SiTime (SITM) 10-Q 4 Nov 21 2021 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Oct. 29, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Entity Registrant Name	SiTime Corporation
Entity Central Index Key	0001451809
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock Shares Outstanding		19,254,018
Entity Shell Company	false
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Title of 12(b) Security	Common Stock, $0.0001 par value per share
Trading Symbol	SITM
Security Exchange Name	NASDAQ
Entity File Number	001-39135
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	02-0713868
Entity Address, Address Line One	5451 Patrick Henry Drive
Entity Address, City or Town	Santa Clara
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95054
City Area Code	408
Local Phone Number	328-4400
Document Quarterly Report	true
Document Transition Report	false

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 267,042	$ 73,525
Accounts receivable, net	32,466	23,920
Related party accounts receivable	5	736
Inventories	19,635	12,350
Prepaid expenses and other current assets	3,906	2,649
Total current assets	323,054	113,180
Property and equipment, net	31,346	11,708
Intangible assets, net	4,540	2,069
Right-of-use assets, net	8,341	8,892
Other assets	162	162
Total assets	367,443	136,011
Current liabilities:
Accounts payable	12,972	6,182
Accrued expenses and other current liabilities	20,464	12,963
Total current liabilities	33,436	19,145
Lease liabilities	6,356	6,986
Other non-current liabilities	1,654
Total liabilities	41,446	26,131
Commitments and contingencies (Note 9)
Stockholders’ equity:
Common stock, $0.0001 par value - 200,000 shares authorized; 19,254 and 17,150 shares issued and outstanding at September 30, 2021 and December 31, 2020	2	2
Additional paid-in capital	376,973	173,274
Accumulated deficit	(50,978)	(63,396)
Total stockholders’ equity	325,997	109,880
Total liabilities and stockholders’ equity	$ 367,443	$ 136,011

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares, issued	19,254,000	17,150,000
Common stock, shares, outstanding	19,254,000	17,150,000

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue	$ 63,029	$ 32,667	$ 143,067	$ 75,882
Cost of revenue	21,334	15,765	55,727	39,021
Gross profit	41,695	16,902	87,340	36,861
Operating expenses:
Research and development	13,005	8,484	36,252	22,906
Selling, general and administrative	14,616	8,978	38,425	24,642
Total operating expenses	27,621	17,462	74,677	47,548
Income (loss) from operations	14,074	(560)	12,663	(10,687)
Interest expense		(110)		(726)
Other income (expense), net	(110)	3	(178)	51
Income (loss) before income taxes	13,964	(667)	12,485	(11,362)
Income tax expense	(4)		(67)	(1)
Net income (loss)	13,960	(667)	12,418	(11,363)
Net income (loss) attributable to common stockholders and comprehensive loss	$ 13,960	$ (667)	$ 12,418	$ (11,363)
Net income (loss) per share attributable to common stockholders, basic	$ 0.73	$ (0.04)	$ 0.67	$ (0.72)
Net income (loss) per share attributable to common stockholders, diluted	$ 0.66	$ (0.04)	$ 0.60	$ (0.72)
Weighted-average shares used to compute basic net income (loss) per share	19,149	16,818	18,658	15,737
Weighted-average shares used to compute diluted net income (loss) per share	21,252	16,818	20,770	15,737

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Follow-on Public Offering	Common Stock	Common StockFollow-on Public Offering	Additional Paid-in Capital	Additional Paid-in CapitalFollow-on Public Offering	Accumulated Deficit
Beginning Balance at Dec. 31, 2019	$ 62,140		$ 2		$ 116,162		$ (54,024)
Beginning Balance, Shares at Dec. 31, 2019			14,968
Stock-based compensation expense	9,749				9,749
Net income (loss)	(11,363)						(11,363)
Issuance of common stock upon follow-on public offering net of underwriting discounts and commissions and other offering costs		$ 45,789				$ 45,789
Issuance of common stock upon follow-on public offering net of underwriting discounts and commissions and other offerings costs, Shares				1,525
Issuance of shares upon vesting of restricted stock units, net of tax withholdings	(3,492)				(3,492)
Issuance of shares upon vesting of restricted stock units, net of tax withholdings, Shares			447
Ending Balance at Sep. 30, 2020	102,823		$ 2		168,208		(65,387)
Ending Balance, Shares at Sep. 30, 2020			16,940
Beginning Balance at Jun. 30, 2020	99,569		$ 2		164,287		(64,720)
Beginning Balance, Shares at Jun. 30, 2020			16,716
Stock-based compensation expense	3,919				3,919
Net income (loss)	(667)						(667)
Issuance of shares upon vesting of restricted stock units, net of tax withholdings	2				2
Issuance of shares upon vesting of restricted stock units, net of tax withholdings, Shares			224
Ending Balance at Sep. 30, 2020	102,823		$ 2		168,208		(65,387)
Ending Balance, Shares at Sep. 30, 2020			16,940
Beginning Balance at Dec. 31, 2020	$ 109,880		$ 2		173,274		(63,396)
Beginning Balance, Shares at Dec. 31, 2020	17,150		17,150
Stock-based compensation expense	$ 22,111				22,111
Net income (loss)	12,418						12,418
Issuance of common stock upon follow-on public offering net of underwriting discounts and commissions and other offering costs		$ 181,588				$ 181,588
Issuance of common stock upon follow-on public offering net of underwriting discounts and commissions and other offerings costs, Shares				1,500
Issuance of shares upon vesting of restricted stock units, net of tax withholdings, Shares			604
Ending Balance at Sep. 30, 2021	$ 325,997		$ 2		376,973		(50,978)
Ending Balance, Shares at Sep. 30, 2021	19,254		19,254
Beginning Balance at Jun. 30, 2021	$ 303,926		$ 2		368,862		(64,938)
Beginning Balance, Shares at Jun. 30, 2021			19,061
Stock-based compensation expense	8,111				8,111
Net income (loss)	13,960						13,960
Issuance of shares upon vesting of restricted stock units, net of tax withholdings, Shares			193
Ending Balance at Sep. 30, 2021	$ 325,997		$ 2		$ 376,973		$ (50,978)
Ending Balance, Shares at Sep. 30, 2021	19,254		19,254

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income (loss)	$ 12,418	$ (11,363)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization expense	5,554	4,966
Stock-based compensation expense	21,537	10,129
Impairment of internal-use software		959
Changes in assets and liabilities:
Accounts receivable, net	(8,546)	435
Related party accounts receivable	731	335
Inventories	(7,284)	(3,481)
Prepaid expenses and other assets	(1,257)	2,625
Accounts payable	3,204	3,820
Accrued expenses and other liabilities	9,012	2,108
Lease liabilities		(691)
Other assets and liabilities	(956)
Net cash provided by operating activities	34,413	9,842
Cash flows from investing activities
Purchase of property and equipment	(20,067)	(3,912)
Cash paid for intangibles	(2,417)	(1,437)
Net cash used in investing activities	(22,484)	(5,349)
Cash flows from financing activities
Proceeds from public offering, net of underwriting discounts and commissions	181,928	46,116
Payments for offering costs	(340)	(327)
Tax withholding paid on behalf of employees for net share settlement		(3,492)
Proceeds from loans from financial institutions		35,000
Principal payments on loans to financial institutions		(76,000)
Net cash provided by financing activities	181,588	1,297
Net increase in cash and cash equivalents	193,517	5,790
Cash and cash equivalents
Beginning of period	73,525	63,418
End of period	267,042	69,208
Supplemental disclosure of cash flow information
Interest paid during the period		799
Income taxes paid	1	1
Supplemental disclosure of noncash flow information
Unpaid property and equipment	3,928	420
Unpaid intangibles, net	1,615
Right-of-use assets acquired under operating leases	$ 529	$ 382

The Company and Basis of Presen

The Company and Basis of Presentation	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
The Company and Basis of Presentation	Note 1. The Company and Basis of Presentation SiTime Corporation (the “Company”) was incorporated in the State of Delaware in December 2003. The Company is a provider of silicon timing systems. The Company primarily supplies oscillator products that comprise a MEMS resonator and clock IC that is integrated into a package, as well as standalone resonators. The Company has also started to sample clock ICs. The Company’s products are designed to address a wide range of applications across a broad array of end markets. The Company operates a fabless business model and leverages its global network of distributors and resellers to address the broad set of end markets that it serves. In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all adjustments of a normal, recurring nature, which are necessary to state fairly the financial information included therein. These financial statements should be read in conjunction with the audited consolidated financial statements and related notes thereto included in SiTime Corporation's Annual Report on Form 10-K for the fiscal year ended December 31, 2020. The year-end condensed balance sheet data was derived from audited financial statements, but does not include all disclosures required by GAAP. The Company was a wholly-owned subsidiary of MegaChips Corporation (“MegaChips”), a fabless semiconductor company based in Japan and traded on the Tokyo Stock Exchange, until the Company completed its initial public offering in November 2019. On June 16, 2020, the Company completed a follow-on public offering, in which it issued and sold 1,525,000 shares of its common stock and MegaChips sold 2,500,000 of the Company’s common stock held by them , resulting in net proceeds to the Company of $ 45.8 million after deducting underwriting discounts and commissions of $ 2.7 million and deferred offering costs of $ 0.3 million. On February 22, 2021, the Company completed an additional follow-on public offering, in which it issued and sold 1,500,000 shares of its common stock and MegaChips sold 1,500,000 of the Company’s common stock held by them , resulting in net proceeds to the Company of $ 181.6 million after deducting underwriting discounts and commissions of $ 8.6 million and deferred offering costs of $ 0.3 million. MegaChips remains the largest stockholder of the Company and held approximately 31.2 % of the Company’s outstanding common stock as of September 30, 2021. Outbreak of Coronavirus Disease 2019 (“the COVID-19 pandemic”) On March 11, 2020, the World Health Organization characterized the outbreak of the coronavirus disease known as COVID-19 as a global pandemic and recommended containment and mitigation measures. On March 13, 2020, the United States declared a national emergency concerning the outbreak, and several states and municipalities have declared public health emergencies. To combat the spread of the COVID-19 pandemic, the United States and other foreign countries in which the Company operates have imposed measures such as quarantines and “shelter-in-place” orders that are restricting business operations and travel and requiring individuals to work from home (“WFH”), which has impacted all aspects of the Company’s business as well as those of the third-parties the Company relies upon for manufacturing, assembly, testing, shipping and other operations. The global health crisis caused by the COVID-19 pandemic has negatively impacted business activity across the globe and has impacted the Company's employees and operations. The inputs into the Company’s judgments and estimates consider the economic implications of the COVID-19 pandemic, as the Company knows them, on the Company’s critical and significant accounting estimates. The extent to which the COVID-19 pandemic may impact the Company’s business will depend on future developments, which are highly uncertain, including the future effects of the COVID-19 pandemic on its employees, customers, suppliers, results of operations, financial condition, or liquidity for the remainder of fiscal year 2021 and beyond . To date, we have experienced minimal impact from any supplier disruption resulting from COVID-19. Principles of Consolidation The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. Significant Accounting Policies The Company’s significant accounting policies are disclosed in the Company’s audited consolidated financial statements and related notes thereto included in the Annual Report on Form 10-K for the year ended December 31, 2020. There had been no changes to these accounting policies except for the recently adopted accounting guidance and non-recurring engineering services as discussed below. Non-recurring engineering services The Company has certain contracts to provide non-recurring engineering (NRE) services for research and development arrangements, including cost sharing arrangements, which do not meet the requirement to be accounted for under ASC 606, Revenue from Contracts with Customers. The Company recognizes the advanced payments received from the counterparty as liabilities and recognizes them as an offset to research and development expense as progress toward completion occurs using an input method based on the ratio of costs incurred to date to total estimated costs of the project. Significant judgment is required to estimate the remaining effort to complete the project. These estimates are reassessed throughout the term of the arrangement. A liability of $ 3.9 million and $ 0.7 million was recorded as accrued expenses and other current liabilities, and other non-current liabilities, respectively, in the condensed consolidated balance sheet as of September 30, 2021. For the three and nine months ended September 30, 2021, the Company recorded $ 0.9 million and $ 1.0 million, respectively, as a reduction of research and development expenses in the condensed consolidated statement of operations. There were no reduction of research and development expenses recorded during the three and nine months ended September 30, 2020. Recently Adopted Accounting Guidance In December 2019, the Financial Accounting Standard Board (“FASB”) issued Accounting Standard Update (“ASU”) 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which eliminates certain exceptions related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. It also clarifies and simplifies other aspects of the accounting for income taxes. The adoption of this standard on January 1, 2021 did not have any material impact on the Company’s consolidated financial position, results of operations or cash flows. There are no new accounting pronouncements that are pending to be adopted by the Company.

Net Income (Loss) Per Share

Net Income (Loss) Per Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	Note 2. Net Income (Loss) Per Share The following table summarizes the computation of basic and diluted net loss (income) per share attributable to common stockholders of the Company: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (in thousands, except per share data) Net income (loss) attributable to common stockholders $ 13,960 $ ( 667 ) $ 12,418 $ ( 11,363 ) Weighted-average shares outstanding Weighted average shares used to compute basic net income (loss) per share 19,149 16,818 18,658 15,737 Dilutive effect of employee equity incentive plans 2,103 — 2,112 — Weighted average shares used to compute diluted net income (loss) per share 21,252 16,818 20,770 15,737 Net income (loss) attributable to common stockholders per share, basic $ 0.73 $ ( 0.04 ) $ 0.67 $ ( 0.72 ) Net income (loss) attributable to common stockholders per share, diluted $ 0.66 $ ( 0.04 ) $ 0.60 $ ( 0.72 ) Potential dilutive securities include dilutive common shares from share-based awards attributable to the assumed exercise of restricted stock units using the treasury stock method. Under the treasury stock method, potential common shares outstanding are not included in the computation of diluted net income per share if their effect is anti-dilutive. Anti-dilutive potential shares from share-based awards are excluded from the calculation of diluted earnings per share if either their exercise price exceeded the average market price during the period or the share-based awards were determined to be anti-dilutive based on applying the treasury stock method. During the three and nine months ended September 30, 2021, the Company had no potential shares and 5,350 potential shares from share-based awards that are anti-dilutive, respectively. During the three and nine months ended September 30, 2020, the Company had 2,835,076 and 2,902,824 potential shares from share-based awards that are anti-dilutive, respectively. Anti-dilutive potential shares from share-based awards are excluded from the calculation of diluted loss per share for the three and nine months ended September 30, 2020 due to the net losses reported in these periods.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 3. Fair Value Measurements The carrying amounts of the Company’s financial instruments, which include cash equivalents, accounts receivable, accounts payable, accrued liabilities, and other current liabilities, approximate their fair values due to their short maturities. On September 30, 2021 and December 31, 2020, cash balances in bank checking and savings accounts of $ 66.9 million and $ 18.4 million, respectively, were valued using Level 1 of the fair value hierarchy. On September 30, 2021 and December 31, 2020, highly liquid money market funds of $ 200.2 million and $ 55.1 million, respectively, were valued using Level 1 of the fair value hierarchy, quoted prices in active markets for identical assets, and are included in cash equivalents.

Balance Sheets Components

Balance Sheets Components	9 Months Ended
	Sep. 30, 2021
Balance Sheet Related Disclosures [Abstract]
Balance Sheets Components	Note 4. Balance Sheet Components Accounts Receivable, net Accounts receivable, net consisted of the following: As of September 30, 2021 December 31, 2020 (in thousands) Accounts receivable, gross $ 32,516 $ 23,970 Allowance for credit losses ( 50 ) ( 50 ) Accounts receivable, net $ 32,466 $ 23,920 Inventories Inventories consisted of the following: As of September 30, 2021 December 31, 2020 (in thousands) Raw materials $ 1,015 $ 435 Work in progress 14,306 10,184 Finished goods 4,314 1,731 Total inventories $ 19,635 $ 12,350 Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets consisted of the following: As of September 30, 2021 December 31, 2020 (in thousands) Advance to suppliers $ 95 $ 853 Prepaid expenses 2,409 1,074 Other current assets 1,402 722 Total prepaid expenses and other current assets $ 3,906 $ 2,649 Property and Equipment, Net Property and equipment, net consisted of the following: As of September 30, 2021 December 31, 2020 (in thousands) Lab and manufacturing equipment $ 43,389 $ 21,958 Computer Equipment 1,693 1,121 Furniture and fixtures 360 237 Construction in progress 638 638 Leasehold improvements 5,198 4,134 51,278 28,088 Accumulated depreciation ( 19,932 ) ( 16,380 ) Total property and equipment, net $ 31,346 $ 11,708 Depreciation expense related to property and equipment was $ 0.7 million, $ 1.9 million, $ 1.0 million, and $ 2.7 million for the three and nine months ended September 30, 2021 and 2020, respectively. Intangible Assets, Net Intangible assets, net consisted of the following: As of September 30, 2021 December 31, 2020 (in thousands) Gross Assets Accumulated Amortization Net Assets Gross Assets Accumulated Amortization Net Assets (in thousands) Internal use software $ 9,434 $ ( 8,681 ) $ 753 $ 9,377 $ ( 8,312 ) $ 1,065 Purchased intangibles 9,652 ( 5,865 ) 3,787 5,663 ( 4,659 ) 1,004 Intangible assets $ 19,086 $ ( 14,546 ) $ 4,540 $ 15,040 $ ( 12,971 ) $ 2,069 Amortization expense for intangible assets was $ 0.5 million, $ 1.6 million, $ 0.3 million, and $ 2.3 million for the three and nine months ended September 30, 2021 and 2020 , respectively. In the three and nine months ended September 30, 2020, the Company recorded impairment charges of $ 0.8 million and $ 1.0 million related to cost of software that was in process of development for internal use. As of September 30, 2021, the Company had $ 0.8 million of intangibles that were still in development stage and were not being amortized, and anticipates the amortization to begin in 2022. The estimated aggregate future amortization expense for intangible assets in development stage and subject to amortization as of September 30, 2021 is summarized as below: (in thousands) 2021 (remainder) $ 503 2022 1,676 2023 1,459 2024 629 2025 and beyond 273 $ 4,540 Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consisted of the following: As of September 30, 2021 December 31, 2020 (in thousands) Accrued payroll and related benefits $ 5,793 $ 5,362 Revenue reserves 4,174 3,063 Deferred non-recurring engineering services 3,881 — Short term lease liability 1,411 1,264 Other accrued expenses 5,205 3,274 Total accrued expenses and other current liabilities $ 20,464 $ 12,963

Leases

Leases	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Leases	Note 5. Leases The Company leases real estate property under operating leases. The Company leases office space in Santa Clara, Michigan, Malaysia, Japan, Taiwan, the Netherlands, and Ukraine all under non-cancellable operating leases with various expiration dates through March 2027 . In January 2021, the Company signed an amendment to its Santa Clara office space lease where the lessor provided the Company lease incentives of $ 0.4 million and extended the term of the lease by three months . The amendment was accounted as a single modified lease and the remaining payments were remeasured using an updated discount rate. The remaining lease terms vary from a few months to 6 years. For certain of its leases the Company has options to extend the lease term for periods varying from one to five years . These renewal options are not considered in the remaining lease term unless it is reasonably certain that the Company will exercise such options. The Company also has variable lease payments that are primarily comprised of common area maintenance and utility charges. As of September 30, 2021 , the Company did not have any leases that had not yet commenced. The table below presents the lease-related assets and liabilities recorded on the consolidated balance sheet as of September 30, 2021: As of September 30, 2021 December 31, 2020 (in thousands) Right-of-use assets $ 8,341 $ 8,892 Lease liabilities included in accrued expenses and other current liabilities 1,411 1,264 Lease liabilities - non-current 6,356 6,986 Total operating lease liabilities $ 7,767 $ 8,250 Weighted-average remaining lease term (years) 5.3 5.9 Weighted-average discount rate 4.5 % 4.2 % The table below presents certain information related to the lease costs for operating leases for the three and nine months ended September 30, 2021 and 2020: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (in thousands) Operating lease cost $ 396 $ 418 $ 1,278 $ 1,269 Short-term lease cost 86 88 313 253 Variable lease cost 34 37 199 193 Total lease cost $ 516 $ 543 $ 1,790 $ 1,715 Cash paid for operating lease liabilities was $ 0.4 million, $ 1.5 million, $ 0.3 million, and $ 1.9 million, respectively, for the three and nine months ended September 30, 2021 and 2020. Operating Lease Cash Flows The table below reconciles the undiscounted cash flows for each of the first five years and total of the remaining years to the operating lease liabilities recorded on the consolidated balance sheet as of September 30, 2021: (in thousands) 2021 $ 319 2022 1,741 2023 1,586 2024 1,548 2025 1,580 2026 and beyond 2,009 Total minimum lease payments 8,783 Less: amount of lease payments representing interest ( 1,016 ) Present value of future minimum lease payments 7,767 Less: current obligations under leases ( 1,411 ) Long-term lease liabilities $ 6,356

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Stockholders' Equity	Note 6. Stockholders’ Equity On February 22, 2021, the Company completed a follow-on public offering, in which it issued and sold 1,500,000 shares of its common stock and MegaChips sold 1,500,000 of the Company’s common stock held by them at a price of $ 127 per share. Equity Incentive Plans The following table summarizes the restricted stock unit award (“RSU”) and cash restricted stock unit award (“CRSU”), activity for the three and nine months ended September 30, 2021: RSU Grant Date CRSU Grant Date Number of Fair Value Number of Fair Value Shares per share Shares per share Unvested at December 31, 2020 2,735,706 $ 22.4 624 $ 35.1 Granted 190,838 107.1 3,025 111.9 Vested ( 189,460 ) 22.8 ( 3,405 ) 101.7 Forfeited ( 13,840 ) 13.0 — — Unvested at March 31, 2021 2,723,244 $ 28.2 244 $ 58.4 Granted 103,063 100.5 — — Vested ( 221,049 ) 23.1 — — Forfeited ( 49,880 ) 29.6 ( 244 ) 58.4 Unvested at June 30, 2021 2,555,378 $ 31.5 — $ - Granted 68,992 107.4 — — Vested ( 193,407 ) 27.8 — — Forfeited — — — — Unvested at September 30, 2021 2,430,963 $ 33.9 — $ - On August 4, 2020, the Compensation Committee of the Company adopted and approved the Executive Bonus and Retention Plan (the “Bonus and Retention Plan”). In August 2020, the Compensation Committee approved target bonus amounts and performance goals for the second half of the fiscal year 2020 (the “2020 Goals”), in January 2021, the Compensation Committee approved target bonus amounts and performance goals for the first half of the fiscal year 2021 (the “1H2021 Goals”), and in July 2021 the Compensation Committee approved target bonus amounts and performance goals for the second half of the fiscal year 2021 (the “2H2021 Goals”). The 2020 Goals, the 1H2021 Goals and the 2H2021 Goals are based on the achievement of revenue and Non-GAAP operating profit, as well as individual performance goals. The awards for the actual payouts are granted in the quarter following the end of the performance period. The target bonuses were granted based on a fixed dollar amount to be settled in RSUs on the vesting date and hence the awards have been classified as liability-based awards until settled. Such expense is included in the non-cash adjustment within stock-based compensation expense on the condensed consolidated cash flow statements. The liability of $ 0.6 million for 2H2021 Goals was recorded as accrued expenses and other current liabilities in the condensed consolidated balance sheet as of September 30, 2021. Actual payouts for 2020 Goals ranged from 119 % to 144 % of target, and for 1H2021 Goals ranged from 76 % to 141 % of target, based on performance. In the nine months ended September 30, 2021, the Company granted CRSUs as part of an employee bonus plan. The Company ended such program effective April 1, 2021. Generally, such units were granted quarterly and fully vested at the end of the quarter they were granted except units granted to new hires that had a one-year cliff vesting. Such awards were classified as liability-based awards. Stock-Based Compensation The following table presents the detail of stock-based compensation expense amounts included in the condensed consolidated statement of operations for each of the periods presented: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Equity awards (in thousands) Cost of revenue $ 421 $ 34 $ 1,233 $ 119 Research and development 2,587 1,100 7,695 3,016 Selling, general and administrative 3,763 2,785 10,652 6,614 $ 6,771 $ 3,919 $ 19,580 $ 9,749 Liability-based awards - equity settled Cost of revenue $ 22 $ — $ 72 $ — Research and development 289 145 698 — Selling, general and administrative 306 234 1,187 — $ 617 $ 379 $ 1,957 $ — Total stock-based compensation - equity settled $ 7,388 $ 4,298 $ 21,537 $ 9,749 Liability-based awards - cash settled Cost of revenue $ — $ 98 $ 102 $ 138 Research and development — 140 143 383 Selling, general and administrative — 104 108 392 Total stock-based compensation - cash settled $ — $ 342 $ 353 $ 913 Total stock-based compensation expense $ 7,388 $ 4,640 $ 21,890 $ 10,662 As of September 30, 2021 , there was $ 71.6 million and $ 1.1 million of unrecognized compensation costs related to RSUs granted and liability-based awards granted, respectively. The unrecognized compensation cost is expected to be recognized over a weighted average period of 3.3 years for equity awards and 0.4 years for liability-based awards.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Note 7. Income Taxes The quarterly provision for income taxes is based on applying the estimated annual effective tax rate to the year to date pre-tax income (loss), plus any discrete items. The Company updates its estimate of its annual effective tax rate at the end of each quarterly period. The estimate takes into account annual forecasted income (loss) before income taxes, the geographic mix of income (loss) before income taxes and any significant permanent tax items. The following table presents the provision for income taxes and the effective tax rates for the three and nine months ended September 30, 2021 and 2020: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (in thousands) Income (loss) before income taxes $ 13,964 $ ( 667 ) $ 12,485 $ ( 11,362 ) Income tax expense ( 4 ) — ( 67 ) ( 1 ) Effective tax rate 0 % 0 % - 1 % 0 % The Company’s effective tax rate may vary from the U.S. federal statutory tax rate due to the change in the mix of earnings in tax jurisdictions with different statutory rates, benefits related to tax credits and the tax impact of non-deductible expenses, existence of full valuation allowance on its deferred tax assets, and other permanent differences between income (loss) before income taxes and taxable income (loss). A valuation allowance is established or maintained when, based on currently available information and other factors, it is more likely than not that all or a portion of the deferred tax assets will not be realized. The Company regularly assesses its valuation allowance against deferred tax assets on a jurisdiction by jurisdiction basis. The Company considers all available positive and negative evidence, including future reversals of temporary differences, projected future taxable income, tax planning strategies and recent financial results. Based on management’s assessment of the realizability of deferred tax assets, the Company continues to maintain a full valuation reserve on its deferred tax assets as of September 30, 2021. As of September 30, 2021 and December 31, 2020, the Company had $ 2.4 million and $ 2.4 million, respectively, of total unrecognized tax benefits. If the Company is able to eventually recognize these uncertain tax positions, none of the unrecognized benefit would reduce the Company’s effective tax rate due to the full valuation allowance on the Company’s deferred tax assets. The Company’s policy is to record interest and penalties related to unrecognized tax benefits as income tax expense. For the three and nine months ended September 30, 2021 and 2020 , the Company had immaterial amounts related to the accrual of interest and penalties.

Segment, Geographic and Custome

Segment, Geographic and Customer Information	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Segment, Geographic and Customer Information	Note 8. Segment, Geographic and Customer Information The Company operates in one reportable segment related to the design, development, and sale of silicon timing systems solutions. Revenue by geographic area are presented based upon the ship-to location of the original equipment manufacturers, the contract manufacturers or the distributors who purchased the Company’s products. For sales to the distributors, their geographic location may be different from the geographic locations of the ultimate end customers. The following table sets forth revenue by country for countries with 10% or more of the Company’s revenue during any of the periods presented: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (in thousands) Taiwan $ 16,506 $ 16,126 $ 45,008 $ 34,099 Hong Kong 23,063 9,209 52,054 19,530 United States 5,756 2,263 9,691 5,938 Other 17,704 5,069 36,314 16,315 Total $ 63,029 $ 32,667 $ 143,067 $ 75,882 The Company’s long-lived assets in the U.S. attributable to operations as of September 30, 2021 and December 31, 2020 were 97 % and 97 %, respectively, of total property and equipment, intangible assets and right-of-use assets. Revenue from sales to three of the Company's distributors accounted for 20 %, 17 %, and 8 % of its consolidated revenues for the three months ended September 30, 2021 . Revenue from sales to three of the Company's distributors accounted for 22 %, 16 % and 11 % of its consolidated revenues for the nine months ended September 30, 2021 . Revenue from sales to one end customer through a distributor accounted for 20 % and 23 % for the three and nine months ended September 30, 2021 , respectively. Our end customers predominantly purchase our products from distributors. No other distributors or customers accounted for 10% or more of the Company's consolidated revenues for the three and nine months ended September 30, 2021. Revenue from sales to three of the Company's distributors accounted for 30 %, 16 %, and 15 % of its consolidated revenues for the three months ended September 30, 2020 . Revenue from sales to three of the Company's distributors accounted for 23 %, 19 % and 14 % of its consolidated revenues for the nine months ended September 30, 2020 . Revenue from sales to one end customer through a distributor accounted for 45 % and 36 % for the three and nine months ended September 30, 2020 , respectively. Our end customers predominantly purchase our products from distributors. No other distributors or customers accounted for 10% or more of the Company's consolidated revenues for the three and nine months ended September 30, 2020 .

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 9. Commitments and Contingencies Legal Matters From time to time, the Company may be a party to various litigation claims in the normal course of business. Legal fees and other costs associated with such actions are expensed as incurred. The Company assesses, in conjunction with legal counsel, the need to record a liability for litigation and contingencies. Accrual estimates are recorded when and if it is determined that such a liability for litigation and contingencies are both probable and reasonably estimable. In March 2019, VTT Technical Research Centre of Finland, Ltd. ("VTT") filed suit in the United States District Court for the Northern District of California (“the Court”) alleging infringement by the Company of a patent relating to specific combinations of features set forth in U.S. Patent No. 8,558,643. The complaint sought unspecified monetary damages and injunctive relief. On January 22, 2020, the Company participated in a mediation that had been ordered by the Court. The case was not resolved at the mediation. A Markman Hearing was held on May 15, 2020 relating to a number of different disputed claim terms, and on July 9, 2020 the Court issued a Markman Order relating to those disputed claim terms. Among its determinations, the Court found that one of the disputed claim terms was indefinite, as well as any claim that had this claim term in it. On July 17, 2020, the Court issued a judgment finding all claims of U.S. Patent No. 8,558,643 invalid, based upon its Markman Order. VTT filed a Notice of Appeal of the Court's judgment with the US Court of Appeals for the Federal Circuit (“CAFC”) and filed its opening brief on November 19, 2020 and the Company filed its response brief on January 28, 2021. VTT filed its reply on March 4, 2021. On June 9, 2021, a hearing was held at the CAFC and on June 10, 2021 the CAFC affirmed the Court’s judgment. The Company believes this litigation matter is now fully resolved. Indemnification The Company is a party to a variety of agreements pursuant to which it may be obligated to indemnify other parties to such agreements with respect to certain matters. Typically, these obligations arise in the context of contracts that the Company has entered into, under which the Company customarily agrees to hold the other party harmless against losses arising from a breach of representations and covenants or terms and conditions related to such matters as the sale and/or delivery of its products, title to assets sold, certain intellectual property claims, defective products, specified environmental matters, and certain income taxes. Further, the Company’s obligations under these agreements may be limited in terms of time, amount, or the scope of its responsibility and in some instances, the Company may have recourse against third-parties for certain payments made under these agreements. It is not possible to predict the maximum potential amount of future payments under these agreements due to the conditional nature of the Company’s obligations and the unique facts and circumstances involved in each particular agreement. Historically, the Company has had no material indemnification claims under these agreements.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2021
Related Party Transactions [Abstract]
Related Party Transactions	Note 10. Related Party Transactions The Company entered into an agreement with MegaChips, whereby the Company appointed MegaChips as a non-exclusive sales representative of its products in Japan. The Company sells products through MegaChips to distributors, resellers, or direct customers in Japan. The Company pays MegaChips a fixed percentage of the revenue as sales commission, which is recorded as commission expense and included in sales and marketing in the consolidated statements of operations and comprehensive loss. In connection with our efforts to contract directly with distributors in Japan, on November 3, 2021, we entered into a termination agreement with MegaChips Corporation pursuant to which we agreed to mutually terminate the Distribution Agreement effective November 3, 2021. The Company has also entered into a service and secondment agreement with MegaChips LSI USA Corporation, a wholly owned subsidiary of MegaChips, that terminated on August 31, 2021 . MegaChips is the largest stockholder of the Company and held approximately 31.2 % and 43.7 % of the Company’s outstanding common stock as of September 30, 2021 and December 31, 2020, respectively. In May 2021, the Company signed a consulting agreement with Akira Takata, a member of the Board of Directors of the Company. As a consultant, Mr. Takata will provide sales consulting services through December 31, 2021, for which he will receive monthly cash fees of $ 5,000 , reimbursement of expenses, and an equity award of 500 RSUs that vest on November 20, 2021 . The following is a summary of significant balances, transactions and payments with the related parties and affiliates. As of Balances September 30, 2021 December 31, 2020 (in thousands) MegaChips Accounts receivable $ 5 $ 736 Property and equipment, net — 209 Three Months Ended September 30, Nine Months Ended September 30, Transactions 2021 2020 2021 2020 (in thousands) MegaChips Sales through distribution agreement $ 1,896 $ 1,544 $ 8,166 $ 4,274 License expense — — — 148 Commission expense 79 64 340 176 Affiliates Consulting fees 106 87 231 262 Three Months Ended September 30, Nine Months Ended September 30, Payments 2021 2020 2021 2020 (in thousands) (in thousands) MegaChips Cash paid for commissions $ 79 $ 64 $ 340 $ 176 Cash paid for licenses — — — 25 Affiliates Cash paid for consulting fees 106 87 231 262

The Company and Basis of Pres_2

The Company and Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Outbreak of Coronavirus Disease 2019 ("the COVID-19 pandemic")	Outbreak of Coronavirus Disease 2019 (“the COVID-19 pandemic”) On March 11, 2020, the World Health Organization characterized the outbreak of the coronavirus disease known as COVID-19 as a global pandemic and recommended containment and mitigation measures. On March 13, 2020, the United States declared a national emergency concerning the outbreak, and several states and municipalities have declared public health emergencies. To combat the spread of the COVID-19 pandemic, the United States and other foreign countries in which the Company operates have imposed measures such as quarantines and “shelter-in-place” orders that are restricting business operations and travel and requiring individuals to work from home (“WFH”), which has impacted all aspects of the Company’s business as well as those of the third-parties the Company relies upon for manufacturing, assembly, testing, shipping and other operations. The global health crisis caused by the COVID-19 pandemic has negatively impacted business activity across the globe and has impacted the Company's employees and operations. The inputs into the Company’s judgments and estimates consider the economic implications of the COVID-19 pandemic, as the Company knows them, on the Company’s critical and significant accounting estimates. The extent to which the COVID-19 pandemic may impact the Company’s business will depend on future developments, which are highly uncertain, including the future effects of the COVID-19 pandemic on its employees, customers, suppliers, results of operations, financial condition, or liquidity for the remainder of fiscal year 2021 and beyond . To date, we have experienced minimal impact from any supplier disruption resulting from COVID-19.
Principles of Consolidation	Principles of Consolidation The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation.
Significant Accounting Policies	Significant Accounting Policies The Company’s significant accounting policies are disclosed in the Company’s audited consolidated financial statements and related notes thereto included in the Annual Report on Form 10-K for the year ended December 31, 2020. There had been no changes to these accounting policies except for the recently adopted accounting guidance and non-recurring engineering services as discussed below.
Accounting Standards Recently Adopted/Not Yet Adopted	Recently Adopted Accounting Guidance In December 2019, the Financial Accounting Standard Board (“FASB”) issued Accounting Standard Update (“ASU”) 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which eliminates certain exceptions related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. It also clarifies and simplifies other aspects of the accounting for income taxes. The adoption of this standard on January 1, 2021 did not have any material impact on the Company’s consolidated financial position, results of operations or cash flows. There are no new accounting pronouncements that are pending to be adopted by the Company.
Non-recurring Engineering Services	Non-recurring engineering services The Company has certain contracts to provide non-recurring engineering (NRE) services for research and development arrangements, including cost sharing arrangements, which do not meet the requirement to be accounted for under ASC 606, Revenue from Contracts with Customers. The Company recognizes the advanced payments received from the counterparty as liabilities and recognizes them as an offset to research and development expense as progress toward completion occurs using an input method based on the ratio of costs incurred to date to total estimated costs of the project. Significant judgment is required to estimate the remaining effort to complete the project. These estimates are reassessed throughout the term of the arrangement. A liability of $ 3.9 million and $ 0.7 million was recorded as accrued expenses and other current liabilities, and other non-current liabilities, respectively, in the condensed consolidated balance sheet as of September 30, 2021. For the three and nine months ended September 30, 2021, the Company recorded $ 0.9 million and $ 1.0 million, respectively, as a reduction of research and development expenses in the condensed consolidated statement of operations. There were no reduction of research and development expenses recorded during the three and nine months ended September 30, 2020.

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Summary of Computation of Basic and Diluted Net Loss (Income) per Share	The following table summarizes the computation of basic and diluted net loss (income) per share attributable to common stockholders of the Company: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (in thousands, except per share data) Net income (loss) attributable to common stockholders $ 13,960 $ ( 667 ) $ 12,418 $ ( 11,363 ) Weighted-average shares outstanding Weighted average shares used to compute basic net income (loss) per share 19,149 16,818 18,658 15,737 Dilutive effect of employee equity incentive plans 2,103 — 2,112 — Weighted average shares used to compute diluted net income (loss) per share 21,252 16,818 20,770 15,737 Net income (loss) attributable to common stockholders per share, basic $ 0.73 $ ( 0.04 ) $ 0.67 $ ( 0.72 ) Net income (loss) attributable to common stockholders per share, diluted $ 0.66 $ ( 0.04 ) $ 0.60 $ ( 0.72 )

Balance Sheets Components (Tabl

Balance Sheets Components (Tables)	9 Months Ended
	Sep. 30, 2021
Balance Sheet Related Disclosures [Abstract]
Schedule of Accounts Receivable, Net	Accounts receivable, net consisted of the following: As of September 30, 2021 December 31, 2020 (in thousands) Accounts receivable, gross $ 32,516 $ 23,970 Allowance for credit losses ( 50 ) ( 50 ) Accounts receivable, net $ 32,466 $ 23,920
Schedule of Inventory	Inventories consisted of the following: As of September 30, 2021 December 31, 2020 (in thousands) Raw materials $ 1,015 $ 435 Work in progress 14,306 10,184 Finished goods 4,314 1,731 Total inventories $ 19,635 $ 12,350
Schedule of Prepaid Expenses and Other Current Assets	Prepaid expenses and other current assets consisted of the following: As of September 30, 2021 December 31, 2020 (in thousands) Advance to suppliers $ 95 $ 853 Prepaid expenses 2,409 1,074 Other current assets 1,402 722 Total prepaid expenses and other current assets $ 3,906 $ 2,649
Schedule of Property and Equipment Net	Property and equipment, net consisted of the following: As of September 30, 2021 December 31, 2020 (in thousands) Lab and manufacturing equipment $ 43,389 $ 21,958 Computer Equipment 1,693 1,121 Furniture and fixtures 360 237 Construction in progress 638 638 Leasehold improvements 5,198 4,134 51,278 28,088 Accumulated depreciation ( 19,932 ) ( 16,380 ) Total property and equipment, net $ 31,346 $ 11,708
Schedule of Intangible Assets, Net	Intangible assets, net consisted of the following: As of September 30, 2021 December 31, 2020 (in thousands) Gross Assets Accumulated Amortization Net Assets Gross Assets Accumulated Amortization Net Assets (in thousands) Internal use software $ 9,434 $ ( 8,681 ) $ 753 $ 9,377 $ ( 8,312 ) $ 1,065 Purchased intangibles 9,652 ( 5,865 ) 3,787 5,663 ( 4,659 ) 1,004 Intangible assets $ 19,086 $ ( 14,546 ) $ 4,540 $ 15,040 $ ( 12,971 ) $ 2,069
Schedule of Future Amortization Expense for Intangible Assets	The estimated aggregate future amortization expense for intangible assets in development stage and subject to amortization as of September 30, 2021 is summarized as below: (in thousands) 2021 (remainder) $ 503 2022 1,676 2023 1,459 2024 629 2025 and beyond 273 $ 4,540
Schedule of Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities consisted of the following: As of September 30, 2021 December 31, 2020 (in thousands) Accrued payroll and related benefits $ 5,793 $ 5,362 Revenue reserves 4,174 3,063 Deferred non-recurring engineering services 3,881 — Short term lease liability 1,411 1,264 Other accrued expenses 5,205 3,274 Total accrued expenses and other current liabilities $ 20,464 $ 12,963

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Summary of Lease Related Assets and Liabilities	The table below presents the lease-related assets and liabilities recorded on the consolidated balance sheet as of September 30, 2021: As of September 30, 2021 December 31, 2020 (in thousands) Right-of-use assets $ 8,341 $ 8,892 Lease liabilities included in accrued expenses and other current liabilities 1,411 1,264 Lease liabilities - non-current 6,356 6,986 Total operating lease liabilities $ 7,767 $ 8,250 Weighted-average remaining lease term (years) 5.3 5.9 Weighted-average discount rate 4.5 % 4.2 %
Summary of Lease Costs	The table below presents certain information related to the lease costs for operating leases for the three and nine months ended September 30, 2021 and 2020: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (in thousands) Operating lease cost $ 396 $ 418 $ 1,278 $ 1,269 Short-term lease cost 86 88 313 253 Variable lease cost 34 37 199 193 Total lease cost $ 516 $ 543 $ 1,790 $ 1,715
Summary of Undiscounted Cash Flows	The table below reconciles the undiscounted cash flows for each of the first five years and total of the remaining years to the operating lease liabilities recorded on the consolidated balance sheet as of September 30, 2021: (in thousands) 2021 $ 319 2022 1,741 2023 1,586 2024 1,548 2025 1,580 2026 and beyond 2,009 Total minimum lease payments 8,783 Less: amount of lease payments representing interest ( 1,016 ) Present value of future minimum lease payments 7,767 Less: current obligations under leases ( 1,411 ) Long-term lease liabilities $ 6,356

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Schedule of Stock-based Compensation Expense Amounts Included in Condensed Consolidated Statement of Operations	The following table presents the detail of stock-based compensation expense amounts included in the condensed consolidated statement of operations for each of the periods presented: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Equity awards (in thousands) Cost of revenue $ 421 $ 34 $ 1,233 $ 119 Research and development 2,587 1,100 7,695 3,016 Selling, general and administrative 3,763 2,785 10,652 6,614 $ 6,771 $ 3,919 $ 19,580 $ 9,749 Liability-based awards - equity settled Cost of revenue $ 22 $ — $ 72 $ — Research and development 289 145 698 — Selling, general and administrative 306 234 1,187 — $ 617 $ 379 $ 1,957 $ — Total stock-based compensation - equity settled $ 7,388 $ 4,298 $ 21,537 $ 9,749 Liability-based awards - cash settled Cost of revenue $ — $ 98 $ 102 $ 138 Research and development — 140 143 383 Selling, general and administrative — 104 108 392 Total stock-based compensation - cash settled $ — $ 342 $ 353 $ 913 Total stock-based compensation expense $ 7,388 $ 4,640 $ 21,890 $ 10,662
RSU and CRSU
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Schedule of Restricted Stock Unit Award ("RSU") and Cash Restricted Stock Unit Award (''CRSU'') Activity (Details)	The following table summarizes the restricted stock unit award (“RSU”) and cash restricted stock unit award (“CRSU”), activity for the three and nine months ended September 30, 2021: RSU Grant Date CRSU Grant Date Number of Fair Value Number of Fair Value Shares per share Shares per share Unvested at December 31, 2020 2,735,706 $ 22.4 624 $ 35.1 Granted 190,838 107.1 3,025 111.9 Vested ( 189,460 ) 22.8 ( 3,405 ) 101.7 Forfeited ( 13,840 ) 13.0 — — Unvested at March 31, 2021 2,723,244 $ 28.2 244 $ 58.4 Granted 103,063 100.5 — — Vested ( 221,049 ) 23.1 — — Forfeited ( 49,880 ) 29.6 ( 244 ) 58.4 Unvested at June 30, 2021 2,555,378 $ 31.5 — $ - Granted 68,992 107.4 — — Vested ( 193,407 ) 27.8 — — Forfeited — — — — Unvested at September 30, 2021 2,430,963 $ 33.9 — $ -

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Schedule of Provision for Income Taxes and Effective Tax Rates	The following table presents the provision for income taxes and the effective tax rates for the three and nine months ended September 30, 2021 and 2020: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (in thousands) Income (loss) before income taxes $ 13,964 $ ( 667 ) $ 12,485 $ ( 11,362 ) Income tax expense ( 4 ) — ( 67 ) ( 1 ) Effective tax rate 0 % 0 % - 1 % 0 %

Segment, Geographic and Custo_2

Segment, Geographic and Customer Information (Tables)	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Schedule of Revenue by Country	The following table sets forth revenue by country for countries with 10% or more of the Company’s revenue during any of the periods presented: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (in thousands) Taiwan $ 16,506 $ 16,126 $ 45,008 $ 34,099 Hong Kong 23,063 9,209 52,054 19,530 United States 5,756 2,263 9,691 5,938 Other 17,704 5,069 36,314 16,315 Total $ 63,029 $ 32,667 $ 143,067 $ 75,882

Related Party Transactions (Tab

Related Party Transactions (Tables)	9 Months Ended
	Sep. 30, 2021
Related Party Transactions [Abstract]
Summary of Significant Balances, Transactions and Payments with Related Parties and Affiliates	The following is a summary of significant balances, transactions and payments with the related parties and affiliates. As of Balances September 30, 2021 December 31, 2020 (in thousands) MegaChips Accounts receivable $ 5 $ 736 Property and equipment, net — 209 Three Months Ended September 30, Nine Months Ended September 30, Transactions 2021 2020 2021 2020 (in thousands) MegaChips Sales through distribution agreement $ 1,896 $ 1,544 $ 8,166 $ 4,274 License expense — — — 148 Commission expense 79 64 340 176 Affiliates Consulting fees 106 87 231 262 Three Months Ended September 30, Nine Months Ended September 30, Payments 2021 2020 2021 2020 (in thousands) (in thousands) MegaChips Cash paid for commissions $ 79 $ 64 $ 340 $ 176 Cash paid for licenses — — — 25 Affiliates Cash paid for consulting fees 106 87 231 262

The Company and Basis of Pres_3

The Company and Basis of Presentation - Additional Information (Details) - USD ($)	Feb. 22, 2021	Jun. 16, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Significant Accounting Policies [Line Items]
Accrued expenses and other current liabilities			$ 20,464,000		$ 20,464,000		$ 12,963,000
Reduction of research and development expense			900,000	$ 0	1,000,000	$ 0
Non-recurring Engineering Services
Significant Accounting Policies [Line Items]
Accrued expenses and other current liabilities			3,900,000		3,900,000
Accrued expenses and other non current liabilities			$ 700,000		$ 700,000
Follow-on Public Offering
Significant Accounting Policies [Line Items]
Proceeds from public offering, net of underwriting discounts and commissions	$ 181,600,000	$ 45,800,000
Payments for underwriting discounts and commissions	8,600,000	2,700,000
Deferred offering costs	$ 300,000	$ 300,000
Si Time Corporation | Follow-on Public Offering
Significant Accounting Policies [Line Items]
Issuance of common stock upon follow-on public offering net of underwriting discounts and commissions and deferred offerings costs, Shares	1,500,000	1,525,000
MegaChips | Follow-on Public Offering
Significant Accounting Policies [Line Items]
Issuance of common stock upon follow-on public offering net of underwriting discounts and commissions and deferred offerings costs, Shares	1,500,000	2,500,000
MegaChips | Si Time Corporation
Significant Accounting Policies [Line Items]
Percentage of outstanding common stock held			31.20%		31.20%

Net Income (Loss) Per Share - S

Net Income (Loss) Per Share - Summary of Computation of Basic and Diluted Net Loss (Income) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income (loss) attributable to common stockholders	$ 13,960	$ (667)	$ 12,418	$ (11,363)
Weighted-average shares outstanding
Weighted average shares used to compute basic net income (loss) per share	19,149	16,818	18,658	15,737
Dilutive effect of employee equity incentive plans	2,103		2,112
Weighted average shares used to compute diluted net income (loss) per share	21,252	16,818	20,770	15,737
Net income (loss) attributable to common stockholders per share, basic	$ 0.73	$ (0.04)	$ 0.67	$ (0.72)
Net income (loss) attributable to common stockholders per share, diluted	$ 0.66	$ (0.04)	$ 0.60	$ (0.72)

Net Income (Loss) Per Share (Ad

Net Income (Loss) Per Share (Additional Information) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Anti-dilutive weighted shares	0	2,835,076	5,350	2,902,824

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - Level 1 - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash balances in bank	$ 66.9	$ 18.4
Highly liquid money market funds	$ 200.2	$ 55.1

Balance Sheets Components - Sch

Balance Sheets Components - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable, gross	$ 32,516	$ 23,970
Allowance for credit losses	(50)	(50)
Accounts receivable, net	$ 32,466	$ 23,920

Balance Sheets Components - S_2

Balance Sheets Components - Schedule of Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 1,015	$ 435
Work in progress	14,306	10,184
Finished goods	4,314	1,731
Total inventories	$ 19,635	$ 12,350

Balance Sheets Components - S_3

Balance Sheets Components - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Prepaid Expense and Other Assets, Current [Abstract]
Advance to suppliers	$ 95	$ 853
Prepaid expenses	2,409	1,074
Other current assets	1,402	722
Total prepaid expenses and other current assets	$ 3,906	$ 2,649

Balance Sheets Components - S_4

Balance Sheets Components - Schedule of Property and Equipment Net (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 51,278	$ 28,088
Accumulated depreciation	(19,932)	(16,380)
Total property and equipment, net	31,346	11,708
Lab and Manufacturing Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	43,389	21,958
Computer Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,693	1,121
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	360	237
Construction in Progress
Property Plant And Equipment [Line Items]
Property and equipment, gross	638	638
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 5,198	$ 4,134

Balance Sheets Components - Add

Balance Sheets Components - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Balance Sheet Related Disclosures [Abstract]
Depreciation expense	$ 700	$ 1,900	$ 1,000	$ 2,700
Amortization expense for intangible assets	500	1,600	300	2,300
Impairment of internal-use software		$ 800		$ 959
Intangibles Assets not amortized	$ 800		$ 800

Balance Sheets Components - S_5

Balance Sheets Components - Schedule of Intangible Assets Net (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Finite Lived Intangible Assets [Line Items]
Gross Assets	$ 19,086	$ 15,040
Accumulated Amortization	(14,546)	(12,971)
Net Assets	4,540	2,069
Internal use software
Finite Lived Intangible Assets [Line Items]
Gross Assets	9,434	9,377
Accumulated Amortization	(8,681)	(8,312)
Net Assets	753	1,065
Purchased intangibles
Finite Lived Intangible Assets [Line Items]
Gross Assets	9,652	5,663
Accumulated Amortization	(5,865)	(4,659)
Net Assets	$ 3,787	$ 1,004

Balance Sheets Components - S_6

Balance Sheets Components - Schedule of Future Amortization Expense for Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2021 (remainder)	$ 503
2022	1,676
2023	1,459
2024	629
2025 and beyond	273
Net Assets	$ 4,540	$ 2,069

Balance Sheets Components - S_7

Balance Sheets Components - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Accrued payroll and related benefits	$ 5,793	$ 5,362
Revenue reserves	4,174	3,063
Deferred non-recurring engineering services	3,881
Short term lease liability	1,411	1,264
Other accrued expenses	5,205	3,274
Total accrued expenses and other current liabilities	$ 20,464	$ 12,963

Leases - Additional Information

Leases - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Lease Disclosure [Line Items]
Leases not yet commenced			Company did not have any leases that had not yet commenced.
Cash paid for operating lease liabilities	$ 0.4	$ 1.5	$ 0.3	$ 1.9
Office Space
Lease Disclosure [Line Items]
Lease term expiration date			Mar. 31, 2027
Lease option to extend			The remaining lease terms vary from a few months to 6 years. For certain of its leases the Company has options to extend the lease term for periods varying from one to five years.
Option to extend			true
Lease incentives received			$ 0.4
Extended term of leases			3 months
Office Space | Maximum
Lease Disclosure [Line Items]
Lease term	6 years		6 years
Operating lease, renewal term	5 years		5 years
Office Space | Minimum
Lease Disclosure [Line Items]
Operating lease, renewal term	1 year		1 year

Leases - Summary of Lease Relat

Leases - Summary of Lease Related Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Right-of-use assets, net	$ 8,341	$ 8,892
Lease liabilities included in accrued expenses and other current liabilities	1,411	1,264
Long-term lease liabilities	6,356	6,986
Total operating lease liabilities	$ 7,767	$ 8,250
Weighted-average remaining lease term (years)	5 years 3 months 18 days	5 years 10 months 24 days
Weighted-average discount rate	4.50%	4.20%

Leases - Summary of Lease Costs

Leases - Summary of Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Operating lease cost	$ 396	$ 418	$ 1,278	$ 1,269
Short-term lease cost	86	88	313	253
Variable lease cost	34	37	199	193
Total lease cost	$ 516	$ 543	$ 1,790	$ 1,715

Leases - Summary of Undiscounte

Leases - Summary of Undiscounted Cash Flows (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Leases [Abstract]
2021	$ 319
2022	1,741
2023	1,586
2024	1,548
2025	1,580
2026 and beyond	2,009
Total minimum lease payments	8,783
Less: amount of lease payments representing interest	(1,016)
Total operating lease liabilities	7,767	$ 8,250
Less: current obligations under leases	(1,411)	(1,264)
Long-term lease liabilities	$ 6,356	$ 6,986

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Feb. 22, 2021	Jun. 16, 2020	Sep. 30, 2021	Dec. 31, 2020	Aug. 04, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Accrued expenses and other current liabilities			$ 20,464	$ 12,963
Second Half of 2021 Goals
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Accrued expenses and other current liabilities			600
Restricted Stock Units RSU
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation costs			71,600
Liability-based Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation costs			$ 1,100
Unrecognized compensation cost is expected weighted average period			4 months 24 days
Equity Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost is expected weighted average period			3 years 3 months 18 days
New Hires | Cash Restricted Stock Unit Award CRSU
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period			1 year
Minimum | 2020 Goals
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage actual payouts					119.00%
Minimum | First Half of 2021 One Goals
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage actual payouts			76.00%
Maximum | 2020 Goals
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage actual payouts					144.00%
Maximum | First Half of 2021 One Goals
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage actual payouts			141.00%
Si Time Corporation | Follow-on Public Offering
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of common stock upon follow-on public offering net of underwriting discounts and commissions and deferred offerings costs, Shares	1,500,000	1,525,000
MegaChips | Follow-on Public Offering
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of common stock upon follow-on public offering net of underwriting discounts and commissions and deferred offerings costs, Shares	1,500,000
MegaChips | Si Time Corporation | Follow-on Public Offering
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued price per share	$ 127

Stockholders' Equity - Schedule

Stockholders' Equity - Schedule of Restricted Stock Unit Award ("RSU") and Cash Restricted Stock Unit Award (''CRSU'') Activity (Details) - $ / shares	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
Restricted Stock Units RSU
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Unvested Beginning Balance	2,555,378	2,723,244	2,735,706
Number of Shares, Granted	68,992	103,063	190,838
Number of Shares, Vested	(193,407)	(221,049)	(189,460)
Number of Shares, Forfeited		(49,880)	(13,840)
Number of Shares, Unvested Ending Balance	2,430,963	2,555,378	2,723,244
Grant Date Fair Value per share, Unvested Beginning Balance	$ 31.5	$ 28.2	$ 22.4
Grant Date Fair Value per share, Granted	107.4	100.5	107.1
Grant Date Fair Value per share, Vested	27.8	23.1	22.8
Grant Date Fair Value per share, Forfeited		29.6	13
Grant Date Fair Value per share, Unvested Ending Balance	$ 33.9	$ 31.5	$ 28.2
Cash Restricted Stock Unit Award CRSU
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Unvested Beginning Balance		244	624
Number of Shares, Granted			3,025
Number of Shares, Vested			(3,405)
Number of Shares, Forfeited		(244)
Number of Shares, Unvested Ending Balance			244
Grant Date Fair Value per share, Unvested Beginning Balance		$ 58.4	$ 35.1
Grant Date Fair Value per share, Granted			111.9
Grant Date Fair Value per share, Vested			101.7
Grant Date Fair Value per share, Forfeited		$ 58.4
Grant Date Fair Value per share, Unvested Ending Balance			$ 58.4

Stockholders' Equity - Schedu_2

Stockholders' Equity - Schedule of Stock-based Compensation Expense Amounts Included in Condensed Consolidated Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 7,388	$ 4,640	$ 21,890	$ 10,662
Equity Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	6,771	3,919	19,580	9,749
Equity Awards | Cost of Revenue
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	421	34	1,233	119
Equity Awards | Selling, General and Administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	3,763	2,785	10,652	6,614
Equity Awards | Research and Development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	2,587	1,100	7,695	3,016
Liability-based Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	617	379	1,957
Liability-based Awards | Cost of Revenue
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	22		72
Liability-based Awards | Selling, General and Administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	306	234	1,187
Liability-based Awards | Research and Development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	289	145	698
Equity Awards and Liability Based Awards - Equity Settled
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 7,388	4,298	21,537	9,749
Liability Based Awards - Cash Settled
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		342	353	913
Liability Based Awards - Cash Settled | Cost of Revenue
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		98	102	138
Liability Based Awards - Cash Settled | Selling, General and Administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		104	108	392
Liability Based Awards - Cash Settled | Research and Development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 140	$ 143	$ 383

Income Taxes - Schedule of Prov

Income Taxes - Schedule of Provision for Income Taxes and Effective Tax Rates (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ 13,964	$ (667)	$ 12,485	$ (11,362)
Income tax expense	$ (4)		$ (67)	$ (1)
Effective tax rate	0.00%	0.00%	1.00%	0.00%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 2.4	$ 2.4

Segment, Geographic and Custo_3

Segment, Geographic and Customer Information - Additional Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021Distributor	Sep. 30, 2020Distributor	Sep. 30, 2021DistributorSegment	Sep. 30, 2020Distributor	Dec. 31, 2020
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			1
Percentage of long lived assets	97.00%		97.00%		97.00%
Revenue Benchmark | Distributor Concentration Risk
Segment Reporting Information [Line Items]
Number of distributors accounted for 10% or more of revenues	0	0	0	0
Revenue Benchmark | Customer Concentration Risk
Segment Reporting Information [Line Items]
Number of customers accounted for 10% or more of revenues	0	0	0	0
Revenue Benchmark | Distributor One | Distributor Concentration Risk
Segment Reporting Information [Line Items]
Sales revenue percentage	20.00%	30.00%	22.00%	23.00%
Revenue Benchmark | Distributor One | Customer Concentration Risk
Segment Reporting Information [Line Items]
Sales revenue percentage	20.00%	45.00%	23.00%	36.00%
Revenue Benchmark | Distributor Two | Distributor Concentration Risk
Segment Reporting Information [Line Items]
Sales revenue percentage	17.00%	16.00%	16.00%	19.00%
Revenue Benchmark | Distributor Three | Distributor Concentration Risk
Segment Reporting Information [Line Items]
Sales revenue percentage	8.00%	15.00%	11.00%	14.00%

Segment, Geographic and Custo_4

Segment, Geographic and Customer Information - Schedule of Revenue by Country (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 63,029	$ 32,667	$ 143,067	$ 75,882
Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Revenue	63,029	32,667	143,067	75,882
Taiwan | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Revenue	16,506	16,126	45,008	34,099
Hong Kong | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Revenue	23,063	9,209	52,054	19,530
United States | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Revenue	5,756	2,263	9,691	5,938
Other | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Revenue	$ 17,704	$ 5,069	$ 36,314	$ 16,315

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Details) - USD ($)	Aug. 31, 2021	May 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Restricted Stock Units RSU
Related Party Transaction [Line Items]
Equity award, granted			68,992	103,063	190,838
MegaChips
Related Party Transaction [Line Items]
Agreement termination date	Aug. 31, 2021
MegaChips | Si Time Corporation
Related Party Transaction [Line Items]
Percentage of outstanding common stock held			31.20%			43.70%
Akira Takata
Related Party Transaction [Line Items]
Sales consulting services fee		$ 5,000
Akira Takata | Restricted Stock Units RSU
Related Party Transaction [Line Items]
Equity award, granted		500
Equity award, vesting date		Nov. 20, 2021

Related Party Transactions - Su

Related Party Transactions - Summary of Significant Balances, Transactions and Payments with Related Parties and Affiliates (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Related party accounts receivable	$ 5		$ 5		$ 736
MegaChips
Related Party Transaction [Line Items]
Related party accounts receivable	5		5		736
Property and equipment, net					$ 209
Sales through distribution agreement	1,896	$ 1,544	8,166	$ 4,274
License expense				148
Commission expense	79	64	340	176
Cash paid for commissions	79	64	340	176
Cash paid for licenses				25
Affliates
Related Party Transaction [Line Items]
Consulting fees	106	87	231	262
Cash paid for consulting fees	$ 106	$ 87	$ 231	$ 262