Member]
Effective Income Tax Rate Reconciliation, Percent											50.00%
Ivanhoe Capital Acquisition Corp [Member]
Cash that is insured with federal insurance			250,000			250,000	250,000		250,000		$ 250,000
Cash equivalents			0			0	0		0		0
Unrecognized Tax Benefits			0			0	0		0		0
Unrecognized tax benefits accrued for interest and penalties			0			0	0		0		0
Minimum net intangible assets required to redemption of common stock			5,000,001						5,000,001
Cash held in Trust Account			276,052,152			276,000,000			276,052,152
Retained earnings (accumulated deficit)			$ (35,151,299)			(30,486,694)	(32,821)		(35,151,299)		$ (32,821)
Stock Issued During Period, Value, New Issues					$ 25,000	$ 25,000	$ 25,000	[1],[2]	$ 1,100,000
Shares Issued, Price Per Share			$ 10			$ 10	$ 10		$ 10		$ 10		$ 10
Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member]
Temporary Equity, Shares Outstanding						27,600,000
Anti-dilutive securities attributable to warrants (in shares)									14,213,280
Class A Common Stock Subject to Redemption | Ivanhoe Capital Acquisition Corp [Member]
Temporary Equity, Shares Outstanding			27,600,000			27,600,000	0		27,600,000		0
Shares Issued, Price Per Share			$ 10			$ 10	$ 10		$ 10		$ 10
Redeemable Convertible Preferred Stock [Member]
Temporary Equity, Shares Outstanding			36,064,095	29,496,153	29,496,153		29,496,153		36,064,095	29,496,153	29,496,153	29,496,153		36,064,095	29,496,153	29,496,153	29,496,153	29,263,571
Proceeds from Issuance of Redeemable Convertible Preferred Stock									$ 269,900,000		$ 82,000,000
Temporary Equity, Aggregate Amount of Redemption Requirement							$ 0				$ 0	$ 0
Series D Plus Redeemable Convertible Preferred Stock [Member]
Temporary Equity, Shares Outstanding			1,698,088						1,698,088
Stock Issued During Period, Value, New Issues	$ 50,000,000
Shares Issued, Price Per Share	$ 0.000001
Stock Issued During Period, Shares, New Issues	1,698,088
Series D Redeemable Convertible Preferred Stock [Member]
Temporary Equity, Shares Outstanding			4,869,854						4,869,854
Stock Issued During Period, Value, New Issues		$ 138,500,000
Shares Issued, Price Per Share		$ 0.000001
Stock Issued During Period, Shares, New Issues		4,869,854
[1]	Shares and the associated amounts have been retroactively restated to reflect: (i) the surrender of 2,875,000 Class B ordinary shares to the Company for cancellation for no consideration on December 16, 2020; and (ii) the share capitalization of 1,150,000 shares on January 6, 2021, resulting in an aggregate of 6,900,000 Class B ordinary shares outstanding (see Note 6).
[2]	This number excludes an aggregate of up to 900,000 Class B ordinary shares subject to forfeiture if the over-allotment option was not exercised in full or in part by the underwriter. On January 11, 2021, the underwriter exercised its over-allotment option, in full; thus these shares are no longer subject to forfeiture (see Note 6).

Basis of Presentation and Sum_5

Basis of Presentation and Summary of Significant Accounting Policies - Impact on Balance Sheet (Details) - USD ($)	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jan. 11, 2021	Dec. 31, 2020		Sep. 30, 2020	Jul. 07, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total assets	$ 197,734,000				$ 24,589,000						$ 36,426,000
Total liabilities	7,670,000				4,614,000						2,904,000
Ordinary shares	0				0						0
Additional paid-in capital	1,199,000				836,000						682,000
Retained earnings (accumulated deficit)	(81,257,000)				(63,038,000)						(49,149,000)
Total shareholders' deficit	(79,877,000)	$ (72,036,000)	$ (65,606,000)		(62,069,000)		$ (58,409,000)		$ (55,199,000)	$ (52,258,000)	(48,522,000)	$ (33,898,000)
Total Liabilities, Class A Ordinary Shares Subject to Possible Redemption and Shareholders' Deficit	197,734,000				24,589,000						$ 36,426,000
Ivanhoe Capital Acquisition Corp [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total assets	277,068,443			$ 278,183,053	574,310
Total liabilities	36,219,052			32,669,057	582,131
Preference shares	0			0	690	[1],[2]
Additional paid-in capital				0	24,310
Retained earnings (accumulated deficit)	(35,151,299)			(30,486,694)	(32,821)
Total shareholders' deficit	(35,150,609)	(38,524,727)	(28,079,338)	(30,486,004)	(7,821)		$ 4,767	$ 0
Total Liabilities, Class A Ordinary Shares Subject to Possible Redemption and Shareholders' Deficit	277,068,443			278,183,053	574,310
Ivanhoe Capital Acquisition Corp [Member] | Common Class A [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Ordinary shares	0			0
Ivanhoe Capital Acquisition Corp [Member] | Class A Common Stock Subject to Redemption
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Class A ordinary shares subject to possible redemption	276,000,000			276,000,000
Ivanhoe Capital Acquisition Corp [Member] | Common Class B [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Ordinary shares	$ 690			690	$ 690
Restatement of redeemable common stock as temporary equity | Ivanhoe Capital Acquisition Corp [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total assets		277,467,799	277,256,530
Total liabilities		39,992,526	29,335,868
Retained earnings (accumulated deficit)		(38,525,417)	(28,080,028)
Total shareholders' deficit		(38,524,727)	(28,079,338)
Total Liabilities, Class A Ordinary Shares Subject to Possible Redemption and Shareholders' Deficit		277,467,799	277,256,530
Restatement of redeemable common stock as temporary equity | Ivanhoe Capital Acquisition Corp [Member] | Class A Common Stock Subject to Redemption
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Class A ordinary shares subject to possible redemption		276,000,000	276,000,000	276,000,000
Restatement of redeemable common stock as temporary equity | Ivanhoe Capital Acquisition Corp [Member] | Common Class B [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Ordinary shares		690	690
Previously Reported [Member] | Ivanhoe Capital Acquisition Corp [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Preference shares
Previously Reported [Member] | Restatement of redeemable common stock as temporary equity | Ivanhoe Capital Acquisition Corp [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total assets		277,467,799	277,256,530	278,183,053
Total liabilities		39,992,526	29,335,868	10,521,057
Preference shares				0
Additional paid-in capital		13,949,009	3,503,723	5,040,999
Retained earnings (accumulated deficit)		(8,950,131)	1,495,258	(41,816)
Total shareholders' deficit		5,000,003	5,000,002	5,000,006
Total Liabilities, Class A Ordinary Shares Subject to Possible Redemption and Shareholders' Deficit		277,467,799	277,256,530	278,183,053
Previously Reported [Member] | Restatement of redeemable common stock as temporary equity | Ivanhoe Capital Acquisition Corp [Member] | Common Class A [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Ordinary shares		435	331	133
Previously Reported [Member] | Restatement of redeemable common stock as temporary equity | Ivanhoe Capital Acquisition Corp [Member] | Class A Common Stock Subject to Redemption
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Class A ordinary shares subject to possible redemption		232,475,270	242,920,660	262,661,990
Previously Reported [Member] | Restatement of redeemable common stock as temporary equity | Ivanhoe Capital Acquisition Corp [Member] | Common Class B [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Ordinary shares		690	690	690
Revision of Prior Period, Error Correction, Adjustment [Member] | Ivanhoe Capital Acquisition Corp [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total liabilities				22,148,000
Preference shares				0
Additional paid-in capital				(5,040,999)
Retained earnings (accumulated deficit)				(30,444,878)
Total shareholders' deficit				(35,486,010)
Total Liabilities, Class A Ordinary Shares Subject to Possible Redemption and Shareholders' Deficit				0
Revision of Prior Period, Error Correction, Adjustment [Member] | Ivanhoe Capital Acquisition Corp [Member] | Common Class A [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Ordinary shares				(133)
Revision of Prior Period, Error Correction, Adjustment [Member] | Restatement of redeemable common stock as temporary equity | Ivanhoe Capital Acquisition Corp [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Additional paid-in capital		(13,949,009)	(3,503,723)
Retained earnings (accumulated deficit)		(29,575,286)	(29,575,286)
Total shareholders' deficit		(43,524,730)	(33,079,340)
Revision of Prior Period, Error Correction, Adjustment [Member] | Restatement of redeemable common stock as temporary equity | Ivanhoe Capital Acquisition Corp [Member] | Common Class A [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Ordinary shares		(435)	(331)
Revision of Prior Period, Error Correction, Adjustment [Member] | Restatement of redeemable common stock as temporary equity | Ivanhoe Capital Acquisition Corp [Member] | Class A Common Stock Subject to Redemption
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Class A ordinary shares subject to possible redemption		$ 43,524,730	$ 33,079,340	$ 13,338,010
[1]	Shares and the associated amounts have been retroactively restated to reflect: (i) the surrender of 2,875,000 Class B ordinary shares to the Company for cancellation for no consideration on December 16, 2020; and (ii) the share capitalization of 1,150,000 shares on January 6, 2021, resulting in an aggregate of 6,900,000 Class B ordinary shares outstanding (see Note 6).
[2]	This number excludes an aggregate of up to 900,000 Class B ordinary shares subject to forfeiture if the over-allotment option was not exercised in full or in part by the underwriter. On January 11, 2021, the underwriter exercised its over-allotment option, in full; thus these shares are no longer subject to forfeiture (see Note 6).

Basis of Presentation and Sum_6

Basis of Presentation and Summary of Significant Accounting Policies - Impact on Statement of Cash Flows (Details) - Ivanhoe Capital Acquisition Corp [Member] - Restatement of redeemable common stock as temporary equity - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 30, 2021
Previously Reported [Member]
Supplemental Disclosure of Noncash Financing Activities:
Initial value of Class A ordinary shares subject to possible redemption	$ 240,513,990	$ 240,513,990
Change in value of Class A ordinary shares subject to possible redemption	(8,038,720)	(8,038,720)
Revision of Prior Period, Error Correction, Adjustment [Member]
Supplemental Disclosure of Noncash Financing Activities:
Initial value of Class A ordinary shares subject to possible redemption	(240,513,990)	(240,513,990)
Change in value of Class A ordinary shares subject to possible redemption	$ 8,038,720	$ 8,038,720

Basis of Presentation and Sum_7

Basis of Presentation and Summary of Significant Accounting Policies - Impact on Weighted Average Shares and Earnings Per Share (Details) - USD ($)	3 Months Ended							6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)	$ (7,995,000)	$ (6,629,000)	$ (3,595,000)		$ (3,312,000)	$ (3,041,000)	$ (3,690,000)			$ (18,219,000)	$ (10,043,000)	$ (13,889,000)	$ (14,702,000)
Ivanhoe Capital Acquisition Corp [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)	$ 3,374,118	(10,445,389)	1,528,079	$ (20,233)					$ (32,821)	$ (5,543,192)
Restatement of redeemable common stock as temporary equity | Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)		$ (10,445,389)	$ 1,528,079					$ (8,917,310)
Weighted average ordinary shares outstanding, basic		27,600,000	24,533,333					26,075,138
Weighted average ordinary shares outstanding, diluted		27,600,000	24,533,333					26,075,138
Earnings per ordinary share, basic		$ (0.30)	$ 0.05					$ (0.27)
Earnings per ordinary share, diluted		$ (0.30)	$ 0.05					$ (0.27)
Restatement of redeemable common stock as temporary equity | Common Class B [Member] | Ivanhoe Capital Acquisition Corp [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)		$ (10,445,389)	$ 1,528,079					$ (8,917,310)
Weighted average ordinary shares outstanding, basic		6,900,000	6,800,000					6,850,276
Weighted average ordinary shares outstanding, diluted		6,900,000	6,800,000					6,850,276
Earnings per ordinary share, basic		$ (0.30)	$ 0.05					$ (0.27)
Earnings per ordinary share, diluted		$ (0.30)	$ 0.05					$ (0.27)
Previously Reported [Member] | Restatement of redeemable common stock as temporary equity | Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)		$ (10,445,389)	$ 1,528,079					$ (8,917,310)
Weighted average ordinary shares outstanding, basic		27,600,000	27,600,000					27,600,000
Weighted average ordinary shares outstanding, diluted		27,600,000	27,600,000					27,600,000
Previously Reported [Member] | Restatement of redeemable common stock as temporary equity | Common Class B [Member] | Ivanhoe Capital Acquisition Corp [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)		$ (10,445,389)	$ 1,528,079					$ (8,917,310)
Weighted average ordinary shares outstanding, basic		6,900,000	6,800,000					6,850,276
Weighted average ordinary shares outstanding, diluted		6,900,000	6,800,000					6,850,276
Earnings per ordinary share, basic		$ (1.51)	$ 0.22					$ (1.31)
Earnings per ordinary share, diluted		(1.51)	$ 0.22					$ (1.31)
Revision of Prior Period, Error Correction, Adjustment [Member] | Restatement of redeemable common stock as temporary equity | Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Weighted average ordinary shares outstanding, basic			(3,066,667)					(1,524,862)
Weighted average ordinary shares outstanding, diluted			(3,066,667)					(1,524,862)
Earnings per ordinary share, basic		(0.30)	$ 0.05					$ (0.27)
Earnings per ordinary share, diluted		(0.30)	0.05					(0.27)
Revision of Prior Period, Error Correction, Adjustment [Member] | Restatement of redeemable common stock as temporary equity | Common Class B [Member] | Ivanhoe Capital Acquisition Corp [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Earnings per ordinary share, basic		1.21	(0.17)					1.04
Earnings per ordinary share, diluted		$ 1.21	$ (0.17)					$ 1.04

Basis of Presentation and Sum_8

Basis of Presentation and Summary of Significant Accounting Policies - Net income (loss) per share (Details) - USD ($)		3 Months Ended			6 Months Ended	9 Months Ended		12 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Denominator:
Weighted Average Number of Shares Outstanding, Basic and Diluted		10,258,463		10,245,074		10,249,586	10,245,074	10,245,074	10,223,375
Earnings Per Share, Basic and Diluted		$ (0.78)		$ (0.32)		$ (1.78)	$ (0.98)	$ (1.36)	$ (1.44)
Ivanhoe Capital Acquisition Corp [Member]
Denominator:
Weighted Average Number of Shares Outstanding, Basic and Diluted	[1],[2]				6,000,000
Earnings Per Share, Basic and Diluted					$ (0.01)
Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member]
Numerator:
Allocation of net income (loss)		$ 2,699,294				$ (4,405,422)
Denominator:
Weighted Average Number of Shares Outstanding, Basic and Diluted		27,600,000				26,589,011
Earnings Per Share, Basic and Diluted		$ 0.10				$ (0.17)
Common Class B [Member] | Ivanhoe Capital Acquisition Corp [Member]
Numerator:
Allocation of net income (loss)		$ 674,824	$ (20,233)			$ (1,137,770)
Denominator:
Weighted Average Number of Shares Outstanding, Basic and Diluted		6,900,000	6,000,000			6,867,033
Earnings Per Share, Basic and Diluted		$ 0.10	$ 0			$ (0.17)
[1]	Shares and the associated amounts have been retroactively restated to reflect: (i) the surrender of 2,875,000 Class B ordinary shares to the Company for cancellation for no consideration on December 16, 2020; and (ii) the share capitalization of 1,150,000 shares on January 6, 2021, resulting in an aggregate of 6,900,000 Class B ordinary shares outstanding (see Note 6).
[2]	This number excludes an aggregate of up to 900,000 Class B ordinary shares subject to forfeiture if the over-allotment option was not exercised in full or in part by the underwriter. On January 11, 2021, the underwriter exercised its over-allotment option, in full; thus these shares are no longer subject to forfeiture (see Note 6).

Basis of Presentation and Sum_9

Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Estimated Useful Lives of the Assets (Details)	12 Months Ended
	Dec. 31, 2020
Laboratory machinery and equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	5 years
Laboratory machinery and equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	10 years
Office and computer equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	3 years
Office and computer equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	5 years
Furniture and Fixtures [Member]
Property, Plant and Equipment, Useful Life	5 years
Leasehold Improvements [Member]
Property Plant and Equipment Useful Life	Shorter of useful life or lease term

Cash, Cash Equivalents, and R_3

Cash, Cash Equivalents, and Restricted Cash - Schedule of Cash, Cash Equivalents Restricted Cash and Restricted Cash Equivalents (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Line Items]
Cash	$ 25,098	$ 1,335		$ 201
Cash equivalents:
Money market funds	4,995	1,104		25,198
Restricted cash:
Certificates of deposit	475	217		289
Total cash, cash equivalents, and restricted cash	30,640	2,728	$ 4,896	25,982	$ 43,782
Certificates of Deposit
Restricted cash:
Certificates of deposit	$ 547	$ 289		$ 583

Cash, Cash Equivalents, and R_4

Cash, Cash Equivalents, and Restricted Cash - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Prepaid Expenses and Other Current Assets [Member]
Cash and Cash Equivalents [Line Items]
Restricted Cash, Current	$ 0.5	$ 0.1

Initial Public Offering (Detail

Initial Public Offering (Details) - USD ($)	Jan. 11, 2021	Jan. 11, 2021	Dec. 31, 2020	Sep. 30, 2021	Nov. 01, 2021	May 31, 2021
Subsidiary, Sale of Stock [Line Items]
Shares Issued, Price Per Share						$ 0.000001
Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Numbers of units issued	3,600,000	3,600,000	3,600,000	3,600,000
Shares Issued, Price Per Share	$ 10	$ 10	$ 10	$ 10	$ 10
Offering cost			$ 245,462	$ 5,710,734
Exercise price of warrants	$ 11.50	$ 11.50	$ 11.50	$ 11.50
IPO [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Numbers of units issued	27,600,000	27,600,000
Shares Issued, Price Per Share	$ 10	$ 10
Gross proceeds	$ 276,000,000
Offering cost	15,800,000
Deferred underwriting commissions	$ 9,700,000	$ 9,700,000
Number of warrants in a unit	0.33
IPO [Member] | Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Number of shares in a unit	1
Number of shares issuable per warrant	1	1
Exercise price of warrants	$ 11.50	$ 11.50
Over-Allotment Option [Member] | Ivanhoe Capital Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Numbers of units issued	3,600,000	3,600,000

Fair Value Measurements - Compa

Fair Value Measurements - Company's financial assets and liabilities (Details) - USD ($)	Sep. 30, 2021	Jun. 30, 2021	Jan. 11, 2021	Dec. 31, 2020	Dec. 31, 2019
Short-term investments:
Assets, Fair Value Disclosure	$ 155,542,000			$ 13,684,000
Short-term Investments [Member] | Corporate Debt Securities [Member]
Short-term investments:
Investments held in Trust Account				4,299,000
Short-term Investments [Member] | Mutual Fund [Member]
Short-term investments:
Investments held in Trust Account				7,992,000
Short-term Investments [Member] | Bank Time Deposits [Member]
Short-term investments:
Investments held in Trust Account	150,000,000
Ivanhoe Capital Acquisition Corp [Member]
Liabilities, Fair Value Disclosure [Abstract]
Derivative warrant liabilities	20,759,730		$ 22,148,000
Convertible note - related party	1,064,140
Fair Value, Recurring [Member]
Assets:
Restricted cash	547,000			289,000	$ 583,000
Short-term investments:
Assets, Fair Value Disclosure				13,684,000	25,781,000
Fair Value, Recurring [Member] | Money Market Funds [Member]
Assets:
Cash equivalents in money market funds	4,995,000			1,104,000	25,198,000
Fair Value, Recurring [Member] | Short-term Investments [Member] | Corporate Debt Securities [Member]
Short-term investments:
Investments held in Trust Account				4,299,000
Fair Value, Recurring [Member] | Short-term Investments [Member] | Mutual Fund [Member]
Short-term investments:
Investments held in Trust Account				7,992,000
Fair Value, Recurring [Member] | Ivanhoe Capital Acquisition Corp [Member]
Short-term investments:
Assets, Fair Value Disclosure				0
Fair Value, Inputs, Level 1 [Member]
Short-term investments:
Assets, Fair Value Disclosure	4,995,000			1,104,000
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | Corporate Debt Securities [Member]
Short-term investments:
Investments held in Trust Account				0
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | Mutual Fund [Member]
Short-term investments:
Investments held in Trust Account				0
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | Bank Time Deposits [Member]
Short-term investments:
Investments held in Trust Account	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Assets:
Restricted cash	0			0	0
Short-term investments:
Assets, Fair Value Disclosure				1,104,000	25,198,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Money Market Funds [Member]
Assets:
Cash equivalents in money market funds	4,995,000			1,104,000	25,198,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Short-term Investments [Member] | Corporate Debt Securities [Member]
Short-term investments:
Investments held in Trust Account				0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Short-term Investments [Member] | Mutual Fund [Member]
Short-term investments:
Investments held in Trust Account				0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Ivanhoe Capital Acquisition Corp [Member]
Short-term investments:
Investments held in Trust Account	276,052,152
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Public Warrants | Ivanhoe Capital Acquisition Corp [Member]
Liabilities, Fair Value Disclosure [Abstract]
Derivative warrant liabilities	13,340,000
Level 2
Short-term investments:
Assets, Fair Value Disclosure	150,547,000			12,580,000
Level 2 | Short-term Investments [Member] | Corporate Debt Securities [Member]
Short-term investments:
Investments held in Trust Account				4,299,000
Level 2 | Short-term Investments [Member] | Mutual Fund [Member]
Short-term investments:
Investments held in Trust Account				7,992,000
Level 2 | Short-term Investments [Member] | Bank Time Deposits [Member]
Short-term investments:
Investments held in Trust Account	150,000,000
Level 2 | Fair Value, Recurring [Member]
Assets:
Restricted cash	547,000			289,000	583,000
Short-term investments:
Assets, Fair Value Disclosure				12,580,000	583,000
Level 2 | Fair Value, Recurring [Member] | Money Market Funds [Member]
Assets:
Cash equivalents in money market funds	0			0	0
Level 2 | Fair Value, Recurring [Member] | Short-term Investments [Member] | Corporate Debt Securities [Member]
Short-term investments:
Investments held in Trust Account				4,299,000
Level 2 | Fair Value, Recurring [Member] | Short-term Investments [Member] | Mutual Fund [Member]
Short-term investments:
Investments held in Trust Account				7,992,000
Fair Value, Inputs, Level 3 [Member]
Short-term investments:
Assets, Fair Value Disclosure	0			0
Fair Value, Inputs, Level 3 [Member] | Short-term Investments [Member] | Corporate Debt Securities [Member]
Short-term investments:
Investments held in Trust Account				0
Fair Value, Inputs, Level 3 [Member] | Short-term Investments [Member] | Mutual Fund [Member]
Short-term investments:
Investments held in Trust Account				0
Fair Value, Inputs, Level 3 [Member] | Short-term Investments [Member] | Bank Time Deposits [Member]
Short-term investments:
Investments held in Trust Account	0
Fair Value, Inputs, Level 3 [Member] | Ivanhoe Capital Acquisition Corp [Member]
Liabilities, Fair Value Disclosure [Abstract]
Convertible note - related party	1,064,140	$ 631,260		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Assets:
Restricted cash	0			0	0
Short-term investments:
Assets, Fair Value Disclosure				0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Money Market Funds [Member]
Assets:
Cash equivalents in money market funds	0			0	$ 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Short-term Investments [Member] | Corporate Debt Securities [Member]
Short-term investments:
Investments held in Trust Account				0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Short-term Investments [Member] | Mutual Fund [Member]
Short-term investments:
Investments held in Trust Account				$ 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Ivanhoe Capital Acquisition Corp [Member]
Liabilities, Fair Value Disclosure [Abstract]
Convertible note - related party	1,064,140
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Public Warrants | Ivanhoe Capital Acquisition Corp [Member]
Liabilities, Fair Value Disclosure [Abstract]
Derivative warrant liabilities			14,628,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Private Placement Warrants | Ivanhoe Capital Acquisition Corp [Member]
Liabilities, Fair Value Disclosure [Abstract]
Derivative warrant liabilities	$ 7,419,730		$ 7,520,000

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assets	$ 155,542,000	$ 155,542,000	$ 13,684,000
Ivanhoe Capital Acquisition Corp [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assets level 1 to level 2 transfers	0	0
Fair value assets level 2 to level 1 transfers	0	0
Fair value assets transferred into (out of) level 3	$ 0	$ 0
Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assets			13,684,000	$ 25,781,000
Fair Value, Recurring [Member] | Ivanhoe Capital Acquisition Corp [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assets			0
Fair value liabilities			$ 0

Fair Value Measurements - Level

Fair Value Measurements - Level 3 Fair Value Measurements Inputs (Details) - Fair Value, Inputs, Level 3 [Member] - Ivanhoe Capital Acquisition Corp [Member]	Sep. 30, 2021yr	Apr. 15, 2021yr	Jan. 11, 2021d
Measurement Input, Expected Term [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements inputs at their measurement	5.09		6.47
Fair value measurements inputs used by the estimated fair value of warrants | yr	0.21	0.55
Measurement Input, Share Price [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements inputs at their measurement	9.90		9.91
Fair value measurements inputs used by the estimated fair value of warrants	1.48	1.38
Measurement Input, Price Volatility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements inputs at their measurement	21.1		14
Fair value measurements inputs used by the estimated fair value of warrants	72	67.5
Measurement Input, Risk Free Interest Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements inputs at their measurement	0.99		0.75
Fair value measurements inputs used by the estimated fair value of warrants	0.05	0.04
Expected dividends
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements inputs at their measurement | d			0

Fair Value Measurements - Chang

Fair Value Measurements - Change in the Fair Value of the Warrant Liabilities (Details) - Ivanhoe Capital Acquisition Corp [Member] - USD ($)	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Derivative warrant liabilities beginning of the period	$ 9,645,160	$ 7,068,800
Change in fair value of derivative warrant liabilities	(2,225,430)	2,576,360	$ (451,200)
Derivative warrant liabilities ending of the period	$ 7,419,730	$ 9,645,160	7,068,800
Fair Value, Inputs, Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Derivative warrant liabilities beginning of the period			0
Issuance of Public and Private Warrants			22,148,000
Transfer of Public Warrants to Level 1 measurement			$ (14,628,000)

Fair Value Measurements - Cha_2

Fair Value Measurements - Change in the Fair Value of the Convertible note - related party (Details) - Ivanhoe Capital Acquisition Corp [Member] - USD ($)	3 Months Ended	6 Months Ended	9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Change in fair value of convertible note - related party	$ (11,814)		$ 119,446
Fair Value of convertible note - related party, end of period	1,064,140		1,064,140
Fair Value, Inputs, Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value at January 1, 2021	631,260	$ 0	0
Initial fair value of convertible note - related party	444,694	500,000
Change in fair value of convertible note - related party	(11,814)	131,260
Fair Value of convertible note - related party, end of period	$ 1,064,140	$ 631,260	$ 1,064,140

Property And Equipment, Net - P

Property And Equipment, Net - Property Plant And Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, Gross		$ 9,830	$ 9,397
Less: Accumulated depreciation		(3,786)	(2,212)
Property and equipment, net	$ 5,656	6,044	7,185
Laboratory Machinery And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross		6,227	5,878
Office And Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross		234	213
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross		$ 3,369	$ 3,306

Property And Equipment, Net - A

Property And Equipment, Net - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Depreciation	$ 1.6	$ 0.9

Intangible Assets, net - Schedu

Intangible Assets, net - Schedule of Intangible assets net (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Less: Accumulated amortization		$ (190)	$ (62)
Total	$ 1,632	1,728	1,856
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets		$ 1,918	$ 1,918

Intangible Assets, net - Sche_2

Intangible Assets, net - Schedule of The Estimated Future Amortization Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
2021		$ 128
2022		128
2023		128
2024		128
2025		128
Thereafter		1,088
Total	$ 1,632	$ 1,728	$ 1,856

Intangible Assets, net - Additi

Intangible Assets, net - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
Amortization of Intangible Assets		$ 0.1	$ 0.1
Patents [Member]
Finite-lived Intangible Assets Acquired	$ 1.9
Finite-Lived Intangible Asset, Useful Life		15 years

Accrued compensation, Accrued_3

Accrued compensation, Accrued Expenses And Other Current Liabilities - Employee Related Liabilities Current (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Accrued bonus	$ 1,014	$ 1,068	$ 441
Other	995	148	145
Accrued compensation	$ 2,009	$ 1,216	$ 586

Accrued compensation, Accrued_4

Accrued compensation, Accrued Expenses And Other Current Liabilities - Accrued Liabilities And Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Payables And Accruals [Line Items]
Deferred rent liabilities	$ 239	$ 231	$ 153
Accrual related to purchase of property and equipment		69	334
Payments received under joint development agreements	136	160
Accrued professional services	403
Income taxes payable	137	115	108
Other	437	282	418
Accrued expenses and other current liabilities	$ 1,352	788	$ 1,013
Previously Reported [Member]
Payables And Accruals [Line Items]
Other		$ 373

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) $ / shares in Units, $ in Thousands	Jan. 11, 2021USD ($)Day$ / sharesshares	May 31, 2020	Sep. 30, 2018	Aug. 31, 2016	Sep. 30, 2021USD ($)item$ / shares	Mar. 31, 2021USD ($)	Sep. 30, 2021USD ($)item$ / shares	Sep. 30, 2020USD ($)	Sep. 30, 2020	Jan. 11, 2021USD ($)Day$ / sharesshares	Dec. 31, 2020USD ($)item$ / sharesshares	Sep. 30, 2021USD ($)item$ / sharesshares	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)item$ / shares	Dec. 31, 2019USD ($)
Operating leases, rent expense							$ 500	$ 300				$ 1,200	$ 900	$ 1,300	$ 1,100
Standby Letters of Credit [Member]
Line of credit facility, maximum borrowing capacity											$ 300			300	$ 600
Proceeds from lines of credit														0
Office Building [Member] | Woburn Massachusetts [Member]
Lessee operating lease expiration term month and year				2021-08
Lessee, operating lease, renewal term				5 years
Lessee operating lease renewal option month and year				2026-08
Lessee, operating lease, option to extend		In May 2020, the Company extended the term of the lease by 5 years through August 2026
Lessee operating lease extended term		5 years
Lessee operating lease extended term month and year		2026-08
Lessee operating lease annual rental payment per lease														$ 800
Percentage of increase in annual cost of living determining annual rental payment per lease														3.00%
Office Building [Member] | Woburn Massachusetts [Member] | Amended Lease [Member] | Maximum [Member]
Operating Leases, Rent Expense, Minimum Rentals						$ 1,500
Percentage of increase in annual cost of living determining total base rental payments						3.00%
Office Building [Member] | Woburn Massachusetts [Member] | Amended Lease [Member] | Minimum [Member]
Operating Leases, Rent Expense, Minimum Rentals						$ 800
Manufacturing Facility [Member] | Shanghai China [Member]
Lessee operating lease expiration term month and year			2023-08
Lessee operating lease annual rental payment per lease														$ 600
Percentage of increase in annual cost of living determining annual rental payment per lease														3.00%
Number of days before expiry within which application for renewal shall be provided			90 days
Manufacturing Facility [Member] | Shanghai China [Member] | Amended Lease [Member]
Lessee operating lease renewal option month and year			2026-08
Manufacturing Facility [Member] | Shanghai China [Member] | Amended Lease [Member] | Maximum [Member]
Operating Leases, Rent Expense, Minimum Rentals					$ 1,300
Ivanhoe Capital Acquisition Corp [Member]
Maximum number of demands for registration of securities	3				3		3			3	3	3		3
Numbers of units issued | shares	3,600,000									3,600,000	3,600,000	3,600,000
Granted the underwriters									45 days	45 days		45 days
Underwriting cash discount per unit | $ / shares										$ 0.20	$ 0.20	$ 0.20
Underwriter cash discount										$ 5,500	$ 5,500	$ 5,500
Deferred fee per unit | $ / shares	$ 0.35				$ 0.35		$ 0.35			$ 0.35	$ 0.35	$ 0.35		$ 0.35
Deferred underwriting fee payable	$ 9,700				$ 9,700		$ 9,700			$ 9,700	$ 9,700	$ 9,700		$ 9,700

Commitments and Contingencies_2

Commitments and Contingencies - Summary of Deferred Rent (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Deferred Rent [Line Items]
Deferred rent included in accrued expenses and other current liabilities	$ 239	$ 231	$ 153
Deferred rent included in other liabilities	537	607	541
Total deferred rent	$ 776	$ 838	$ 694

Commitments and Contingencies_3

Commitments and Contingencies - Summary of Future Minimum Operating Lease Payments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Remainder of 2021	$ 358
2021		$ 1,408
2022	2,696	1,390
2023	2,449	1,111
2024	2,188	823
2025	2,235	837
Thereafter	1,389	567
Total future minimum lease payments	$ 11,315	$ 6,136

Redeemable Convertible Prefer_3

Redeemable Convertible Preferred Stock - Schedule of Redeemable Convertible Preferred Stock Issued and Outstanding (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Shares Authorized	36,064,095	29,496,153	29,496,153
Shares Issued and Outstanding	36,064,095	29,496,153	29,496,153
Liquidation Amount	$ 271,148	$ 82,643	$ 82,643
Carrying Amount	$ 269,941	$ 82,044	$ 82,044
Series A Redeemable convertible preferred stock [Member]
Issue Price per share	$ 0.8340	$ 0.8340	$ 0.8340
Shares Authorized	5,395,685	5,395,685	5,395,685
Shares Issued and Outstanding	5,395,685	5,395,685	5,395,685
Liquidation Amount	$ 4,500	$ 4,500	$ 4,500
Carrying Amount	$ 4,413	$ 4,413	$ 4,413
Series B Redeemable convertible preferred stock [Member]
Issue Price per share	$ 2.2513	$ 2.2513	$ 2.2513
Shares Authorized	5,108,073	5,108,073	5,108,073
Shares Issued and Outstanding	5,108,073	5,108,073	5,108,073
Liquidation Amount	$ 11,500	$ 11,500	$ 11,500
Carrying Amount	$ 11,362	$ 11,362	$ 11,362
Series C Redeemable convertible preferred stock [Member]
Issue Price per share	$ 2.8652	$ 2.8652	$ 2.8652
Shares Authorized	12,789,050	12,789,050	12,789,050
Shares Issued and Outstanding	12,789,050	12,789,050	12,789,050
Liquidation Amount	$ 36,643	$ 36,643	$ 36,643
Carrying Amount	$ 36,324	$ 36,324	$ 36,324
Series C plus redeemable convertible preferred stock [Member]
Issue Price per share	$ 4.8361	$ 4.8361	$ 4.8361
Shares Authorized	6,203,345	6,203,345	6,203,345
Shares Issued and Outstanding	6,203,345	6,203,345	6,203,345
Liquidation Amount	$ 30,000	$ 30,000	$ 30,000
Carrying Amount	$ 29,945	$ 29,945	$ 29,945
Series D Redeemable Convertible Preferred Stock [Member]
Issue Price per share	$ 28.4413
Shares Authorized	4,869,854
Shares Issued and Outstanding	4,869,854
Liquidation Amount	$ 138,505
Carrying Amount	$ 138,257
Series D Plus Redeemable Convertible Preferred Stock [Member]
Issue Price per share	$ 29.4449
Shares Authorized	1,698,088
Shares Issued and Outstanding	1,698,088
Liquidation Amount	$ 50,000
Carrying Amount	$ 49,640

Redeemable Convertible Prefer_4

Redeemable Convertible Preferred Stock - Additional Information (Detail) - USD ($)	Jul. 31, 2019	Nov. 06, 2018	May 31, 2021	Apr. 30, 2021	Apr. 30, 2020	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock Issued During Period, Shares, New Issues			1,698,088
Shares Issued, Price Per Share			$ 0.000001
Stock Issued During Period, Value, New Issues			$ 50,000,000
Dividends, Preferred Stock						$ 0	$ 0	$ 0
Series A Redeemable convertible preferred stock [Member]
Preferred Stock, Convertible, Conversion Price						$ 0.8340	$ 0.8340
Series B Redeemable convertible preferred stock [Member]
Preferred Stock, Convertible, Conversion Price						2.2513	$ 2.2513
Series C Redeemable convertible preferred stock [Member]
Proceeds from Issuance of Common Stock							$ 100,000,000
Preferred Stock, Convertible, Conversion Price						2.8652	$ 2.8652
Series C plus redeemable convertible preferred stock [Member]
Stock Issued During Period, Shares, New Issues	232,582	5,970,763
Shares Issued, Price Per Share		$ 0.000001
Share Price		$ 4.8361
Stock Issued During Period, Value, New Issues	$ 1,100,000	$ 28,900,000
Preferred Stock, Convertible, Conversion Price						4.8361	$ 4.8361
Series D Redeemable Convertible Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues					4,869,854
Shares Issued, Price Per Share					$ 0.000001
Stock Issued During Period, Value, New Issues					$ 138,500,000
Preferred Stock, Convertible, Conversion Price						28.4413
Series D Redeemable Convertible Preferred Stock [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues				4,869,854
Shares Issued, Price Per Share				$ 0.000001
Stock Issued During Period, Value, New Issues				$ 138,500,000
Series D Plus Redeemable Convertible Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues			1,698,088
Shares Issued, Price Per Share			$ 0.000001
Stock Issued During Period, Value, New Issues			$ 50,000,000
Preferred Stock, Convertible, Conversion Price						$ 29.4449
Series D Plus Redeemable Convertible Preferred Stock [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues			1,698,088
Shares Issued, Price Per Share			$ 0.000001
Stock Issued During Period, Value, New Issues			$ 50,000,000
Series D And SeriesD plus Redeemable convertible preferred stock [Member]
Proceeds from Issuance of Common Stock						$ 100,000,000
Redeemable Convertible Preferred Stock [Member]
Percentage of conversion from the holders of the redeemable convertible preferred stock an as-converted basis							66.00%

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Mar. 30, 2021	Dec. 31, 2018	May 03, 2013
Disclosure Of Compensation Related Costs Share Based Payments [Line Items]
Number of shares of common stock reserved for future issuance under the plan	40,252,490		33,218,139	33,218,139
Options vesting rights	generally vest 25% upon completion of one year of service and 1/48 per month thereafter, however in certain instances options have been granted with immediate vesting		Generally, options granted will vest 25% upon completion of one year of service and 1/48 per month thereafter; however, in certain instances options have been granted with immediate vesting.
Options vesting rights percentage	25.00%		25.00%
Options expiration period from the date of grant	10 years		10 years
Weighted average grant date fair value per share of options granted	$ 0.93	$ 0.47	$ 0.48	$ 0.51
Total grant date fair value of options vested	$ 0	$ 0	$ 204,000	$ 47,000
Unrecognized stock based compensation cost	$ 1,300	$ 100	$ 200
Estimated weighted average period	3 years 3 months 18 days	1 year 9 months 18 days	2 years 6 months
Number of shares available for future grants	491,003	2,660,007	2,564,190	2,818,286		2,982,792
Subsequent Event [Member]
Disclosure Of Compensation Related Costs Share Based Payments [Line Items]
Number of shares available for future grants	491,003
2013 Plan
Disclosure Of Compensation Related Costs Share Based Payments [Line Items]
Number of shares of common stock reserved for future issuance under the plan							3,721,986
2018 Plan
Disclosure Of Compensation Related Costs Share Based Payments [Line Items]
Number of shares of common stock reserved for future issuance under the plan			2,564,190
2021 Plan
Disclosure Of Compensation Related Costs Share Based Payments [Line Items]
Number of shares of common stock reserved for future issuance under the plan					486,975

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary Of Stock Option plan Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Available for Grant, Beginning Balance	2,564,190	2,818,286	2,818,286	2,982,792
Number of Shares Available for Grant, Additional shares authorized	486,975
Number of Shares Available for Grant, Options granted	(2,587,516)	(188,920)	(287,720)	(537,200)
Number of Shares Available for Grant, Options exercised		0	0	0
Number of Shares Available for Grant, Options cancelled and forfeited	27,354	30,641	33,624	372,694
Number of Shares Available for Grant, Ending Balance	491,003	2,660,007	2,564,190	2,818,286	2,982,792
Number of Shares Underlying Outstanding Options, Beginning Balance	1,157,769	903,700	903,700	779,166
Number of Shares Underlying Outstanding Options, Options granted	2,587,516	188,920	287,720	537,200
Number of Shares Underlying Outstanding Options, Options exercised	(20,539)	0	0	(40,000)
Number of Shares Underlying Outstanding Options, Options cancelled and forfeited	(27,354)	(30,641)	(33,651)	(372,666)
Number of Shares Underlying Outstanding Options, Ending Balance	3,697,392	1,061,979	1,157,769	903,700	779,166
Number of Shares Underlying Outstanding Options, Vested and expected to vest	3,697,392	1,061,979	1,157,769	903,700
Number of Shares Underlying Outstanding Options, Exercisable	867,272	751,267	701,122	260,205
Weighted- Average Exercise Price per Share, Beginning Balance	$ 0.72	$ 0.69	$ 0.69	$ 0.44
Weighted- Average Exercise Price per Share, Options granted	1	0.82	0.81	0.87
Weighted- Average Exercise Price per Share, Options exercised	0.69	0		0.41
Weighted- Average Exercise Price per Share, Options cancelled and forfeited	0.65	0.82	0.75	0.45
Weighted- Average Exercise Price per Share, Ending Balance	0.92	0.71	0.72	0.69	$ 0.44
Weighted- Average Exercise Price per Share, Vested and expected to vest	0.92	0.71	0.72	0.69
Weighted- Average Exercise Price per Share, Exercisable	$ 0.70	$ 0.68	$ 0.66	$ 0.45
Weighted- Average Remaining Contractual Term (in years)	8 years 8 months 12 days	7 years 10 months 24 days	7 years 9 months 18 days	8 years 4 months 24 days	7 years
Weighted- Average Remaining Contractual Term (in years), Vested and expected to vest	8 years 8 months 12 days	7 years 10 months 24 days	7 years 9 months 18 days	8 years 4 months 24 days
Weighted- Average Remaining Contractual Term (in years), Exercisable	6 years 9 months 18 days	7 years 8 months 12 days	7 years 4 months 24 days	7 years
Aggregate Intrinsic Value, Beginning Balance	$ 243	$ 138	$ 138	$ 336
Aggregate Intrinsic Value, Options exercised				18
Aggregate Intrinsic Value, Ending Balance	231	135	243	138	$ 336
Aggregate Intrinsic Value, Vested and expected to vest	231	135	243	138
Aggregate Intrinsic Value, Exercisable	$ 202	$ 112	$ 187	$ 94

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule Of Stock Based Compensation included in its consolidated statements of operations and comprehensive loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation	$ 157	$ 20	$ 343	$ 134	$ 154	$ 123
Research and Development Expense [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation	34	6	89	66	72	37
General and Administrative Expense [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation	$ 123	$ 14	$ 254	$ 68	$ 82	$ 86

Stock-Based Compensation - Sc_2

Stock-Based Compensation - Schedule Of Fair Value Of the Employee Stock Options Calculated Using Black scholes Option Pricing Models based on Valuation Assumptions (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	6 years 29 days	6 years 29 days	6 years 29 days
Risk-free interest rate		0.37%
Risk-free interest rate, minimum	0.85%		0.64%	0.26%	0.40%	1.60%
Risk-free interest rate, maximum	0.98%		1.13%	0.94%	0.90%	2.50%
Expected volatility		64.43%
Expected volatility, minimum	69.28%		67.99%	61.76%	61.80%	61.80%
Expected volatility, maximum	69.31%		69.33%	68.43%	67.50%	62.70%
Expected dividend rate	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)				2 years 6 months	5 years	6 years 1 month 6 days
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)				6 years 29 days	6 years 1 month 6 days	6 years 1 month 6 days

Shareholders' Equity (Deficit_2

Shareholders' Equity (Deficit) - Preferred Stock Shares (Details) - $ / shares	Sep. 30, 2021	Jan. 11, 2021	Dec. 31, 2020
Preferred shares, shares authorized	36,064,095		29,496,153
Preferred stock, par value, (per share)	$ 0.000001		$ 0.000001
Ivanhoe Capital Acquisition Corp [Member]
Preferred shares, shares authorized	1,000,000	1,000,000	1,000,000
Preferred stock, par value, (per share)	$ 0.0001	$ 0.0001	$ 0.0001
Preferred shares, shares issued	0	0	0
Preferred shares, shares outstanding	0	0	0

Shareholders' Equity (Deficit_3

Shareholders' Equity (Deficit) - Common stock (Details)	Jan. 11, 2021vote$ / sharesshares	Jan. 06, 2021shares	Dec. 16, 2020shares	Dec. 31, 2020vote$ / sharesshares	Sep. 30, 2021USD ($)vote$ / sharesshares	Dec. 31, 2020USD ($)vote$ / sharesshares	Jul. 22, 2020shares	Dec. 31, 2019$ / sharesshares
Class of Stock [Line Items]
Common shares, shares authorized (in shares)				45,000,000	45,000,000	45,000,000		39,000,000
Common shares, par value (in dollars per share) | $ / shares				$ 0.000001	$ 0.000001	$ 0.000001		$ 0.000001
Common shares, shares issued (in shares)				10,245,074	10,265,613	10,245,074		10,245,074
Common stock, shares outstanding				10,245,074	10,265,613	10,245,074		10,245,074
Class A common stock subject to possible redemption, outstanding (in shares)				29,496,153	36,064,095	29,496,153		29,496,153
Aggregate Of Sponsor Shares Surrendered			2,875,000
Dividends declared | $					$ 0	$ 0
Common stock voting rights					one vote	one vote
Ivanhoe Capital Acquisition Corp [Member]
Class of Stock [Line Items]
Aggregate Of Sponsor Shares Surrendered	900,000
Temporary Equity, Shares Issued		1,150,000
Convertible Stock Conversion Ratio		20		20
Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member]
Class of Stock [Line Items]
Common shares, shares authorized (in shares)	200,000,000			200,000,000	200,000,000	200,000,000
Common shares, par value (in dollars per share) | $ / shares	$ 0.0001			$ 0.0001	$ 0.0001	$ 0.0001
Common Stock, Number Of Votes Per Share | vote	1			1	1	1
Common shares, shares issued (in shares)	0			0	27,600,000	0
Common stock, shares outstanding	0			0	27,600,000	0
Class A common stock subject to possible redemption, outstanding (in shares)	27,600,000
Class A Common Stock Subject to Redemption | Ivanhoe Capital Acquisition Corp [Member]
Class of Stock [Line Items]
Class A common stock subject to possible redemption, outstanding (in shares)	27,600,000			0	27,600,000	0
Temporary Equity, Shares Issued	27,600,000			0	27,600,000	0
Common Class B [Member] | Ivanhoe Capital Acquisition Corp [Member]
Class of Stock [Line Items]
Common shares, shares authorized (in shares)	20,000,000			20,000,000	20,000,000	20,000,000
Common shares, par value (in dollars per share) | $ / shares	$ 0.0001			$ 0.0001	$ 0.0001	$ 0.0001
Common Stock, Number Of Votes Per Share | vote					10
Common shares, shares issued (in shares)	6,900,000			6,900,000	6,900,000	6,900,000	8,625,000
Common stock, shares outstanding	6,900,000	6,900,000		6,900,000	6,900,000	6,900,000
Class A common stock subject to possible redemption, outstanding (in shares)		6,900,000
Aggregate Of Sponsor Shares Surrendered			2,875,000
Temporary Equity, Shares Issued		1,150,000
Number Of Shares Subject To Forfeiture		900,000		900,000		900,000
Common Class B [Member] | Ivanhoe Capital Acquisition Corp [Member] | Over-Allotment Option
Class of Stock [Line Items]
Number Of Shares Subject To Forfeiture	900,000

Shareholders' Equity (Deficit_4

Shareholders' Equity (Deficit) - Warrants (Details)	6 Months Ended		9 Months Ended
	Jan. 11, 2021Day$ / shares	Dec. 31, 2020Day$ / shares	Sep. 30, 2021Day$ / shares
Class of Stock [Line Items]
Minimum threshold written notice period for redemption of public warrants	30 days
Ivanhoe Capital Acquisition Corp [Member]
Class of Stock [Line Items]
Public Warrants exercisable term after the completion of a business combination	30 days	30 days	30 days
Public Warrants exercisable term from the closing of the initial public offering	12 months	12 months	12 months
Maximum period after business combination in which to file registration statement		15 days	15 days
Period of time within which registration statement is expected to become effective	60 days	60 days	60 days
Exercise price of warrants	$ 11.50	$ 11.50	$ 11.50
Public Warrants expiration term	5 years	5 years	5 years
Threshold issue price per share	$ 9.20	$ 9.20	$ 9.20
Percentage of gross proceeds on total equity proceeds	60.00%	60.00%	60.00%
Threshold Number Of Specified Trading Days Determining Volume Weighted Average Trading Price	10 days	10 days	10 days
Adjustment of exercise price of warrants based on market value and newly issued price (as a percent)	115.00%	115.00%	115.00%
Adjustment one of redemption price of stock based on market value and newly issued price (as a percent)	180.00%	180.00%	180.00%
Minimum threshold written notice period for redemption of public warrants	30 days	30 days	30 days
Common Stock, Trading Days On Which Fair Market Value Of Shares Is Reported | Day	10	10	10
Multiplier Used In Calculating Warrant Exercise Price	0.361	0.361	0.361
Redemption of Warrants When the Price per Class A Ordinary Share Equals or Exceeds $18.00 | Ivanhoe Capital Acquisition Corp [Member]
Class of Stock [Line Items]
Minimum threshold written notice period for redemption of public warrants	30 days	30 days	30 days
Share PriceTrigger Used To Measure Dilution Of Warrant	$ 18	$ 18	$ 18
Class Of Warrant Or Right, Redemption Price Of Warrants Or Rights	$ 0.01	$ 0.01	$ 0.01
Class Of Warrant Or Right, Redemption Of Warrants Or Rights, , Threshold Trading Days | Day	20	20	20
Class Of Warrant Or Right, Redemption Of Warrants Or Rights, , Threshold Consecutive Trading Days | Day	30	30	30
Redemption Period	30 days	30 days	30 days
Redemption of Warrants When the Price per Class A Ordinary Share Equals or Exceeds $10.00 | Ivanhoe Capital Acquisition Corp [Member]
Class of Stock [Line Items]
Minimum threshold written notice period for redemption of public warrants		30 days	30 days
Share PriceTrigger Used To Measure Dilution Of Warrant	$ 10	$ 10	$ 10
Class Of Warrant Or Right, Redemption Price Of Warrants Or Rights	$ 0.10	$ 0.10	$ 0.10
Class Of Warrant Or Right, Redemption Of Warrants Or Rights, , Threshold Trading Days | Day	20	20	20
Class Of Warrant Or Right, Redemption Of Warrants Or Rights, , Threshold Consecutive Trading Days | Day	30	30	30

Shareholders' Equity (Deficit_5

Shareholders' Equity (Deficit) - Schedule of Shares of Common Stock Available for Future Issuance on an as if Converted Basis (Details) - shares	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Common Stock Available For Future Issuance On An Converted Basis [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	40,252,490	33,218,139	33,218,139
Redeemable convertible preferred stock
Common Stock Available For Future Issuance On An Converted Basis [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	36,064,095	29,496,153	29,496,153
Common stock options outstanding
Common Stock Available For Future Issuance On An Converted Basis [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	3,697,392	3,718,568	903,700
Common stock options outstanding | Previously Reported [Member]
Common Stock Available For Future Issuance On An Converted Basis [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance		1,157,796
Shares reserved for issuance under the 2018 Plan
Common Stock Available For Future Issuance On An Converted Basis [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance		2,564,190	2,818,286
Shares reserved for issuance under the Share Incentive Plan
Common Stock Available For Future Issuance On An Converted Basis [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	491,003	3,418

Net Loss per Share - Schedule o

Net Loss per Share - Schedule of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net loss	$ (7,995)	$ (6,629)	$ (3,595)	$ (3,312)	$ (3,041)	$ (3,690)	$ (18,219)	$ (10,043)	$ (13,889)	$ (14,702)
Denominator:
Weighted-average shares of common stock outstanding	10,258,463			10,245,074			10,249,586	10,245,074	10,245,074	10,223,375
Net loss per common share – basic and diluted	$ (0.78)			$ (0.32)			$ (1.78)	$ (0.98)	$ (1.36)	$ (1.44)

Net Loss per Share - Schedule_2

Net Loss per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	39,761,487	30,558,132	30,653,949	30,399,853
Redeemable convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	36,064,095	29,496,153	29,496,153	29,496,153
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	3,697,392	1,061,979	1,157,796	903,700

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Effective income tax rate	(0.04%)	0.00%	(0.12%)	0.00%	(0.10%)	(0.70%)
Federal statutory income tax rate			21.00%		21.00%	21.00%
Unrecognized tax beneifts, changes to the total amount			$ 0
Increase in valuation allowance					$ 3,400,000	$ 4,100,000
Threshold percentage change by value in its equity ownership considered as ownership change					50.00%
Description of income tax examination					The Company’s tax years remain open for examination within the U.S. for all years, until such time as the net operating losses are initially utilized. The Company’s tax years remain open for examination by foreign authorities beginning with the tax year ended December 31, 2018.
Unrecognized tax benefits					$ 1,467,000	707,000	$ 0
Research Tax Credit Carryforward [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforwards,annual limitation on use amount					500,000
Domestic Tax Authority [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforwards					45,700,000	33,400,000
Pre Two Thousand And Eighteen [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforward,annual limitation on use amount					$ 500,000
Post Two Thousand And Seventeen [Member] | Domestic Tax Authority [Member]
Income Tax Disclosure [Line Items]
Percentage of operating loss carryforward available to offset annual taxable income					80.00%
2033 [Member] | Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforward amount					$ 900,000	600,000
2033 [Member] | MA
Income Tax Disclosure [Line Items]
Operating loss carryforwards					37,800,000
2033 [Member] | Pre Two Thousand And Eighteen [Member] | Domestic Tax Authority [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforwards					9,200,000	9,200,000
Carryforward Indefinitely [Member] | Post Two Thousand And Seventeen [Member] | Domestic Tax Authority [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforwards					36,400,000	24,100,000
2030 [Member] | MA | Research Tax Credit Carryforward [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforward amount					$ 800,000	$ 600,000

Income Taxes - Schedule of Dome

Income Taxes - Schedule of Domestic and Foreign Components of Income (Loss) Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest [Abstract]
US	$ (9,696)	$ (12,672)
Foreign	(4,186)	(1,922)
Total	$ (13,882)	$ (14,594)

Income Taxes - Summary of the I

Income Taxes - Summary of the Income Tax Provision (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal					$ 0	$ 0
State					1	1
Foreign					6	107
Total					7	108
Deferred:
Federal					0	0
State					0	0
Foreign					0	0
Total	$ 3	$ 0	$ 22	$ 0	$ 7	$ 108

Income Taxes - Schedule of Reco

Income Taxes - Schedule of Reconciliation of the Federal Statutory Tax Rate to the Effective Income Tax Rate (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal statutory income tax rate			21.00%		21.00%	21.00%
Foreign Tax					(0.10%)	(0.70%)
Foreign income taxed at non-US rates					(0.20%)	0.00%
Other permanent items					(0.90%)	(1.10%)
Research and development tax credits					2.20%	3.00%
Unrecognized tax benefits					(0.70%)	(0.70%)
Increase in Valuation Allowance					(21.70%)	(21.80%)
Others					0.30%	(0.40%)
Effective income tax rate	(0.04%)	0.00%	(0.12%)	0.00%	(0.10%)	(0.70%)

Income Taxes - Schedule of Comp

Income Taxes - Schedule of Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Net operating losses	$ 12,033	$ 9,142
Research and development tax credits	1,079	709
Accruals and Reserves	624	612
Stock-based compensation	93	65
Other	3	0
Gross deferred tax assets	13,832	10,528
Valuation Allowance	(13,711)	(10,276)
Total deferred tax assets	121	252
Deferred tax liabilities:
Fixed Assets	(121)	(252)
Total deferred tax liabilities	(121)	(252)
Total net deferred tax assets	$ 0	$ 0

Income Taxes - Schedule of Re_2

Income Taxes - Schedule of Reconciliation of Beginning and Ending Balances of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning of the year	$ 707	$ 0
Increase – current year positions	760	600
Increase – prior year positions	0	107
End of the year	$ 1,467	$ 707

Private Placement (Details)

Private Placement (Details) - Ivanhoe Capital Acquisition Corp [Member] - USD ($) $ / shares in Units, $ in Millions	6 Months Ended		9 Months Ended
	Jan. 11, 2021	Dec. 31, 2020	Sep. 30, 2021
Subsidiary, Sale of Stock [Line Items]
Exercise price of warrant	$ 11.50	$ 11.50	$ 11.50
Private Placement [Member]
Subsidiary, Sale of Stock [Line Items]
Number of warrants to purchase shares issued	5,013,333	5,013,333	5,013,333
Price of warrants	$ 1.50	$ 1.50	$ 1.50
Proceeds from sale of warrants	$ 7.5	$ 7.5	$ 7.5
Number of shares per warrant	1	1	1
Exercise price of warrant	$ 11.50	$ 11.50	$ 11.50

Related Party Transactions - Fo

Related Party Transactions - Founder Shares (Details) - USD ($)	Jan. 11, 2021	Jan. 06, 2021	Dec. 16, 2020	Jul. 22, 2020	May 31, 2021	Sep. 30, 2020	Jan. 11, 2021	Dec. 31, 2020		Sep. 30, 2021
Related Party Transaction [Line Items]
Number of shares issued					1,698,088
Aggregate purchase price					$ 50,000,000
Number of shares surrender			2,875,000
Share dividend		1,150,000
Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
Aggregate purchase price						$ 25,000	$ 25,000	$ 25,000	[1],[2]	$ 1,100,000
Number of shares surrender	900,000
Notes Payable, Related Parties	$ 0						0	$ 0
Ivanhoe Capital Acquisition Corp [Member] | Working capital loans warrant
Related Party Transaction [Line Items]
Loan Amount Outstanding	$ 0						$ 0
Common Class B [Member] | Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
Number of shares surrender			2,875,000
Share dividend		1,150,000
Aggregate number of shares owned		6,900,000
Shares subject to forfeiture		900,000						900,000
Sponsor | Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
Aggregate purchase price				$ 25,000				$ 25,000
Founder Shares | Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
Percentage of assign or sale of shares or warrants, after the completion of the initial business combination				20.00%
Stock price trigger to transfer, assign or sell any shares or warrants of the company, after the completion of the initial business combination (in dollars per share)				$ 12
Founder Shares | Common Class B [Member] | Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
Percentage of assign or sale of shares or warrants, after the completion of the initial business combination				20.00%
Founder Shares | Maximum [Member] | Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
Stock price trigger to transfer, assign or sell any shares or warrants of the company, after the completion of the initial business combination (in dollars per share)				$ 18
Founder Shares | Minimum [Member] | Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
Stock price trigger to transfer, assign or sell any shares or warrants of the company, after the completion of the initial business combination (in dollars per share)				$ 18
Founder Shares | Sponsor | Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
Percentage of assign or sale of shares or warrants, after the completion of the initial business combination				20.00%
Founder Shares | Sponsor | Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
Percentage of assign or sale of shares or warrants, after the completion of the initial business combination				20.00%
Stock price trigger to transfer, assign or sell any shares or warrants of the company, after the completion of the initial business combination (in dollars per share)				$ 14
Threshold trading days for transfer, assign or sale of shares or warrants, after the completion of the initial business combination				20 days
Threshold consecutive trading days for transfer, assign or sale of shares or warrants, after the completion of the initial business combination				30 days
Founder Shares | Sponsor | Common Class B [Member] | Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
Number of shares issued				8,625,000
Aggregate purchase price				$ 25,000
Number of shares surrender			2,875,000
Share dividend		1,150,000
Aggregate number of shares owned		6,900,000
Shares subject to forfeiture	0	900,000					0
Common stock, shares subject to forfeiture, as a percent of issued and outstanding shares (as a percent)		20.00%
Threshold consecutive trading days for transfer, assign or sale of shares or warrants, after the completion of the initial business combination				30 days
Founder Shares | Sponsor | Minimum [Member] | Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
Stock price trigger to transfer, assign or sell any shares or warrants of the company, after the completion of the initial business combination (in dollars per share)				$ 16
Related Party Loans [Member] | Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
Maximum Borrowing Capacity of Related Party Promissory Note				$ 600,000
Notes Payable, Related Parties				500,000				0
maximum Loans Convertible Into Warrants				$ 1,500,000
Related Party Loans [Member] | Ivanhoe Capital Acquisition Corp [Member] | Working capital loans warrant
Related Party Transaction [Line Items]
Class of Warrant or Right, Price of Warrants or Rights				$ 1.50
Administrative Support Agreement | Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party Per Month	$ 10,000							$ 10,000		$ 10,000
[1]	Shares and the associated amounts have been retroactively restated to reflect: (i) the surrender of 2,875,000 Class B ordinary shares to the Company for cancellation for no consideration on December 16, 2020; and (ii) the share capitalization of 1,150,000 shares on January 6, 2021, resulting in an aggregate of 6,900,000 Class B ordinary shares outstanding (see Note 6).
[2]	This number excludes an aggregate of up to 900,000 Class B ordinary shares subject to forfeiture if the over-allotment option was not exercised in full or in part by the underwriter. On January 11, 2021, the underwriter exercised its over-allotment option, in full; thus these shares are no longer subject to forfeiture (see Note 6).

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Details) - USD ($)	Apr. 09, 2021	Jan. 11, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Jul. 22, 2020
Related Party Transaction [Line Items]
stock price per share			$ 0.000001		$ 0.000001	$ 0.000001	$ 0.000001	$ 0.000001
Related party transaction amounts of transaction							$ 0	$ 0
Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
Outstanding balance of related party note		$ 0			$ 0		$ 0
Repayment of promissory note - related party				$ 0
Maximum borrowing capacity of working capital loan			$ 945,000			$ 945,000
Fair Value of convertible note - related party			1,064,140			1,064,140
Due to related party			$ 10,532			$ 10,532
Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
stock price per share		$ 0.0001	$ 0.0001		$ 0.0001	$ 0.0001	$ 0.0001
Ordinary share price, per share	$ 11.50
Common Class A [Member] | Convertible Debt [Member] | Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
stock price per share	0.0001
Conversion price	$ 1.50
Working capital loans warrant | Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
Maximum borrowing capacity of working capital loan			$ 1,500,000			$ 1,500,000
Chief Executive Officer [Member] | Convertible Debt [Member] | Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
Maximum borrowing capacity of related party promissory note	$ 1,500,000
Administrative Support Agreement
Related Party Transaction [Line Items]
Due to related party			10,000			10,000
Administrative Support Agreement | Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
Expenses per month		$ 10,000			$ 10,000	10,000
Expenses incurred and paid			$ 30,000			90,000
Administrative Support Agreement | Sponsor | Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
Expenses incurred and paid						$ 1,000
Related Party Loans [Member] | Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
Maximum borrowing capacity of related party promissory note									$ 600,000
Outstanding balance of related party note					$ 0		$ 0		500,000
Loan conversion agreement warrant									$ 1,500,000
Related Party Loans [Member] | Working capital loans warrant | Ivanhoe Capital Acquisition Corp [Member]
Related Party Transaction [Line Items]
Price of warrant									$ 1.50

Related Party Transactions - Su

Related Party Transactions - Summary of related party role in entity and voting interest on fully diluted basis (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Dr. Qichao Hu [Member]
Related Party Transaction [Line Items]
Role	Chief Executive Officer, Founder and Board representation	Chief Executive Officer, Founder and Board representation	Chief Executive Officer, Founder and Board representation
Voting Interest	13.40%	15.47%	15.47%
Long Siang Pte Ltd. [Member]
Related Party Transaction [Line Items]
Role	Board representation	Board representation	Board representation
Voting Interest	8.30%	9.58%	9.58%
Vertex Legacy Continuation Fund Pte Ltd [Member]
Related Party Transaction [Line Items]
Role	Board representation	Board representation	Board representation
Voting Interest	9.70%	10.79%	10.79%
General Motors Ventures LLC [Member]
Related Party Transaction [Line Items]
Role	Board representation	Board representation	Board representation
Voting Interest	7.00%	7.25%	7.25%
Tianqi Lithium HK Co Ltd [Member]
Related Party Transaction [Line Items]
Role	Board representation	Board representation	Board representation
Voting Interest	9.30%	10.76%	10.76%
Anderson Investments Pte Ltd [Member]
Related Party Transaction [Line Items]
Role	Board representation	Board representation	Board representation
Voting Interest	8.70%	10.04%	10.04%
SK Holdings [Member]
Related Party Transaction [Line Items]
Role	Board representation	Board representation	Board representation
Voting Interest	12.90%	11.89%	11.89%

Derivative Warrant Liabilities

Derivative Warrant Liabilities - Additional Information (Details)	6 Months Ended		9 Months Ended
	Jan. 11, 2021Day$ / shares	Dec. 31, 2020Day$ / sharesshares	Sep. 30, 2021Day$ / sharesshares
Class of Warrant or Right [Line Items]
Minimum threshold written notice period for redemption of public warrants	30 days
Ivanhoe Capital Acquisition Corp [Member]
Class of Warrant or Right [Line Items]
Public Warrants exercisable term after the completion of a business combination	30 days	30 days	30 days
Public Warrants exercisable term from the closing of the initial public offering	12 months	12 months	12 months
Maximum period after business combination in which to file registration statement		15 days	15 days
Period of time within which registration statement is expected to become effective	60 days	60 days	60 days
Exercise price of warrants	$ 11.50	$ 11.50	$ 11.50
Public Warrants expiration term	5 years	5 years	5 years
Threshold issue price per share	$ 9.20	$ 9.20	$ 9.20
Percentage of gross proceeds on total equity proceeds	60.00%	60.00%	60.00%
Threshold trading days determining volume weighted average price	10 days	10 days	10 days
Adjustment of exercise price of warrants based on market value and newly issued price (as a percent)	115.00%	115.00%	115.00%
Adjustment one of redemption price of stock based on market value and newly issued price (as a percent)	180.00%	180.00%	180.00%
Minimum threshold written notice period for redemption of public warrants	30 days	30 days	30 days
Number of trading days on which fair market value of shares is reported | Day	10	10	10
Multiplier used in calculating warrant exercise price	0.361	0.361	0.361
Ivanhoe Capital Acquisition Corp [Member] | Maximum [Member]
Class of Warrant or Right [Line Items]
Period For Filling Registration Statement After Business Combination	15 days
Redemption of Warrants When the Price per Class A Ordinary Share Equals or Exceeds $18.00 | Ivanhoe Capital Acquisition Corp [Member]
Class of Warrant or Right [Line Items]
Share price trigger used to measure dilution of warrant	$ 18	$ 18	$ 18
Redemption price per public warrant (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Minimum threshold written notice period for redemption of public warrants	30 days	30 days	30 days
Threshold trading days for redemption of public warrants | Day	20	20	20
Threshold consecutive trading days for redemption of public warrants | Day	30	30	30
Redemption period	30 days	30 days	30 days
Redemption of Warrants When the Price per Class A Ordinary Share Equals or Exceeds $10.00 | Ivanhoe Capital Acquisition Corp [Member]
Class of Warrant or Right [Line Items]
Share price trigger used to measure dilution of warrant	$ 10	$ 10	$ 10
Redemption price per public warrant (in dollars per share)	$ 0.10	$ 0.10	$ 0.10
Minimum threshold written notice period for redemption of public warrants		30 days	30 days
Threshold trading days for redemption of public warrants | Day	20	20	20
Threshold consecutive trading days for redemption of public warrants | Day	30	30	30
Warrant [Member] | Ivanhoe Capital Acquisition Corp [Member]
Class of Warrant or Right [Line Items]
Warrants outstanding | shares		0
Private Placement Warrants | Ivanhoe Capital Acquisition Corp [Member]
Class of Warrant or Right [Line Items]
Warrants outstanding | shares			5,013,333
Public Warrants | Ivanhoe Capital Acquisition Corp [Member]
Class of Warrant or Right [Line Items]
Warrants outstanding | shares			9,200,000

Class A Ordinary Shares Subje_3

Class A Ordinary Shares Subject to Possible Redemption (Details)	6 Months Ended	9 Months Ended
	Jan. 11, 2021USD ($)vote$ / sharesshares	Sep. 30, 2021USD ($)vote$ / sharesshares	Dec. 31, 2020vote$ / sharesshares	Dec. 31, 2019$ / sharesshares
Temporary Equity [Line Items]
Common Stock, Shares Authorized | shares		45,000,000	45,000,000	39,000,000
Common Stock, Par or Stated Value Per Share | $ / shares		$ 0.000001	$ 0.000001	$ 0.000001
Temporary equity, shares outstanding | shares		36,064,095	29,496,153	29,496,153
Common Class A [Member] | Ivanhoe Capital Acquisition Corp [Member]
Temporary Equity [Line Items]
Common Stock, Shares Authorized | shares	200,000,000	200,000,000	200,000,000
Common Stock, Par or Stated Value Per Share | $ / shares	$ 0.0001	$ 0.0001	$ 0.0001
Common Stock, Number Of Votes Per Share | vote	1	1	1
Temporary equity, shares outstanding | shares	27,600,000
Class A Common Stock Subject to Redemption | Ivanhoe Capital Acquisition Corp [Member]
Temporary Equity [Line Items]
Temporary equity, shares outstanding | shares	27,600,000	27,600,000	0
Gross proceeds from Initial Public Offering | $	$ 276,000,000	$ 276,000,000
Fair value of Public Warrants at issuance | $	(14,628,000)	(14,628,000)
Offering costs allocated to Class A ordinary shares subject to possible redemption | $	(14,971,596)	(14,971,596)
Accretion on Class A ordinary shares subject to possible redemption amount | $	29,599,596	29,599,596
Class A ordinary shares subject to possible redemption | $	$ 276,000,000	$ 276,000,000

Note payable - Additional Infor

Note payable - Additional Information (Details) - USD ($)	1 Months Ended	9 Months Ended		12 Months Ended
	Apr. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Proceeds from notes payable		$ 0	$ 840,000	$ 840,000	$ 0
PPP Note [Member]
Proceeds from notes payable	$ 800
Debt instrument, Interest rate, Stated percentage	1.00%
Interest expense, Debt				$ 0

Employee Benefit Plan - Additio

Employee Benefit Plan - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan employer contributions amount	$ 0	$ 0

Segment and Geographic Inform_3

Segment and Geographic Information - Schedule Of Long lived Assets by geographical areas (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Property and equipment, net:
Total property and equipment, net	$ 5,656	$ 6,044	$ 7,185
Intangible assets, net:
Total intangible assets, net	$ 1,632	1,728	1,856
Total long-lived assets		7,772	9,041
UNITED STATES
Property and equipment, net:
Total property and equipment, net		3,700	4,618
CHINA
Property and equipment, net:
Total property and equipment, net		2,344	2,567
SINGAPORE
Intangible assets, net:
Total intangible assets, net		$ 1,728	$ 1,856

Segment and Geographic Inform_4

Segment and Geographic Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020Segment
Segment Reporting [Abstract]
Number of reportable segments	1

Partnerships - Additional Infor

Partnerships - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended	9 Months Ended
	Feb. 28, 2021	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Accounts receivable, related parties, current		$ 1,138,000	$ 1,138,000	$ 0
Partnership Interest [Member] | General Motors [Member] | Joint Development Agreement [Member]
Research and development arrangement, Term of agreement	3 years
Partnership Interest [Member] | General Motors [Member] | Joint Development Agreement [Member] | Research and Development Arrangement [Member]
Accounts receivable, related parties, current		800,000	800,000
Partnership Interest [Member] | Research and Development Expense [Member] | General Motors [Member] | Joint Development Agreement [Member] | Research and Development Arrangement [Member]
Related party transaction, Other revenues from transactions with related party		800,000	5,900,000
Partnership Interest [Member] | Hyundai [Member]
Research and development arrangement, Outstanding receivable		0	0	$ 0
Partnership Interest [Member] | Hyundai [Member] | Research and Development Expense [Member]
Research and development arrangement, Contract to perform for others, Compensation earned		$ 300,000	$ 1,100,000

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - USD ($)

Oct. 22, 2021

Jul. 12, 2021

May 31, 2021

Apr. 30, 2021

Mar. 31, 2021

Apr. 30, 2020

Sep. 30, 2021

Sep. 30, 2020

Sep. 30, 2020

Jan. 11, 2021

Dec. 31, 2020

Sep. 30, 2021

Sep. 30, 2020

Dec. 31, 2020

Dec. 31, 2019

Nov. 01, 2021

Feb. 28, 2021

Jan. 15, 2021

Jul. 22, 2020

Subsequent Event [Line Items]

Shares issues

1,698,088

Aggregate purchase price

$ 50,000,000

Operating leases, rent expense

$ 500,000

$ 300,000

$ 1,200,000

$ 900,000

$ 1,300,000

$ 1,100,000

Shares issued, price per share

$ 0.000001

Ivanhoe Capital Acquisition Corp [Member]

Subsequent Event [Line Items]

Outstanding balance of related party note

$ 0

$ 0

$ 0

Sale of stock, price per share

$ 10

$ 10

Aggregate purchase price

$ 25,000

$ 25,000

$ 25,000

[1],[2]

$ 1,100,000

Shares issued, price per share

$ 10

$ 10

$ 10

$ 10

$ 10

$ 10

Series D Redeemable Convertible Preferred Stock

Subsequent Event [Line Items]

Shares issues

4,869,854

Aggregate purchase price

$ 138,500,000

Shares issued, price per share

$ 0.000001

Series D Plus Redeemable Convertible Preferred Stock

Subsequent Event [Line Items]

Shares issues

1,698,088

Aggregate purchase price

$ 50,000,000

Shares issued, price per share

$ 0.000001

Existing Shareholders

Subsequent Event [Line Items]

Operating leases, rent expense

$ 67,000,000

PIPE Investors

Subsequent Event [Line Items]

Shares issues

27,500,000

Sale of stock, price per share

$ 10

Aggregate amount of commitments under subscription agreements

$ 275,000

PIPE Investors | Ivanhoe Capital Acquisition Corp [Member]

Subsequent Event [Line Items]

Sale of stock, price per share

$ 10

$ 10

Aggregate amount of commitments under subscription agreements

$ 200,000

PIPE Investors | Business Combination Agreement | Ivanhoe Capital Acquisition Corp [Member]

Subsequent Event [Line Items]

Aggregate purchase price

$ 75,000,000

Ses Holdings Pte. Ltd

Subsequent Event [Line Items]

Earn-out shares

30,000,000

Share price

$ 10

Closing stock trigger price for issuance of earn-out shares.

$ 18

Minimum period of closing stock trigger price for issuance of earn-out shares

1 year

Maximum period of closing stock trigger price for issuance of earn-out shares

5 years

Business acquisition, date of acquisition agreement

Jul. 12, 2021

Ses Holdings Pte. Ltd | Ivanhoe Capital Acquisition Corp [Member]

Subsequent Event [Line Items]

Sale of stock, price per share

$ 10

Related Party Loans | Ivanhoe Capital Acquisition Corp [Member]

Subsequent Event [Line Items]

Outstanding balance of related party note

$ 0

$ 0

$ 500,000

Subsequent Event | Series D Redeemable Convertible Preferred Stock

Subsequent Event [Line Items]

Shares issues

4,869,854

Aggregate purchase price

$ 138,500,000

Shares issued, price per share

$ 0.000001

Subsequent Event | Series D Redeemable Convertible Preferred Stock | General Motors | Joint Development Agreement

Subsequent Event [Line Items]

Convertible preferred stock, nonredeemable or redeemable, issuer option, value

$ 50,000,000

$ 50,000,000

Subsequent Event | Series D Plus Redeemable Convertible Preferred Stock

Subsequent Event [Line Items]

Shares issues

1,698,088

Aggregate purchase price

$ 50,000,000

Shares issued, price per share

$ 0.000001

Subsequent Event | Series D Plus Redeemable Convertible Preferred Stock | Hyundai | Joint Development Agreement

Subsequent Event [Line Items]

Convertible preferred stock, nonredeemable or redeemable, issuer option, value

$ 50,000,000

Subsequent Event | Minimum

Subsequent Event [Line Items]

Operating leases, rent expense

$ 800,000

Subsequent Event | Maximum

Subsequent Event [Line Items]

Operating leases, rent expense

$ 1,500,000

Subsequent Event | Existing Shareholders

Subsequent Event [Line Items]

Aggregate purchase price

$ 67,000,000

Subsequent Event | PIPE Investors

Subsequent Event [Line Items]

Shares issues

7,500,000

27,450,000

Sale of stock, price per share

$ 10

$ 10

Aggregate purchase price

$ 75,000,000

$ 274,500,000

Subsequent Event | PIPE Investors | Ivanhoe Capital Acquisition Corp [Member]

Subsequent Event [Line Items]

Shares issues

20,000,000

Sale of stock, price per share

$ 10

Aggregate purchase price

$ 200,000,000

Aggregate amount of commitments under subscription agreements

$ 275,000

Subsequent Event | PIPE Investors | Business Combination Agreement

Subsequent Event [Line Items]

Shares issues

27,500,000

Sale of stock, price per share

$ 10

Aggregate purchase price

$ 275,000,000

Subsequent Event | Ses Holdings Pte. Ltd

Subsequent Event [Line Items]

Earn-out shares

29,999,947

Share price

$ 10

Closing stock trigger price for issuance of earn-out shares.

$ 18

Business acquisition, date of acquisition agreement

Jul. 12, 2021

Subsequent Event | Ses Holdings Pte. Ltd | Ivanhoe Capital Acquisition Corp [Member]

Subsequent Event [Line Items]

Earn-out shares

30,000,000

Share price

$ 10

Closing stock trigger price for issuance of earn-out shares.

$ 18

Minimum period of closing stock trigger price for issuance of earn-out shares

1 year

Maximum period of closing stock trigger price for issuance of earn-out shares

5 years

Subsequent Event | Related Party Loans | Ivanhoe Capital Acquisition Corp [Member]

Subsequent Event [Line Items]

Outstanding balance of related party note

$ 500,000

[1]

Shares and the associated amounts have been retroactively restated to reflect: (i) the surrender of 2,875,000 Class B ordinary shares to the Company for cancellation for no consideration on December 16, 2020; and (ii) the share capitalization of 1,150,000 shares on January 6, 2021, resulting in an aggregate of 6,900,000 Class B ordinary shares outstanding (see Note 6).

[2]

This number excludes an aggregate of up to 900,000 Class B ordinary shares subject to forfeiture if the over-allotment option was not exercised in full or in part by the underwriter. On January 11, 2021, the underwriter exercised its over-allotment option, in full; thus these shares are no longer subject to forfeiture (see Note 6).