Kingsoft Cloud Holdings Limited (KC) 20-F 22 Apr 21 2020 FY Annual report (foreign) Financial data

Cover Page

Cover Page	12 Months Ended
	Dec. 31, 2020shares
Document Information [Line Items]
Document Type	20-F
Amendment Flag	false
Document Registration Statement	false
Document Annual Report	true
Document Transition Report	false
Document Shell Company Report	false
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Registrant Name	Kingsoft Cloud Holdings Ltd
Entity Central Index Key	0001795589
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding	3,339,618,633
Entity Shell Company	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Interactive Data Current	Yes
Document Accounting Standard	U.S. GAAP
Entity File Number	001-39278
Entity Incorporation, State or Country Code	E9
Entity Address, Address Line One	Building E, Xiaomi Science and Technology Park, No. 33 Xierqi Middle Road
Entity Address, Address Line Two	Haidian District
Entity Address, City or Town	Beijing
Entity Address, Postal Zip Code	100085
Entity Address, Country	CN
ICFR Auditor Attestation Flag	false
American Depositary Shares [Member]
Document Information [Line Items]
Title of 12(b) Security	American depositary shares, each ADS represents 15 ordinary shares, par value US$0.001 per share
Trading Symbol	KC
Security Exchange Name	NASDAQ
Ordinary Shares [Member]
Document Information [Line Items]
Title of 12(b) Security	Ordinary shares, par value US$0.001 per share
No Trading Symbol Flag	true
Security Exchange Name	NASDAQ

Consolidated Balance Sheets

Consolidated Balance Sheets ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
Current assets:
Cash and cash equivalents	¥ 3,424,674	$ 524,854	¥ 2,023,263
Accounts receivable, net of allowance of RMB22,894 and RMB15,770 (US$2,417) as of December 31, 2019 and 2020, respectively	2,334,871	357,835	1,347,481
Short-term investments	2,693,019	412,723	225,425
Prepayments and other assets	887,086	135,952	421,938
Amounts due from related parties	205,068	31,428	131,632
Total current assets	9,544,718	1,462,792	4,149,739
Non-current assets:
Property and equipment, net	1,956,790	299,891	1,720,974
Intangible assets, net	16,573	2,540	7,428
Prepayments and other assets	11,824	1,812	36,468
Equity investments	126,583	19,400	114,876
Amounts due from related parties	5,758	882	2,336
Operating lease right-of-use assets	266,968	40,915
Total non-current assets	2,384,496	365,440	1,882,082
Total assets	11,929,214	1,828,232	6,031,821
Current liabilities (including current liabilities of the consolidated VIEs without recourse to the primary beneficiary of RMB2,168,169 and RMB3,000,675 (US$459,873) as of December 31, 2019 and 2020, respectively):
Accounts payable	2,057,355	315,303	1,254,589
Accrued expenses and other liabilities	845,374	129,559	949,213
Short-term bank loans	278,488	42,680
Long-term bank loan, current portion	74,351	11,395	100,000
Income tax payable	20,564	3,152	11,930
Amounts due to related parties	112,998	17,318	104,259
Current operating lease liabilities	76,469	11,719
Total current liabilities	3,465,599	531,126	2,419,991
Non-current liabilities (including non-current liabilities of the consolidated VIEs without recourse to the primary beneficiary of RMB74,557 and RMB153,061 (US$23,457) as of December 31, 2019 and 2020, respectively):
Long-term bank loan			74,351
Deferred tax liabilities	29	4	206
Other liabilities	40,578	6,219
Non-current operating lease liabilities	182,958	28,040
Total non-current liabilities	223,565	34,263	74,557
Total liabilities	3,689,164	565,389	2,494,548
Commitments and contingencies
Mezzanine equity:
Total mezzanine equity			7,734,532
Shareholders' (deficit) equity:
Series A convertible preferred shares			123,186
Ordinary shares	22,801	3,494	5,558
Additional paid-in capital	14,149,984	2,168,580	91,746
Accumulated deficit	(5,864,356)	(898,751)	(4,902,097)
Accumulated other comprehensive income (loss)	(68,440)	(10,489)	484,348
Total Kingsoft Cloud Holdings Limited shareholders' (deficit) equity	8,239,989	1,262,834	(4,197,259)
Noncontrolling interests	61	9
Total (deficit) equity	8,240,050	1,262,843	(4,197,259)
Total liabilities, mezzanine equity and shareholders' (deficit) equity	¥ 11,929,214	$ 1,828,232	6,031,821
Series B Convertible Preferred Shares [Member]
Mezzanine equity:
Series redeemable convertible preferred shares			337,268
Series C Redeemable Convertible Preferred Shares [Member]
Mezzanine equity:
Series redeemable convertible preferred shares			1,043,147
Series D Redeemable Convertible Preferred Shares [Member]
Mezzanine equity:
Series redeemable convertible preferred shares			5,965,273
Series D+ Redeemable Convertible Preferred Shares [Member]
Mezzanine equity:
Series redeemable convertible preferred shares			¥ 388,844

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)shares	Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2019CNY (¥)shares	Dec. 31, 2019$ / shares
Accounts receivable, net	¥ 15,770	$ 2,417	¥ 22,894
Current liabilities	3,465,599	531,126	2,419,991
Non Current liabilities	¥ 223,565	$ 34,263	¥ 74,557
Common Stock, Par or Stated Value Per Share | $ / shares		$ 0.001		$ 0.001
Common stock shares authorised	4,000,000,000	4,000,000,000	1,282,750,429
Common Stock, Shares, Issued	3,546,124,955	3,546,124,955	1,077,086,304
Common Stock, Shares, Outstanding	3,339,618,633	3,339,618,633	894,711,200
Series A Convertible Preferred Shares [Member]
Temporary Equity, Par or Stated Value Per Share | $ / shares		$ 0.001		0.001
Temporary Equity, Shares Authorized	0	0	458,116,000
Temporary Equity, Shares Issued	0	0	458,116,000
Temporary Equity, Shares Outstanding	0	0	458,116,000
Series B Convertible Preferred Shares [Member]
Temporary Equity, Par or Stated Value Per Share | $ / shares		$ 0.001		0.001
Temporary Equity, Shares Authorized	0	0	153,603,600
Temporary Equity, Shares Issued	0	0	153,603,600
Temporary Equity, Shares Outstanding	0	0	153,603,600
Series C Redeemable Convertible Preferred Shares [Member]
Temporary Equity, Par or Stated Value Per Share | $ / shares		$ 0.001		0.001
Temporary Equity, Shares Authorized	0	0	185,665,192
Temporary Equity, Shares Issued	0	0	185,665,192
Temporary Equity, Shares Outstanding	0	0	185,665,192
Series D Redeemable Convertible Preferred Shares [Member]
Temporary Equity, Par or Stated Value Per Share | $ / shares		$ 0.001		0.001
Temporary Equity, Shares Authorized	0	0	842,738,782
Temporary Equity, Shares Issued	0	0	842,738,782
Temporary Equity, Shares Outstanding	0	0	842,738,782
Series D+ Redeemable Convertible Preferred Shares [Member]
Temporary Equity, Par or Stated Value Per Share | $ / shares		$ 0.001		$ 0.001
Temporary Equity, Shares Authorized	0	0	77,125,997
Temporary Equity, Shares Issued	0	0	55,089,998
Temporary Equity, Shares Outstanding	0	0	55,089,998
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
Current liabilities	¥ 3,000,675	$ 459,873	¥ 2,168,169
Non Current liabilities	¥ 153,061	$ 23,457	¥ 74,557

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)¥ / sharesshares	Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2019CNY (¥)¥ / sharesshares	Dec. 31, 2018CNY (¥)¥ / sharesshares
Revenues:
Revenues	¥ 6,577,307	$ 1,008,017	¥ 3,956,353	¥ 2,218,172
Cost of revenues (including related party amounts of RMB18,868, RMB660 and RMB988 (US$151) for the years ended December 31, 2018, 2019 and 2020, respectively)	(6,220,324)	(953,306)	(3,948,644)	(2,418,562)
Gross (loss) profit	356,983	54,711	7,709	(200,390)
Operating expenses:
Selling and marketing expenses	(409,211)	(62,714)	(317,426)	(191,671)
General and administrative expenses	(379,892)	(58,221)	(238,648)	(146,846)
Research and development expenses	(775,130)	(118,794)	(595,169)	(440,518)
Total operating expenses	(1,564,233)	(239,729)	(1,151,243)	(779,035)
Operating loss	(1,207,250)	(185,018)	(1,143,534)	(979,425)
Interest income	77,118	11,819	78,612	116,500
Interest expense	(9,453)	(1,449)	(4,925)	(38,826)
Foreign exchange (loss) gain	188,800	28,935	(38,961)	(102,202)
Changes in fair value of financial instruments	14,301	2,192		6,404
Other income (expenses), net	(10,810)	(1,657)	6,612	739
Loss before income taxes	(947,294)	(145,178)	(1,102,196)	(996,810)
Income tax expense	(14,904)	(2,284)	(9,003)	(9,632)
Net loss	(962,198)	(147,462)	(1,111,199)	(1,006,442)
Less: net income attributable to noncontrolling interests	61	9
Net loss attributable to Kingsoft Cloud Holdings Limited	(962,259)	(147,471)	(1,111,199)	(1,006,442)
Accretion to redemption value of redeemable convertible preferred shares	(19,768)	(3,030)	(49,725)	(742,472)
Net loss attributable to ordinary shareholders	¥ (982,027)	$ (150,501)	¥ (1,160,924)	¥ (1,748,914)
Net loss per share:
Basic and diluted | (per share)	¥ (0.41)	$ (0.06)	¥ (1.31)	¥ (2.20)
Shares used in the net loss per share computation:
Basic and diluted	2,400,874,197	2,400,874,197	889,521,200	793,430,000
Other comprehensive income (loss), net of tax of nil:
Foreign currency translation adjustments	¥ (552,788)	$ (84,718)	¥ 64,598	¥ 401,820
Comprehensive loss	(1,514,986)	(232,180)	(1,046,601)	(604,622)
Less: Comprehensive income attributable to noncontrolling interests	61	9
Comprehensive loss attributable to Kingsoft Cloud Holdings Limited shareholders	(1,515,047)	(232,189)	(1,046,601)	(604,622)
Accretion to redemption value of redeemable convertible preferred shares	(19,768)	(3,030)	(49,725)	(742,472)
Comprehensive loss attributable to ordinary shareholders	(1,534,815)	(235,219)	(1,096,326)	(1,347,094)
Public cloud service [Member]
Revenues:
Revenues	5,166,851	791,855	3,458,843	2,110,513
Enterprise Cloud Services [Member]
Revenues:
Revenues	1,372,689	210,374	486,308	94,369
Others [Member]
Revenues:
Revenues	¥ 37,767	$ 5,788	¥ 11,202	¥ 13,290

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Loss (Parenthetical) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
Revenue from Related Parties	¥ 777,369	$ 119,137	¥ 688,307	¥ 630,511
Cost from Related Parties	988	151	660	18,868
Public cloud services [Member]
Revenue from Related Parties	777,287	119,124	688,187	630,511
Others [Member]
Revenue from Related Parties	¥ 82	$ 13	¥ 120	¥ 0

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' (Deficit) Equity ¥ in Thousands, $ in Thousands		CNY (¥)	USD ($)	IPO [Member]CNY (¥)	Series B Converted Preferred Shares and Series C, D and D+ Redeemable Converted Preferred Shares [Member]CNY (¥)	Follow on offering [Member]CNY (¥)	Common Stock [Member]CNY (¥)shares		Common Stock [Member]USD ($)shares		Common Stock [Member]IPO [Member]CNY (¥)shares	Common Stock [Member]Series B Converted Preferred Shares and Series C, D and D+ Redeemable Converted Preferred Shares [Member]CNY (¥)shares		Common Stock [Member]Follow on offering [Member]CNY (¥)shares	Additional Paid-in Capital [Member]CNY (¥)	Additional Paid-in Capital [Member]USD ($)	Additional Paid-in Capital [Member]IPO [Member]CNY (¥)	Additional Paid-in Capital [Member]Series B Converted Preferred Shares and Series C, D and D+ Redeemable Converted Preferred Shares [Member]CNY (¥)	Additional Paid-in Capital [Member]Follow on offering [Member]CNY (¥)	AOCI Attributable to Parent [Member]CNY (¥)	AOCI Attributable to Parent [Member]USD ($)	Retained Earnings [Member]CNY (¥)	Retained Earnings [Member]USD ($)	Total Kingsoft Cloud Holdings Limited shareholdersdeficit equity [Member]CNY (¥)	Total Kingsoft Cloud Holdings Limited shareholdersdeficit equity [Member]USD ($)	Total Kingsoft Cloud Holdings Limited shareholdersdeficit equity [Member]IPO [Member]CNY (¥)	Total Kingsoft Cloud Holdings Limited shareholdersdeficit equity [Member]Series B Converted Preferred Shares and Series C, D and D+ Redeemable Converted Preferred Shares [Member]CNY (¥)	Total Kingsoft Cloud Holdings Limited shareholdersdeficit equity [Member]Follow on offering [Member]CNY (¥)	Non-Controlling InterestsCNY (¥)	Non-Controlling InterestsUSD ($)	Series A Convertible Preferred Shares [Member]CNY (¥)shares
Balance (In shares) at Dec. 31, 2017 | shares							793,430,000	[1]	793,430,000	[1]																					458,116,000
Balance at Dec. 31, 2017		¥ (1,942,958)					¥ 4,851													¥ 17,930		¥ (2,088,925)									¥ 123,186
Net loss for the year		(1,006,442)																				(1,006,442)
Accretion to redemption value of redeemable convertible preferred shares		(742,472)													¥ (46,941)							(695,531)
Other comprehensive income		401,820																		401,820
Share-based compensation		46,941													46,941
Balance (In shares) at Dec. 31, 2018 | shares							793,430,000	[1]	793,430,000	[1]																					458,116,000
Balance at Dec. 31, 2018		(3,243,111)					¥ 4,851													419,750		(3,790,898)									¥ 123,186
Net loss for the year		(1,111,199)																				(1,111,199)
Accretion to redemption value of redeemable convertible preferred shares		(49,725)													(49,725)
Other comprehensive income		64,598																		64,598
Share-based compensation		121,279													121,279
Exercise and vesting of share-based awards (In shares) | shares	[1]						101,281,200		101,281,200
Exercise and vesting of share-based awards		20,899					¥ 707								20,192
Balance (In shares) at Dec. 31, 2019 | shares							894,711,200	[1]	894,711,200	[1]																					458,116,000
Balance at Dec. 31, 2019		(4,197,259)					¥ 5,558								91,746					484,348		(4,902,097)		¥ (4,197,259)							¥ 123,186
Net loss for the year		(962,198)	$ (147,462)																			(962,259)		(962,259)					¥ 61
Accretion to redemption value of redeemable convertible preferred shares		(19,768)	(3,030)												(19,768)									(19,768)
Repurchase of ordinary shares (In shares) | shares	[1]						(5,475,254)		(5,475,254)
Repurchase of ordinary shares		(26,700)					¥ (38)								(26,662)									(26,700)
Issuance of ordinary shares (In shares) | shares	[1]										517,500,000			138,750,000
Issuance of ordinary shares				¥ 3,875,394		¥ 1,881,233					¥ 3,663			¥ 945			¥ 3,871,731		¥ 1,880,288							¥ 3,875,394		¥ 1,881,233
Conversion of Series A, Series B convertible preferred shares and Series C, Series D and Series D+ redeemable convertible preferred shares into ordinary shares (In shares) | shares							458,116,000	[1]	458,116,000	[1]		1,259,133,571	[1]																		(458,116,000)
Conversion of Series A, Series B convertible preferred shares and Series C, Series D and Series D+ redeemable convertible preferred shares into ordinary shares					¥ 7,889,115		¥ 3,243					¥ 8,913			119,943			¥ 7,880,202									¥ 7,889,115				¥ (123,186)
Other comprehensive income		(552,788)																		(552,788)				(552,788)
Share-based compensation		330,114													330,114									330,114
Exercise and vesting of share-based awards (In shares) | shares	[1]						76,883,116		76,883,116
Exercise and vesting of share-based awards		22,907					¥ 517								22,390									22,907
Balance (In shares) at Dec. 31, 2020 | shares	[1]						3,339,618,633		3,339,618,633
Balance at Dec. 31, 2020		¥ 8,240,050	$ 1,262,843				¥ 22,801		$ 3,494						¥ 14,149,984	$ 2,168,580				¥ (68,440)	$ (10,489)	¥ (5,864,356)	$ (898,751)	¥ 8,239,989	$ 1,262,834				¥ 61	$ 9
[1]	As of December 31, 2019 and 2020, 182,375,104 and 206,506,322 ordinary shares, respectively, were held by share based payment vehicles in relation to the share awards. These shares are legally issued but not outstanding.

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' (Deficit) Equity (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Stock Issued During Period, Shares, Issued for Services	206,506,322	182,375,104

Consolidated Statements of Cash

Consolidated Statements of Cash Flows ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	¥ (962,198)	$ (147,462)	¥ (1,111,199)	¥ (1,006,442)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	758,038	116,174	604,581	412,352
Share-based compensation	330,114	50,592	121,279	46,941
Allowance for doubtful accounts	31,881	4,886	20,645	66
Gain on disposal of property and equipment	(2,242)	(344)	(74)	(244)
Changes in fair value of financial instruments	(14,301)	(2,192)		(6,404)
Issuance costs expensed for follow-on offering	3,727	571
Foreign exchange loss (gain)	(188,800)	(28,935)	38,961	102,202
Non-cash operating lease expense	52,890	8,106
Changes in operating assets and liabilities:
Accounts receivable	(1,024,113)	(156,952)	(823,033)	(46,721)
Prepayment and other assets	(356,761)	(54,676)	(5,883)	(25,249)
Amounts due from related parties	(75,315)	(11,543)	84,981	5,268
Accounts payable	804,198	123,249	533,771	260,090
Accrued expenses and other liabilities	381,001	58,391	103,276	(132,973)
Operating lease liabilities	(45,748)	(7,011)
Amounts due to related parties	8,739	1,339	(11,163)	3,386
Income tax payable	8,457	1,296	4,726	4,618
Net cash used in operating activities	(290,433)	(44,511)	(439,132)	(383,110)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(1,559,946)	(239,074)	(999,538)	(1,094,640)
Disposal of property and equipment	1,363	209
Purchases of intangible assets	(16,865)	(2,585)	(115)	(1,552)
Purchases of short-term investments	(5,607,690)	(859,416)	(1,111,968)	(2,866,795)
Proceeds from maturities of short-term investments	2,891,597	443,157	3,107,623	2,784,428
Purchases of land-use rights	(14,832)	(2,273)
Acquisition of equity investments	(14,650)	(2,245)	(94,376)	(5,000)
Asset-related government grants received	7,020	1,076	5,000	10,000
Loans to senior executives			(23,379)
Net cash (used in) generated from investing activities	(4,314,003)	(661,151)	883,247	(1,173,559)
CASH FLOWS FROM FINANCING ACTIVITIES
Repayment of long-term bank loan	(100,000)	(15,326)	(80,787)	(80,000)
Proceeds from short-term bank loans	278,487	42,680
Proceeds from IPO, net of offering costs	3,933,393	602,819
Proceeds from follow-on offering, net of offering costs	1,876,316	287,558
Repayments of capital lease obligations				(6,551)
Repayment of loan due to a related party			(225,000)	(329,500)
Proceeds from exercise of options	11,227	1,721	20,899
Proceeds from redeemable convertible preferred shares, net of issuance costs	124,730	19,116	349,395	2,851,883
Net cash generated from financing activities	6,124,153	938,568	64,507	2,435,832
Effect of exchange rate changes on cash and cash equivalents	(118,306)	(18,131)	7,570	54,471
Net increase in cash and cash equivalents	1,519,717	232,906	508,622	879,163
Cash and cash equivalents at beginning of year	2,023,263	310,079	1,507,071	573,437
Cash and cash equivalents at end of year	3,424,674	524,854	2,023,263	1,507,071
Supplemental disclosures of cash flow information:
Income taxes paid	6,270	961	4,277	5,013
Interest expense paid	9,206	1,411	24,143	33,544
Cash payments for operating leases	60,273	9,237
Non-cash investing and financing activities:
Purchases of property and equipment included in accrued expenses and other liabilities	181,038	27,745	609,363	132,686
Acquisitions of equity investments included in accrued expenses and other liabilities			15,500
Settlement of senior executive loans by repurchase of ordinary shares	26,700	4,092
Right-of-use assets obtained in exchange for operating lease liabilities	¥ 195,890	$ 30,021
Conversion of warrants into Series D redeemable convertible preferred shares				¥ 42,365
Series D+ redeemable convertible preferred shares issuance costs included in accrued expenses and other liabilities			¥ 10,276

Organization and Basis of Prese

Organization and Basis of Presentation	12 Months Ended
	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	1. ORGANIZATION AND BASIS OF PRESENTATION Kingsoft Cloud Holdings Limited (the “Company”) is a limited liability company incorporated in the Cayman Islands on January 3, 2012. The Company, its subsidiaries, the variable interest entities, and subsidiaries of the variable interest entities are hereinafter collectively referred to as the “Group”. The Group is principally engaged in the provision of cloud services. The Company does not conduct any substantive operations on its own but instead conducts its primary business operations through its subsidiaries, the variable interest entities, and subsidiaries of the variable interest entities, which are located in the People’s Republic of China (the “PRC”), Hong Kong (“HK”) and the United States (the “U.S.”). As disclosed in Note 17, the Company completed its IPO and follow-on As of December 31, 2020, the Company’s principal subsidiaries, variable interest entities, and subsidiaries of the variable interest entities, are as follows: Name Place of establishment Date of establishment/ acquisition Percentage of equity interest attributable to the Company Principal activities Subsidiaries: Kingsoft Cloud Corporation Limited HK February 1, 2012 100 % Cloud services Kingsoft Cloud Inc. U.S. December 22, 2017 100 % Cloud services Wuhan Kingsoft Cloud Information Technology Co., Ltd. PRC December 26, 2017 100 % Cloud services Beijing Kingsoft Cloud Technology Co., Ltd. (“Beijing Kingsoft Cloud”)* PRC April 9, 2012 100 % Research and development Beijing Yunxiang Zhisheng Technology Co., Ltd. (“Yunxiang Zhisheng”)* PRC December 15, 2015 100 % Research and development Variable interest entities: Zhuhai Kingsoft Cloud Technology Co., Ltd. (“Zhuhai Kingsoft Cloud”) PRC November 9, 2012 Nil Investment holding Kingsoft Cloud (Beijing) Information Technology Co., Ltd. (“Kingsoft Cloud Information”) PRC April 13, 2018 Nil Investment holding Variable interest entities’ subsidiaries: Beijing Kingsoft Cloud Network Technology Co., Ltd. (“Beijing Kingsoft Cloud Network Technology”) PRC November 9, 2012 Nil Cloud services Beijing Jinxun Ruibo Network Technology Co., Ltd. (“Beijing Jinxun Ruibo”) PRC December 17, 2015 Nil Cloud services Nanjing Qianyi Shixun Information Technology Co., Ltd. PRC March 31, 2016 Nil Cloud services * collectively, the “WFOE” To comply with PRC laws and regulations which prohibit foreign control of companies that engage in value-added telecommunication services, the Group primarily conducts its business in the PRC through its variable interest entities, Zhuhai Kingsoft Cloud and Kingsoft Cloud Information, and subsidiaries of its variable interest entities (collectively, the “VIEs”). The equity interests of the VIEs are legally held by PRC shareholders (the “Nominee Shareholders”). Despite the lack of technical majority ownership, the Company through WFOE has effective control of the VIEs through a series of contractual arrangements (the “Contractual Agreements”) and a parent-subsidiary relationship exists between the Company and the VIEs. Through the Contractual Agreements, the Nominee Shareholders effectively assigned all of their voting rights underlying their equity interests in the VIEs to the Company and therefore, the Company has the power to direct the activities of the VIEs that most significantly impact its economic performance. The Company also has the ability and obligation to absorb substantially all of the profits and all the expected losses of the VIEs that potentially could be significant to the VIEs. The WFOE was the primary beneficiary of the VIEs through December 2019 and the Company has replaced the WFOE as the primary beneficiary of the VIEs since December 2019. Based on the above, the Company consolidates the VIEs in accordance with SEC Regulation SX-3A-02 Consolidation The following is a summary of the Contractual Agreements: Shareholder Voting Right Trust Agreements Pursuant to the shareholder voting right trust agreements signed amongst Beijing Kingsoft Cloud, Zhuhai Kingsoft Cloud and its Nominee Shareholders, each Nominee Shareholder irrevocably authorizes the person designated by Beijing Kingsoft Cloud to act as his, her or its attorney-in-fact The terms of the shareholder voting right trust agreements signed amongst Yunxiang Zhisheng, Kingsoft Cloud Information and its Nominee Shareholders are the same as the terms described above. Loan Agreements Beijing Kingsoft Cloud has granted interest-free loans with an aggregate amount of RMB279 to one shareholder of Zhuhai Kingsoft Cloud. The loan was solely for the purposes of capital injection of Zhuhai Kingsoft Cloud. The loans are only repayable by the shareholder through a transfer of her equity interests in Zhuhai Kingsoft Cloud to Beijing Kingsoft Cloud or its designated person(s). The terms of the loan agreement signed between Yunxiang Zhisheng and all Nominee Shareholders of Kingsoft Cloud Information are the same as the terms described above, except that the total amount of loans extended to all Nominee Shareholders of Kingsoft Cloud Information is RMB10,000. Exclusive Purchase Option Agreements Pursuant to the exclusive purchase option agreement between Beijing Kingsoft Cloud, Zhuhai Kingsoft Cloud and its Nominee Shareholders, Beijing Kingsoft Cloud has an exclusive irrevocable option to purchase, all or part of the equity interests in Zhuhai Kingsoft Cloud, when and to the extent permitted under PRC law. The purchase price of the equity interests in Zhuhai Kingsoft Cloud shall be equal to the minimum amount of consideration permitted by applicable PRC law or either RMB0.001 or the loan amount, whichever is higher. In addition, the Nominee Shareholders granted Beijing Kingsoft Cloud an exclusive right to designate one or more persons to purchase all or part of the equity interests in Zhuhai Kingsoft Cloud. The exclusive purchase option agreement will terminate when the Nominee Shareholders transfer all of their equity interests in Zhuhai Kingsoft Cloud to Beijing Kingsoft Cloud or its designated person(s). The terms of the exclusive purchase option agreement signed amongst Yunxiang Zhisheng, Kingsoft Cloud Information and its Nominee Shareholders are the same as the terms described above. Exclusive Consultation and Technical Services Agreements Pursuant to the exclusive consultation and technical services agreement between Beijing Kingsoft Cloud and Zhuhai Kingsoft Cloud, Beijing Kingsoft Cloud has the sole and exclusive right to provide Zhuhai Kingsoft Cloud consulting services and technical services. Without the prior written consent of Beijing Kingsoft Cloud, Zhuhai Kingsoft Cloud may not directly or indirectly accept any services subject to the exclusive consultation and technical services agreement from any third party, while Beijing Kingsoft Cloud has the right to designate any party to provide such services. Zhuhai Kingsoft Cloud will pay Beijing Kingsoft Cloud a service fee periodically which is adjustable at the sole discretion of Beijing Kingsoft Cloud. The exclusive consultation and technical services agreement will remain effective for 20 years unless both parties agree to terminate the agreement. The agreement can also be renewed at the discretion of Beijing Kingsoft Cloud. The terms of the exclusive consultation and technical services agreement signed between Yunxiang Zhisheng and Kingsoft Cloud Information are the same as the terms described above, except that the agreement will continuously remain effective unless both parties agree to terminate the agreement. Equity Pledge Agreements Pursuant to the equity pledge agreement amongst Beijing Kingsoft Cloud, Zhuhai Kingsoft Cloud and its Nominee Shareholders, the Nominee Shareholders have pledged all of their equity interests in Zhuhai Kingsoft Cloud to Beijing Kingsoft Cloud to guarantee performance of their obligations under the Contractual Agreements described above. During the term of the equity pledge agreement, Beijing Kingsoft Cloud has the right to receive all of Zhuhai Kingsoft Cloud’s dividends and profits distributed on the pledged equity. In the event of a breach by Zhuhai Kingsoft Cloud or any of its Nominee Shareholders of the contractual obligations under the equity pledge agreement, Beijing Kingsoft Cloud, as pledgee, will have the right to dispose of the pledged equity interests in Zhuhai Kingsoft Cloud and will have priority in receiving the proceeds from such disposal. Zhuhai Kingsoft Cloud and its Nominee Shareholders undertake that, without the prior written consent of Beijing Kingsoft Cloud, they will not transfer, or create or allow any encumbrance on the pledged equity interests. The equity pledge agreements will be in effect permanently until Zhuhai Kingsoft Cloud and its Nominee Shareholders have fulfilled all the obligations under the Contractual Agreements. The terms of the equity pledge agreement signed amongst Yunxiang Zhisheng, Kingsoft Cloud Information and its Nominee Shareholders are the same as the terms described above. In November and December 2019, the Contractual Agreements were supplemented by the following terms: a) Shareholder Voting Right Trust Agreements • The shareholder voting right trust agreements are valid as long as the Nominee Shareholders remain the shareholders of the VIEs. b) Exclusive Purchase Option Agreements • Without the prior consent of the WFOE, the VIEs and the Nominee Shareholders shall not: (i) amend the articles of association, (ii) increase or decrease the registered capital, (iii) sell or otherwise dispose of their assets or beneficial interest, (iv) create or allow any encumbrance on their assets or other beneficial interests, (v) extend any loans to third parties, (vi) enter into any material contracts (except those contracts entered into in the ordinary course of business), (vii) merge with or acquire any other persons or make any investments, or (viii) distribute dividends to their shareholders. • Any proceeds received by the Nominee Shareholders from the exercise of the option, distribution of profits or dividends, shall be remitted to the WFOE or their designated person(s), to the extent permitted under PRC laws. c) Exclusive Consultation and Technical Service Agreements • The exclusive consultation and technical services agreements will remain effective unless terminated by the WFOE at its sole discretion. d) Financial Support Undertaking Letter • Pursuant to the financial support undertaking letter, the Company is obligated and hereby undertakes to provide unlimited financial support to the VIEs, to the extent permissible under the applicable PRC laws and regulations, whether or not any such operational loss is actually incurred. The Company will not request repayment of the loans or borrowings if the VIEs or its Nominee Shareholders do not have sufficient funds or are unable to repay. e) Resolutions of all Shareholders and resolution of the Board of Directors of the Company • The Shareholders and the Company’s Board of Directors resolved that the rights under the Shareholder Voting Right Trust Agreements and the Exclusive Purchase Option Agreements were assigned to the Board of Directors of the Company or any officer authorized by the Board of Directors. As a result, the power and the rights pursuant to the shareholder voting right trust agreements have since been effectively reassigned to the Company which has the power to direct the activities of the VIEs that most significantly impact the VIEs’ economic performance. The Company is also obligated to absorb the expected losses of the VIEs through the financial support as described above. Therefore, the Company has replaced the WFOE as the primary beneficiary of the VIEs since December 2019. As the VIEs were subject to indirect control by the Company through the WFOE immediately before and direct control immediately after the Contractual Agreements were supplemented, the change of the primary beneficiary of the VIEs was accounted for as a common control transaction based on the carrying amount of the net assets transferred. In the opinion of the Company’s legal counsel, (i) the ownership structure relating to the VIEs complies with current PRC laws and regulations; and (ii) the Contractual Agreements with the VIEs and the Nominee Shareholders are valid, binding and enforceable on all parties to these Contractual Agreements and do not violate current PRC laws or regulations; (iii) the resolutions are valid in accordance with the articles of association of the Company and Cayman Islands Law. However, uncertainties in the PRC legal system could cause the relevant regulatory authorities to find the current Contractual Agreements and businesses to be in violation of any existing or future PRC laws or regulations and could limit the Company’s ability to enforce its rights under these contractual arrangements. Furthermore, the Nominee Shareholders of the VIEs may have interests that are different from those of the Company, which could potentially increase the risk that they would seek to act contrary to the terms of the Contractual Agreements with the VIEs. In addition, if the Nominee Shareholders will not remain the shareholders of the VIEs, breach, or cause the VIEs to breach, or refuse to renew the existing Contractual Arrangements the Company has with them and the VIEs, the Company may not be able to effectively control the VIEs and receive economic benefits from them, which may result in deconsolidation of the VIEs. In addition, if the current structure or any of the contractual arrangements were found to be in violation of any existing or future PRC laws or regulations, the Company may be subject to penalties, including but not be limited to, revocation of business and operating licenses, discontinuing or restricting business operations, restricting the Company’s right to collect revenues, temporary or permanent blocking of the Company’s internet platforms, restructuring of the Company’s operations, imposition of additional conditions or requirements with which the Company may not be able to comply, or other regulatory or enforcement actions against the Company that could be harmful to its business. The imposition of any of these or other penalties could have a material adverse effect on the Company’s ability to conduct its business. The following table sets forth the assets, liabilities, results of operations and cash flows of the VIEs included in the Company’s consolidated balance sheets, consolidated statements of comprehensive loss and consolidated statements of cash flows: As at December 31 2019 2020 2020 RMB RMB US$ ASSETS Current assets: Cash and cash equivalents 751,103 1,429,508 219,082 Accounts receivable, net of allowance of RMB22,894 and RMB15,745 (US$2,413) as of December 31, 2019 and 2020, respectively 1,317,110 2,258,313 346,102 Prepayments and other assets 385,402 630,121 96,570 Amounts due from related parties 106,368 204,275 31,306 Amounts due from subsidiaries of the Group 787,900 1,631,592 250,052 Total current assets 3,347,883 6,153,809 943,112 Non-current Property and equipment, net 1,465,338 1,727,620 264,769 Intangible assets, net 6,487 14,980 2,296 Prepayments and other assets 32,624 9,978 1,529 Equity investments 72,000 86,251 13,219 Amounts due from related parties 2,336 4,712 722 Operating lease right-of-use — 210,338 32,236 Total non-current 1,578,785 2,053,879 314,771 Total assets 4,926,668 8,207,688 1,257,883 Current liabilities Accounts payable 1,236,706 2,013,428 308,571 Accrued expenses and other liabilities 780,991 521,307 79,894 Short-term bank loans — 278,488 42,680 Long-term bank loan, current portion 100,000 74,351 11,395 Income tax payable — 45 7 Amounts due to related parties 50,472 56,795 8,704 Current operating lease liabilities — 56,261 8,622 Amounts due to subsidiaries of the Group 1,010,663 903,879 138,526 Total current liabilities 3,178,832 3,904,554 598,399 Non-current Long-term bank loan 74,351 — — Deferred tax liabilities 206 29 4 Other liabilities — 7,020 1,076 Non-current — 146,012 22,377 Amounts due to subsidiaries of the Group 4,244,727 7,367,267 1,129,084 Total non-current 4,319,284 7,520,328 1,152,541 Total liabilities 7,498,116 11,424,882 1,750,940 For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ Revenues 2,218,172 3,882,352 6,377,158 977,342 Net loss (872,291 ) (970,344 ) (922,908 ) (141,442 ) Net cash used in operating activities (451,199 ) (785,378 ) (833,479 ) (127,736 ) Net cash used in investing activities (990,734 ) (836,981 ) (1,471,637 ) (225,538 ) Net cash generated from financing activities 1,838,484 1,618,102 2,802,088 429,439 The revenue-producing assets that are held by the VIEs comprise mainly of electronic equipment, and data center machinery and equipment. The VIEs contributed an aggregate of 100%, 98.1% and 97.0% of the Group’s consolidated revenue for the years ended December 31, 2018, 2019 and 2020, respectively, after elimination of inter-entity transactions. As of December 31, 2020, there was no pledge or collateralization of the VIEs’ assets that can only be used to settle obligations of the VIEs. Other than the amounts due to subsidiaries of the Group (which are eliminated upon consolidation), all remaining liabilities of the VIEs are without recourse to the Company.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of presentation The consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles (“U.S. GAAP”). Principles of consolidation The consolidated financial statements of the Group include the financial statements of the Company, its subsidiaries, and the VIEs for which the Company is the primary beneficiary. All significant intercompany balances and transactions have been eliminated upon consolidation. Use of estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities at the balance sheet dates and the reported amounts of revenue and expenses during the reporting periods. Significant estimates and assumptions reflected in the Group’s consolidated financial statements include, but are not limited to, allowance for doubtful accounts for accounts receivable, measurement of operating right-of-use The Group reviews the estimated useful lives of its property and equipment on an ongoing basis. Due to increasing purchase of high-end Foreign currency The Group’s financial information is presented in Renminbi (“RMB”). The functional currency of the Company and Kingsoft Cloud Inc. is U.S. dollars (“US$”). The functional currency of Kingsoft Cloud Corporation Limited is Hong Kong Dollars (“HK$”). The functional currency of the Company’s subsidiaries and the VIEs located in the PRC is RMB. Transactions denominated in foreign currencies are re-measured re-measured Non-monetary re-measured Convenience translation Amounts in U.S. dollars are presented for the convenience of the reader and are translated at the noon buying rate of RMB6.5250 per US$1.00 on December 31, 2020 in the City of New York for cable transfers of RMB as certified for customs purposes by the Federal Reserve Bank of New York. No representation is made that the RMB amounts could have been, or could be, converted into US$ at such rate. Cash and cash equivalents Cash and cash equivalents consist of cash on hand and time deposits or other highly liquid investments placed with banks or other financial institutions which are unrestricted as to withdrawal or use and have original maturities of less than three months. There are no restricted cash balances for the periods presented. Short-term investments The Group’s short-term investments comprise primarily of cash deposits at fixed rates with original maturities of greater than three months, but less than 12 months. Non-controlling interests A non-controlling interest to non-controlling interests. to non-controlling interests as “non-controlling interests” Equity investments The Group’s equity investments are long-term investments in unlisted companies based in the PRC over which the Group neither has significant influence nor control through investment in common stock or in-substance Investments — Equity Securities Fair Value Measurements and Disclosures The Group makes a qualitative assessment of whether the equity investments are impaired at each reporting date. If a qualitative assessment indicates that the investment is impaired, the entity has to estimate the investment’s fair value in accordance with the principles of ASC 820. If the fair value is less than the investment’s carrying value, the entity has to recognize an impairment loss in the statements of comprehensive loss equal to the difference between the carrying value and fair value. As of December 31, 2019 and 2020, the carrying amount of the Group’s equity investments measured at fair value using the measurement alternative was RMB114,876 and RMB126,583 (US$19,400), respectively, net of accumulated impairment of RMB nil and RMB nil (US$ nil), respectively. The Group recognized RMB nil and RMB14,301 (US$2,192) unrealized gains (upward adjustments), and RMB nil and RMB nil (US$ nil) unrecognized losses (downward adjustments) resulting from observable price changes in orderly transactions for an identical or similar investment of the same issuer in changes in fair value of financial instruments on the consolidated statements of comprehensive loss for years ended December 31, 2019 and 2020, respectively. For all periods presented, no equity securities were sold. Fair value measurements Financial instruments of the Group primarily include cash and cash equivalents, short-term investments, accounts receivable, equity investments, accounts payable, other liabilities, amounts due from and due to related parties, bank loans, convertible preferred shares and redeemable convertible preferred shares. For equity investments, the Group elected to use the measurement alternative to measure those investments at cost, less any impairment, plus or minus changes resulting from observable price changes in orderly transactions for identical or similar investments of the same issuer, if any. The Group, with the assistance of an independent third-party valuation firm, determined the estimated fair value of its equity investments using the alternative measurement. The carrying amount of the bank loans approximates their fair values due to the fact that the related interest rates approximate the interest rates currently offered by financial institutions for similar debt instruments of comparable maturities. The convertible preferred shares and redeemable convertible preferred shares were initially recorded at issue price net of issuance costs. As it relates to the redeemable convertible preferred shares, the Group recognizes changes in the redemption value as they occur and adjusts the carrying value of the redeemable convertible preferred shares to equal the redemption value at the end of each reporting period. The Group applies ASC 820 in measuring fair value. ASC 820 defines fair value, establishes a framework for measuring fair value and requires disclosures to be provided on fair value measurement. The carrying amounts of the remaining financial instruments, approximate their fair values because of their short-term maturities. ASC 820 establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: Level 1—Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. Level 2—Include other inputs that are directly or indirectly observable in the marketplace. Level 3—Unobservable inputs which are supported by little or no market activity. ASC 820 describes three main approaches to measuring the fair value of assets and liabilities: (1) market approach; (2) income approach and (3) cost approach. The market approach uses prices and other relevant information generated from market transactions involving identical or comparable assets or liabilities. The income approach uses valuation techniques to convert future amounts to a single present value amount. The measurement is based on the value indicated by current market expectations about those future amounts. The cost approach is based on the amount that would currently be required to replace an asset. Accounts receivable and allowance for doubtful accounts Accounts receivable are recognized and carried at original invoiced amount less an allowance for any potential uncollectible amounts. An allowance for doubtful accounts is recorded when collection of the full amount is no longer probable. In evaluating the collectability of receivable balances, the Group considers specific evidence including the aging of the receivable, the customer’s payment history, its current credit-worthiness and current economic trends. Accounts receivable are written off after all collection efforts have ceased. Property and equipment, net Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the assets, as follows: Category Estimated Electronic equipment 3–4 years Office equipment and fixtures 5 years Data center machinery and equipment 10 years Repair and maintenance costs are charged to expense as incurred, whereas the cost of renewals and betterments that extend the useful lives of property and equipment are capitalized as additions to the related assets. Retirements, sales and disposals of assets are recorded by removing the cost and accumulated depreciation from the asset and accumulated depreciation accounts with any resulting gain or loss reflected in the consolidated statements of comprehensive loss. Direct costs that are related to the construction of property and equipment, and incurred in connection with bringing the assets to their intended use are capitalized as construction in progress. Construction in progress is transferred to specific property and equipment, and the depreciation of these assets commences when the assets are ready for their intended use. Intangible assets Intangible assets are carried at cost less accumulated amortization and any recorded impairment. Intangible assets with finite useful lives are amortized using a straight-line method of amortization that reflects the estimated pattern in which the economic benefits of the intangible asset are to be consumed. The estimated useful life for the intangible assets is as follows: Category Estimated Domain names 10 years Purchased software and copyrights 3–10 years Others 3 years Impairment of long-lived assets The Group evaluates its long-lived assets for impairment whenever events or changes in circumstances, such as a significant adverse change to market conditions that will impact the future use of the assets, indicate that the carrying amount of an asset may not be fully recoverable. When these events occur, the Group evaluates the recoverability of long-lived assets by comparing the carrying amount of the assets to the future undiscounted cash flows expected to result from the use of the assets and their eventual disposition. If the sum of the expected undiscounted cash flows is less than the carrying amount of the assets, the Group recognizes an impairment loss based on the excess of the carrying amount of the assets over their fair value. Fair value is generally determined by discounting the cash flows expected to be generated by the assets, when the market prices are not readily available. For all periods presented, there was no impairment of any of the Group’s long-lived assets. Segment reporting In accordance with ASC 280-10, Segment Reporting: Overall Revenue recognition In May 2014, the FASB issued Accounting Standard Update (“ASU”) 2014-09, Revenue from Contracts with Customers Effective January 1, 2017, the Group elected to adopt the requirements of ASC 606 using the full retrospective method. The Group applies the five-step model outlined in ASC 606. The Group accounts for a contract when it has approval and commitment from the customer, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. Revenue is allocated to each performance obligation based on its standalone selling price. The Group generally determines standalone selling prices based on observable prices. If the standalone selling price is not observable through past transactions, the Group estimates the standalone selling price based on multiple factors, including, but not limited to, historical discounting trends for services, gross margin objectives, internal costs, and industry technology lifecycles. Timing of revenue recognition may differ from the timing of invoicing to customers. For certain revenue contracts, customers are required to pay before the services are delivered to the customer. The Group recognizes a contract asset or a contract liability in the consolidated balance sheets, depending on the relationship between the entity’s performance and the customer’s payment. Contract liabilities represents the excess of payments received as compared to the consideration earned and is reflected in “accrued expenses and other liabilities” in the Group’s consolidated balance sheets. Contract assets primarily relate to the Group’s rights to consideration for work completed in relation to its services performed but not billed at the reporting date, and is reflected in “prepayments and other assets” in the Group’s consolidated balance sheets. The contract assets are transferred to the receivables when the rights become unconditional. Using the practical expedient in ASC 606, the Group does not adjust the promised amount of consideration for the effects of a significant financing component if it expects, at contract inception, that the period between the transfer of the promised good or service to the customer and when the customer pays for that good or service will be one year or less. Pursuant to ASC 606-10-32-2A, Public cloud services The Group provides integrated cloud-based services including cloud computing, storage and delivery. The nature of the Group’s performance obligation is a single performance obligation to stand ready to provide an unspecified quantify of integrated cloud-based services each day throughout the contract period. The Group uses monthly utilization records, an output measure, to recognize revenue over time as it most faithfully depicts the simultaneous consumption and delivery of services. At the end of each month, the transaction consideration is fixed based on utilization records and no variable consideration exists. Enterprise cloud services The Group provides comprehensive customized cloud-based solutions, which are typically completed within one to six months (“Solutions”). The components within the Solutions are not distinct within the context of the contract because they are considered highly interdependent and the customer can only benefit from these components in conjunction with one another as a two-way , respectively. Others The Group acts an agent to arrange for advertising services to be provided by popular external applications, primarily Xiaomi Corporation (“promotion services”). The Group recognizes revenue on a net basis because the Group is not responsible for fulfilling the promise to provide the specified advertising service, neither does it control the advertising resources nor have inventory risk. The net fee revenue from promotion services is recognized at a point in time when the advertisements are delivered by the external application. The Group discontinued providing all promotion services in early 2019. In 2019 and 2020, others mainly include services ancillary to the Group’s other revenue streams such as IoT solutions. The components within the solutions are not distinct within the context of the contract because they are considered highly interdependent and the customer can only benefit from these components in conjunction with one another as a two-way Cost of revenue Cost of revenues primarily includes bandwidth and internet data center costs, depreciation expense of electronic equipment, data center machinery and equipment, salaries and benefits for employees directly involved in revenue generation activities, and other expenses such as software purchases directly attributable to the provision of services. Research and development Research and development expenses primarily consist of salaries and benefits for research and development personnel, and third party service provider costs. The Group expenses research and development costs as they are incurred. Advertising expenditures Advertising costs are expensed when incurred and are included in sales and marketing expenses in the consolidated statements of comprehensive loss. For the years ended December 31, 2018, 2019 and 2020, the advertising expenses were approximately Government grants Government grants primarily consist of financial grants received from provincial and local governments for operating a business in their jurisdictions and compliance with specific policies promoted by the local governments. There are no defined rules and regulations to govern the criteria necessary for companies to receive such benefits, and the amount of financial subsidy is determined at the discretion of the relevant government authorities. Government grants of non-operating non-operating Leases The Group adopted ASU No. 2016-02, Leases (Topic 842) The Group determines if an arrangement is a lease or contains a lease at lease inception. For operating leases, the Group recognizes a right-of-use asset and a lease liability on the consolidated balance sheets based on the present value of the lease payments over the lease term at commencement date. As most of the Group’s leases do not provide an implicit rate, the Group estimates its incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. The incremental borrowing rate is estimated to approximate the interest rate on a collateralized basis with similar terms and payments, and in economic environments where the leased asset is located. Lease expense is recorded on a straight-line basis over the lease term. Upon adoption, the Group recognized operating lease right-of-use right-of-use non-current Comprehensive loss Comprehensive loss is defined as the changes in equity of the Group during a period from transactions and other events and circumstances excluding transactions resulting from investments by shareholders and distributions to shareholders. Among other disclosures, ASC 220, Comprehensive Income Income taxes The Group follows the liability method of accounting for income taxes in accordance with ASC 740, Income Taxes more-likely-than-not The Group accounted for uncertainties in income taxes in accordance with ASC 740. Interest and penalties arising from underpayment of income taxes shall be computed in accordance with the related PRC tax law. The amount of interest expense is computed by applying the applicable statutory rate of interest to the difference between the tax position recognized and the amount previously taken or expected to be taken in a tax return. Interest and penalties recognized in accordance with ASC 740 are classified in the consolidated statements of comprehensive loss as income tax expense. In accordance with the provisions of ASC 740, the Group recognizes in its consolidated financial statements the impact of a tax position if a tax return position or future tax position is “more likely than not” to prevail based on the facts and technical merits of the position. Tax positions that meet the “more likely than not” recognition threshold are measured at the largest amount of tax benefit that has a greater than fifty percent likelihood of being realized upon settlement. The Group’s estimated liability for unrecognized tax benefits, if any, will be recorded in the “other non-current Share-based compensation Awards granted to employees The Group applies ASC 718, Compensation—Stock Compensation The Group uses the accelerated method for all awards granted with graded vesting based on service conditions. The Group has early adopted ASU 2016-09, Compensation—Stock Compensation , Improvements to Employee Share-Based Payment Accounting Loss per share In accordance with ASC 260, Earnings Per Share two-class two-class two-class Diluted loss per share is calculated by dividing net loss attributable to ordinary shareholders as adjusted for the effect of dilutive ordinary equivalent shares, if any, by the weighted average number of ordinary and dilutive ordinary equivalent shares outstanding during the period. Ordinary equivalent shares consist of the ordinary shares issuable upon the conversion of the Company’s convertible preferred shares and redeemable convertible preferred shares using the if-converted Employee benefit expenses All eligible employees of the Group are entitled to staff welfare benefits including medical care, welfare grants, unemployment insurance and pension benefits through a PRC government-mandated multi-employer defined contribution plan. The Group is required to accrue for these benefits based on certain percentages of the qualified employees’ salaries. The Group is required to make contributions to the plans out of the amounts accrued. The PRC government is responsible for the medical benefits and the pension liability to be paid to these employees and the Group’s obligations are limited to the amounts contributed. The Group has no further payment obligations once the contributions have been paid. The Group recorded employee benefit expenses of RMB114,305, RMB155,848 and RMB126,784 Impact of COVID-19 For the year ended December 31, 2020, COVID-19 COVID-19’s COVID-19 Recent accounting pronouncements The Company is an emerging growth company (“EGC”) as defined by the Jumpstart Our Business Startups Act (“JOBS Act”). The JOBS Act provides that an EGC can take advantage of extended transition periods for complying with new or revised accounting standards. This allows an EGC to delay adoption of certain accounting standards until those standards would otherwise apply to private companies. The Company elected to take advantage of the extended transition periods. However, this election will not apply should the Company cease to be classified as an EGC. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326) Measurement of Credit Losses on Financial Instruments 2016-13”). 2016-13 available-for-sale 2016-13 In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other-Internal-Use 350-40): internal-use 350-40 2018-15 In December 2019, the FASB issued ASU 2019-12 , Simplifying the Accounting for Income Taxes In January 2020, the FASB issued ASU No. 2020-01, Investments—Equity Securities (Topic 321), Investments—Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815) —Clarifying the Interactions between Topic 321, Topic 323, and Topic 815 (a consensus of the FASB Emerging Issues Task Force) 2020-01”), 2020-01 2020-01

Concentration of Risks

Concentration of Risks	12 Months Ended
	Dec. 31, 2020
Concentration of Risk [Abstract]
Concentration of Risks	3. CONCENTRATION OF RISKS Concentration of credit risk Assets that potentially subject the Group to significant concentration of credit risk primarily consist of cash and cash equivalents, short-term investments and accounts receivable. The Group expects that there is no significant credit risk associated with cash and cash equivalents and short-term investments, which were held by reputable financial institutions in the jurisdictions where the Company, its subsidiaries, and the VIEs are located. The Group believes that it is not exposed to unusual risks as these financial institutions have high credit quality. Accounts receivable are typically unsecured and are derived from revenues earned from reputable customers. As of December 31, 2019 and 2020, the Company had two customers, with a receivable balance exceeding 10% of the total accounts receivable balance. The risk with respect to accounts receivable is mitigated by credit evaluations the Group performs on its customers and its ongoing monitoring process of outstanding balances. Business, customer, political, social and economic risks The Group participates in a dynamic and competitive high technology industry and believes that changes in any of the following areas could have a material adverse effect on the Group’s future financial position, results of operations or cash flows: changes in the overall demand for services; competitive pressures due to existing competitors; and new trends in new technologies and industry standards; control of telecommunication infrastructures by local regulators and industry standards; changes in certain strategic relationships or customer relationships; regulatory considerations; and risks associated with the Group’s ability to attract and retain employees necessary to support its growth. The Group’s operations could be adversely affected by significant political, economic and social uncertainties in the PRC. Three customers accounted for 25%, 24% and 11%, respectively, of total revenues during the year ended December 31, 2018, 14%, 31% and 12%, respectively, of total revenues during the year ended December 31, 2019, and 10%, 28% and 15%, respectively, of total revenues during the year ended December 31, 2020. Currency convertibility risk The Group transacts a majority of its business in RMB, which is not freely convertible into foreign currencies. On January 1, 1994, the PRC government abolished the dual rate system and introduced a single rate of exchange as quoted daily by the People’s Bank of China (“PBOC”). However, the unification of the exchange rates does not imply that the RMB may be readily convertible into United States dollars or other foreign currencies. All foreign exchange transactions continue to take place either through the PBOC or other banks authorized to buy and sell foreign currencies at the exchange rates quoted by the PBOC. Approval of foreign currency payments by the PBOC or other institutions requires submitting a payment application form together with suppliers’ invoices, shipping documents and signed contracts. Additionally, the value of the RMB is subject to changes in central government policies and international economic and political developments affecting supply and demand in the PRC foreign exchange trading system market. Foreign currency exchange rate risk From July 21, 2005, the RMB is permitted to fluctuate within a narrow and managed band against a basket of certain foreign currencies. For RMB against U.S. dollar, there was depreciation of approximately 1.3% and appreciation of approximately 6.3% during the years ended December 31, 2019 and 2020, respectively. It is difficult to predict how market forces or PRC or U.S. government policy may impact the exchange rate between the RMB and the U.S. dollar in the future. To the extent that the Group needs to convert U.S. dollar into RMB for capital expenditures and working capital and other business purposes, appreciation of RMB against U.S. dollar would have an adverse effect on the RMB amount the Group would receive from the conversion. Conversely, if the Group decides to convert RMB into U.S. dollar for the purpose of making payments for dividends on ordinary shares, strategic acquisitions or investments or other business purposes, appreciation of U.S. dollar against RMB would have a negative effect on the U.S. dollar amount available to the Group. In addition, a significant depreciation of the RMB against the U.S. dollar may significantly reduce the U.S. dollar equivalent of the Group’s earnings or losses.

Revenues

Revenues	12 Months Ended
	Dec. 31, 2020
Revenue Recognition and Deferred Revenue [Abstract]
Revenues	4. REVENUES The following table presents the Group’s revenues from contracts with customers disaggregated by material revenue category: For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ Public cloud services recognized over time 2,110,513 3,458,843 5,166,851 791,855 Enterprise cloud services: Solutions recognized at a point in time 94,369 485,991 1,368,544 209,739 Maintenance recognized over time — 317 4,145 635 94,369 486,308 1,372,689 210,374 Others: Others recognized at a point in time 13,290 11,202 36,611 5,611 Others recognized over time — — 1,156 177 13,290 11,202 37,767 5,788 2,218,172 3,956,353 6,577,307 1,008,017 The transaction prices allocated to the remaining performance obligations (unsatisfied or partially unsatisfied) as at December 31, 2020 are related to enterprise cloud services and others, which are as follows: RMB US$ Within one year 8,582 1,315 More than one year 4,576 701 Total 13,158 2,016 Contract Balances Contract liabilities relate to contracts where the Group received payments but has not yet satisfied the related performance obligations. The advance consideration received from customers for the services is a contract liability until services are provided to the customer. For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ Revenue recognized from amounts included in contract liabilities at the beginning of the period 19,312 22,782 37,550 5,755

Accounts Receivable, Net

Accounts Receivable, Net	12 Months Ended
	Dec. 31, 2020
Receivables, Net, Current [Abstract]
Accounts Receivable, Net	5. ACCOUNTS RECEIVABLE, NET As at December 31 2019 2020 2020 RMB RMB US$ Accounts receivable 1,370,375 2,350,641 360,252 Allowance for doubtful accounts (22,894 ) (15,770 ) (2,417 ) Accounts receivable, net 1,347,481 2,334,871 357,835 The movements in the allowance for doubtful accounts were as follows: As at December 31 2018 2019 2020 2020 RMB RMB RMB US$ Balance at beginning of the year 2,183 2,249 22,894 3,509 Additions (reversals) 66 20,645 (7,124 ) (1,092 ) Balance at end of the year 2,249 22,894 15,770 2,417

Prepayments and Other Assets

Prepayments and Other Assets	12 Months Ended
	Dec. 31, 2020
Prepayments and Other Assets [Abstract]
Prepayments and Other Assets	6. PREPAYMENTS AND OTHER ASSETS As at December 31 2019 2020 2020 RMB RMB US$ Current portion: Prepayments to suppliers 15,903 78,621 12,049 Contract costs 12,979 13,882 2,128 VAT prepayments 360,401 470,567 72,118 Interest receivable 3,114 14,204 2,177 Deferred IPO costs 11,971 — — Individual income tax receivable* (Note 10) — 231,377 35,460 Others 17,570 78,435 12,020 421,938 887,086 135,952 Non-current Prepayments for electronic equipment 33,970 8,978 1,376 Others 2,498 2,846 436 36,468 11,824 1,812 * Represents amounts due from certain employees related to their individual income taxes (“IIT”) arising from exercise and vesting of share-based awards.

Property and Equipment, Net

Property and Equipment, Net	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Property and Equipment, Net	7. PROPERTY AND EQUIPMENT, NET As at December 31 2019 2020 2020 RMB RMB US$ Electronic equipment 3,233,327 4,164,384 638,219 Office equipment and fixtures 1,444 9,759 1,496 Data center machinery and equipment 131,037 135,068 20,700 Construction in progress 849 5,454 836 3,366,657 4,314,665 661,251 Less: accumulated depreciation (1,645,683 ) (2,357,875 ) (361,360 ) Property and equipment, net 1,720,974 1,956,790 299,891 Depreciation expense for the years ended December 31, 2018, 2019 and 2020 was RMB409,415, RMB601,730 and RMB750,375 (US$ 115,000), respectively.

Intangible Assets, Net

Intangible Assets, Net	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets, Net	8. INTANGIBLE ASSETS, NET As at December 31 2019 2020 2020 RMB RMB US$ Domain names 7,041 7,020 1,076 Purchased software and copyrights 6,564 20,807 3,189 Others 4,598 7,469 1,145 18,203 35,296 5,410 Less: accumulated amortization Domain names (2,309 ) (3,035 ) (465 ) Purchased software and copyrights (5,128 ) (10,268 ) (1,574 ) Others (3,338 ) (5,420 ) (831 ) (10,775 ) (18,723 ) (2,870 ) Intangible assets, net 7,428 16,573 2,540 Amortization expense of intangible assets for the years ended December 31, 2018, 2019 and 2020 was RMB 2,937 2,851 7,663 1,174 RMB US$ 2021 10,421 1,597 2022 2,322 356 2023 1,350 207 2024 883 135 2025 and thereafter 1,597 245 Total 16,573 2,540

Leases

Leases	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Leases	9. LEASES The Group’s operating leases mainly related to office space and buildings. For leases with terms greater than 12 months, the Group records the related assets and lease liabilities at the present value of lease payments over the lease term. Certain leases include rental-free periods and rental escalation clause, which are factored into the Group’s determination of lease payments when appropriate. As of December 31, 2020, the Group had no finance leases. As of December 31, 2020, the weighted average remaining lease term was 9.7 years and weighted average discount rate was 6.36% for the Group’s operating leases. For the year ended December 31, 2020, operating lease cost recognized in profit or loss was RMB52,890 (US$8,106), which excluded cost of short-term contracts. Short-term lease cost for the year ended December 31, 2020 was RMB3,036 (US$465). The undiscounted future minimum payments under the Group’s operating lease liabilities and reconciliation to the operating lease liabilities recognized on the consolidated balance sheet was as below: RMB US$ 2021 79,495 12,183 2022 51,151 7,839 2023 48,582 7,446 2024 49,123 7,528 2025 and thereafter 101,412 15,542 Total future lease payments 329,763 50,538 Less: imputed interest (70,336 ) (10,779 ) Total lease liability balance 259,427 39,759

Accrued Expenses and Other Liab

Accrued Expenses and Other Liabilities	12 Months Ended
	Dec. 31, 2020
Payables and Accruals [Abstract]
Accrued Expenses and Other Liabilities	10. ACCRUED EXPENSES AND OTHER LIABILITIES As at December 31 2019 2020 2020 RMB RMB US$ Current portion: Customer advances* 79,608 191,357 29,327 Salary and welfare payable 136,762 117,506 18,009 Purchase of property and equipment 609,363 181,038 27,745 Acquisition of equity investments 15,500 — — Accrued expenses 67,027 44,559 6,829 Other tax and surcharges payable 10,608 25,227 3,866 Deferred government grants 7,919 10,321 1,582 Individual income tax payable** (Note 6) — 231,377 35,460 Others*** 22,426 43,989 6,741 949,213 845,374 129,559 Non-current Deferred government grants — 7,020 1,076 Others*** — 33,558 5,143 — 40,578 6,219 * The amount represents contract liabilities for rendering of services. The increase in customer advances as compared to the year ended December 31, 2019 is a result of the increase in consideration received from the Group’s customers. ** Represents IIT payable to the tax bureau on behalf of certain employees related to their exercise and vesting of share-based awards. *** In July 2020, the Company received a reimbursement of (equivalent to from the depository for the establishment and maintenance of the ADS program (“ADS Reimbursement”). As of December 31, 2020, were included in the current portion and non-current portion of accrued expenses and other liabilities, respectively. The ADS Reimbursement will be released to the consolidated statements of comprehensive loss in equal amounts over the ADS program term.

Bank Loans

Bank Loans	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Bank Loans	11. BANK LOANS As at December 31 2019 2020 2020 RMB RMB US$ Short-term bank loans — 278,488 42,680 Long-term third-party bank loan guaranteed by a related party (Note 18): Current portion 100,000 74,351 11,395 Non-current 74,351 — — 174,351 352,839 54,075 In June 2016, the Group entered into a long-term loan facility for an aggregate principal amount of RMB400,000 with a bank in Beijing bearing a fixed annual interest rate of 90% of the benchmark five-year lending rate published by the PBOC. The facility expires on June 1, 2021, of which RMB335,137 (US$51,362) was utilized. As of December 31, 2020, the long-term loan of RMB74,351 (US$11,395) will be repaid within twelve months and is classified as “Long-term bank loan, current portion”. The interest rate for the outstanding loan with a bank in Beijing as of December 31, 2019 and 2020, was approximately 4.3% and 4.3%, respectively. In June and August 2020, the Group entered into three short-term bank loans with three banks in Beijing bearing fixed annual interest rates of 4.35%, 2.85% and 4.90%, respectively. The weighted average interest rate for the outstanding short-term bank loans as of December 31, 2020 was 4.28%. There are no commitment fees and conditions under which lines may be withdrawn associated with the Group’s unused facilities.

Taxation

Taxation	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Taxation	12. TAXATION Enterprise income tax Cayman Islands Under the current laws of the Cayman Islands, the Company is not subject to tax on income or capital gains. Hong Kong The subsidiaries incorporated in Hong Kong are subject to income tax at the rate of 16.5% on the estimated assessable profits arising in Hong Kong. For the periods presented, the Group did not make any provisions for Hong Kong profit tax as the group did not generate any assessable profits arising in Hong Kong at the end of each reporting period. Under the Hong Kong tax law, the subsidiaries in Hong Kong are exempted from income tax on its foreign-derived income and there are no withholding taxes in Hong Kong on remittance of dividends. China The Group’s PRC entities are subject to the statutory income tax rate of 25%, in accordance with the Enterprise Income Tax law (the “EIT Law”), which was effective since January 1, 2008. Beijing Kingsoft Cloud and Beijing Kingsoft Cloud Network Technology being qualified as a High New Technology Enterprise (‘‘HNTE’’) is entitled to the preferential income tax rate of 15% for three years from 2019 to 2021. In addition, Beijing Jinxun Ruibo being qualified as a HNTE is entitled to the preferential income tax rate of 15% for three years from 2020 to 2022. Dividends, interests, rent or royalties payable by the Group’s PRC entities to non-PRC non-resident non-PRC Loss before income taxes consists of: For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ PRC (1,055,676 ) (1,167,367 ) (1,095,015 ) (167,817 ) Non-PRC 58,866 65,171 147,721 22,639 (996,810 ) (1,102,196 ) (947,294 ) (145,178 ) The current and deferred components of income tax expense appearing in the consolidated statements of comprehensive loss are as follows: For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ Current income tax expense 9,809 9,180 15,081 2,311 Deferred income tax benefit (177 ) (177 ) (177 ) (27 ) 9,632 9,003 14,904 2,284 The reconciliation of income tax expense computed using the PRC statutory tax rate to the actual income tax expense is as follows: For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ Loss before income tax (996,810 ) (1,102,196 ) (947,294 ) (145,178 ) Income tax computed at the PRC statutory tax rate of 25% (249,203 ) (275,549 ) (236,824 ) (36,295 ) Effect of tax holiday and preferential tax rates (29,103 ) 11,493 (44,121 ) (6,762 ) Effect of different tax rates in different jurisdictions (20,980 ) (11,626 ) 10,580 1,621 Other non-taxable (4,018 ) (21,557 ) (35,454 ) (5,434 ) Non-deductible 20,931 64,095 14,060 2,156 Share based compensation costs 11,794 30,320 82,528 12,648 Research and development super deduction (75,787 ) (94,401 ) (113,388 ) (17,377 ) Withholding tax and others 9,809 9,180 11,581 1,775 Change in valuation allowance 369,257 259,031 399,756 61,265 True-up — — (83,342 ) (12,773 ) Tax rate change on deferred items (23,068 ) 38,017 9,528 1,460 Income tax expense 9,632 9,003 14,904 2,284 Deferred tax The significant components of the Group’s deferred tax assets and liabilities are as follows: As at December 31 2019 2020 2020 RMB RMB US$ Deferred tax assets: Tax loss carry forward 921,045 1,454,702 222,943 Accrued expenses 71,720 56,111 8,599 Depreciation 2,775 4,990 765 Allowance for doubtful accounts 2,925 3,156 484 Government grant 2,268 6,175 946 Operating lease liabilities — 56,706 8,691 Accrued interest — 66,609 10,208 Others 1,104 — — Less: valuation allowance (1,001,837 ) (1,401,416 ) (214,776 ) — 247,033 37,860 Deferred tax liabilities: Operating lease right-of-use — 54,658 8,377 One-time — 191,107 29,288 Long-lived assets arising from acquisition 206 29 4 Others — 1,268 195 206 247,062 37,864 The Group operates through several subsidiaries, VIEs and subsidiaries of VIEs and the valuation allowance is considered for each subsidiary, VIE and subsidiary of VIE on an individual basis. As of December 31, 2019 and 2020, the Group’s total deferred tax assets before valuation allowances were RMB1,001,837 and RMB1,648,449 (US$252,636), respectively. As of December 31, 2019 and 2020, the Group recorded valuation allowances of RMB1,001,837 and RMB1,401,416 (US$214,776), respectively, on its deferred tax assets that are sufficient to reduce the deferred tax assets to the amounts that are more-likely-than-not to As of December 31, 2020, the Group had net losses of approximately RMB5,961,070 (US$913,574) mainly deriving from entities in the PRC and Hong Kong. The tax losses in PRC can be carried forward for five years to offset future taxable profit and the period was extended to ten years for entities that qualify as HNTE. The tax losses of entities in the PRC will expire between 2021 to 2025 and the tax losses of entities in the PRC that qualify as HNTE will expire between 2021 to 2030, if not utilized. The tax losses in Hong Kong can be carried forward without an expiration date. Unrecognized tax benefits As of December 31, 2019 and 2020, the Group had unrecognized tax benefits of tax-deduction As at December 31 2020 2020 RMB US$ Balance at beginning of the year — — Additions based on tax positions related to current year 12,613 1,933 Balance at end of the year 12,613 1,933 For the periods presented, the Group did not record any interest and penalties related to an uncertain tax position. In general, the tax authorities have three to five years to conduct examinations of the tax filings of the Group’s subsidiaries. Accordingly, the subsidiaries’ tax years of 2017 through 2020 remain open to examination by the respective tax authorities.

Convertible Preferred Shares an

Convertible Preferred Shares and Redeemable Convertible Preferred Shares	12 Months Ended
	Dec. 31, 2020
Convertible Preferred Stock And Redeemable Convertible Preferred Stock [Abstract]
Convertible Preferred Shares and Redeemable Convertible Preferred Shares	13. CONVERTIBLE PREFERRED SHARES AND REDEEMABLE CONVERTIBLE PREFERRED SHARES As of January 1, 2019, several investors held in aggregate 458,116,000 of Series A convertible preferred shares (“Series A Preferred Shares”), representing all of the Company’s issued and outstanding Series A Preferred Shares prior to the IPO. The Series A Preferred Shares were issued on various dates in 2013 and 2015 at US$0.07 per share for a total cash consideration of US$ 34,000. As of January 1, 2019, several investors held in aggregate 153,603,600 of Series B convertible preferred shares (“Series B Preferred Shares”), representing all of the Company’s issued and outstanding Series B Preferred Shares prior to the IPO. The Series B Preferred Shares were issued on various dates in 2015 at US$0.36 per share for a total cash consideration of US$54,988. As of January 1, 2019, several investors held in aggregate 185,665,192 of Series C redeemable convertible preferred shares (“Series C Preferred Shares”), representing all of the Company’s issued and outstanding Series C Preferred Shares prior to the IPO. The Series C Preferred Shares were issued on various dates in 2016 at US$0.59 per share for a total cash consideration of US$108,903. As of January 1, 2019, several investors held in aggregate 842,738,782 of redeemable convertible preferred shares (“Series D Preferred Shares”), representing all of the Company’s issued and outstanding Series D Preferred Shares prior to the IPO. The Series D Preferred Shares were issued on various dates in 2017 and 2018 at US$0.85 or US$0.88 per share for a total cash consideration of US$721,000. On December 27, 2019, the Company entered into an agreement to issue in aggregate 77,125,997 Series D+ redeemable convertible preferred shares (the “Series D+ Preferred Shares”) to investors at US$0.91 per share. On December 30, 2019, the Company received cash consideration of US$50,000 in exchange for issuing 55,089,998 Series D+ Preferred Shares. On January 8, 2020, the Company received cash consideration of US$20,000 in exchange for issuing the remaining 22,035,999 Series D+ Preferred Shares. The key features of the Series A Preferred Shares, Series B Preferred Shares, Series C Preferred Shares, Series D Preferred Shares and Series D+ Preferred Shares (collectively, the “Preferred Shares”) are summarized as follows: Dividends Each holder of the Series D+ Preferred Shares is entitled to receive on a pari passu basis, when, if and as declared at the sole discretion of the Board of Directors, prior and in preference to Series D, Series C, Series B, Series A preferred shareholders and ordinary shareholders. Each holder of the Series D Preferred Shares is entitled to receive on a pari passu basis, when, if and as declared at the sole discretion of the Board of Directors, prior and in preference to Series C, Series B, Series A preferred shareholders and ordinary shareholders. Each holder of the Series C Preferred Shares is entitled to receive on a pari passu basis, when, if and as declared at the sole discretion of the Board of Directors, prior and in preference to Series B, Series A preferred shareholders and ordinary shareholders. Each holder of the Series B Preferred Shares is entitled to receive on a pari passu basis, when, if and as declared at the sole discretion of the Board of Directors, prior and in preference to Series A preferred shareholders and ordinary shareholders. Each holder of the Series A Preferred Shares is entitled to receive on a pari passu basis, when, if and as declared at the sole discretion of the Board of Directors, prior and in preference to ordinary shareholders. After payment of the dividends to the Series D+, Series D, Series C, Series B and Series A preferred shareholders (collectively, referred to as the “Preferred Shareholders” or “Preferred Shareholder”), each ordinary shareholder shall be entitled to receive dividends payable in cash, whenever funds are legally available, on a pari passu basis, if and as declared by the Board of Directors. Dividends declared by the Board of Directors but unpaid shall accrue and be payable when and as such cash becomes available. Dividends are non-cumulative. No Voting Rights Each Preferred Shareholder is entitled to the number of votes equal to the number of ordinary shares into which such holder’s Preferred Shares could be converted. Preferred Shareholders shall vote together with ordinary shareholders, with respect to any matter upon which ordinary shareholders have the right to vote. Liquidation Preference In the event of liquidation, dissolution or winding up of the Company, either voluntary or involuntary, or any deemed liquidation event as defined in the Company’s articles of association (the “Liquidation Transaction”), the assets of the Company available for distribution shall be made as follows: Each holder of the Series D+ Preferred Shares shall be entitled to receive, on a pari passu basis, an amount equal to the sum of 120% of the issue price of the Series D+ Preferred Shares for each outstanding Series D+ Preferred Shares, plus all declared but unpaid dividends. If the assets and funds thus distributed among the holders of the Series D+ Preferred Shares shall be insufficient to permit the payment to such holders of the full aforesaid preferential amounts, then the entire assets and funds of the Company legally available for distribution to shareholders shall be distributed ratably among the holders of the Series D+ Preferred Shares in proportion to the full preferential amount each such holder is otherwise entitled to receive. Upon completion of the distributions of the full amount made to each holder of the Series D+ Preferred Shares in accordance with the above, the remaining assets of Company available for distribution to each holder of the Series D Preferred Shares, on a pari passu basis, an amount equal to the sum of 120% of the issue price of the Series D Preferred Shares for each outstanding Series D Preferred Shares, plus all declared but unpaid dividends. If the assets and funds thus distributed among the holders of the Series D Preferred Shares shall be insufficient to permit the payment to such holders of the full aforesaid preferential amounts, then the entire assets and funds of the Company legally available for distribution to shareholders shall be distributed ratably among the holders of the Series D Preferred Shares in proportion to the full preferential amount each such holder is otherwise entitled to receive. Upon completion of the distributions of the full amount made to each holder of the Series D and Series D+ Preferred Shares in accordance with the above, the remaining assets of Company available for distribution to each holder of the Series C Preferred Shares, on a pari passu basis, with an amount equal to the sum of 120% of the issue price of the Series C Preferred Shares for each outstanding Series C Preferred Shares, plus all declared but unpaid dividends. If the assets and funds thus distributed among the holders of the Series C Preferred Shares shall be insufficient to permit the payment to such holders of the full aforesaid preferential amounts, then the entire assets and funds of the Company legally available for distribution to shareholders shall be distributed ratably among the holders of the Series C Preferred Shares in proportion to the full preferential amount each such holder is otherwise entitled to receive. Upon completion of the distributions of the full amount made to each holder of the Series C, Series D and Series D+ Preferred Shares in accordance with the above, the remaining assets of Company available for distribution to each holder of the Series B Preferred Shares, on a pari passu basis, with an amount equal to the sum of 120% of the issue price of the Series B Preferred Shares for each outstanding Series B Preferred Shares, plus all declared but unpaid dividends. If the assets and funds thus distributed among the holders of the Series B Preferred Shares shall be insufficient to permit the payment to such holders of the full aforesaid preferential amounts, then the entire assets and funds of the Company legally available for distribution to shareholders shall be distributed ratably among the holders of the Series B Preferred Shares in proportion to the full preferential amount each such holder is otherwise entitled to receive. After payment has been made to the Series B, Series C, Series D and Series D+ Preferred Shareholders in accordance with the above, all of the remaining assets of the Company available for distribution to shareholders shall be ratably distributed among the Series A Preferred Shareholders and holders of ordinary shares on a pari passu basis. Conversion rights Each holder of the Preferred Shares has the right, at each holder’s sole discretion, to convert at any time and from time to time, all or any portion of the Preferred Shares into ordinary shares. The initial conversion price is the stated issuance price for each series of Preferred Shares. The initial conversion ratio for each series of Preferred Shares is on a one for one basis and subject to adjustments in the event of share splits, reverse share splits, share dividends and distribution, or any capital reorganization or reclassification of the ordinary shares. The initial conversion ratio for the Series C, Series D and Series D+ Preferred Shares is also subject to adjustment in the event that the Company issues additional ordinary shares for a consideration per share less than the original respective conversion price, as the case may be, in effect on the date of and immediately prior to such issue. In such event, the respective conversion price is reduced, concurrently with such issue, to a price as adjusted according to an agreed-upon formula in the Company’s articles of association. The Preferred Shares are automatically converted into ordinary shares immediately upon the closing of an IPO and the conversion ratio was one preferred share convertible into one ordinary share. Redemption The Series B Preferred Shares are subject to redemption by the Company at the option of the investor, Celestial Power Limited (“Celestial”) in the event a public offering in which the pre-IPO market The Series C Preferred Shares are subject to redemption by the Company at the option of the holders if the Company fails to complete an IPO on May 16, 2021. The redemption price shall be equal to original issuance price and a return at the compound rate of 8% per annum calculated from the date of the actual issuance of such Series C Preferred Shares to the date on which such preferred share is redeemed. The Series D and Series D+ Preferred Shares are subject to redemption by the Company at the option of the holders if the Company fails to complete a public offering in which the pre-IPO market Registration rights All the Preferred Shareholders have the following registration rights: (a) Demand Registration Rights At any time after the earlier of (i) December 27, 2023, or (ii) the first anniversary of the consummation of an IPO, holders holding in the aggregate not less than 30% of the registrable securities then outstanding may make a written request to the Company to register, and the Company shall use its best efforts to register, under the Securities Act the number of registrable securities specified in such requests, provided, however, that (i) the Company shall not be obligated to effect more than two such demand registrations and (ii) the Company shall not be obligated to effect a demand registration if the initiating holders propose to sell their registrable securities in an amount less than 30% of the registrable securities then outstanding. (b) Piggyback Registration Rights If the Company proposes to register any ordinary shares in connection with an offering by the Company for its own account (other than a registration utilizing Form F-4 F-8 (c) F-3 At any time following the consummation of an IPO, after the Company becomes eligible to use Form F-3 F-3 F-3; F-3 The Company is required to use its best efforts to affect the registration if requested by the Preferred Shareholders, but the provisions of the registration rights do not stipulate the consequences of non-performance non-monetary non-performance. Accounting for Preferred Shares The Series A Preferred Shares are classified as permanent equity because they are not redeemable and the holders of the Series A Preferred Shares are entitled to receive the same form of consideration upon a Liquidation Transaction as holders of equally and more subordinated equity instruments, specifically, the ordinary shareholders. The Series B Preferred Shares are classified as mezzanine equity as they may be redeemed upon the occurrence of conditional events such as a Liquidation Transaction and Kingsoft Corporation Limited’s voluntary refusal to approve the Series B Qualified IPO proposal. The Series C, Series D and Series D+ Preferred Shares are classified as mezzanine equity as they may be redeemed at the option of the holders on or after an agreed upon date outside the sole control of the Company. The Preferred Shareholders have the ability to convert the instrument into the Company’s ordinary shares. The Company uses the whole instrument approach to determine whether the nature of the host contract in a hybrid instrument is more akin to debt or to equity. The Company evaluated the embedded conversion option in the Preferred Shares to determine if there were any embedded derivatives requiring bifurcation and to determine if there were any beneficial conversion features (“BCF”). The conversion option of the Preferred Shares does not qualify for bifurcation accounting because the conversion option is clearly and closely related to the host instrument and the underlying ordinary shares are not publicly traded nor readily convertible into cash. The contingent redemption options and registration rights of all the Preferred Shares do not qualify for bifurcation accounting because the underlying ordinary shares are not publicly traded nor readily convertible into cash. There are no other embedded derivatives that are required to be bifurcated. BCF exists when the conversion price of the preferred shares is lower than the fair value of the ordinary shares at the commitment date, which is the issuance date of the respective series of Preferred Shares in the Company’s case. When a BCF exists as of the commitment date, its intrinsic value is bifurcated from the carrying value of the Preferred Shares as a contribution to additional paid-in 470-20-35-1, The Company concluded that the Series B Preferred Shares are not redeemable currently, and is not probable that the Series B Preferred Shares will become redeemable because the likelihood of Liquidation Transaction is remote. Therefore, no adjustment will be made to the initial carrying amount of the Series B Preferred Shares until it is probable that they will become redeemable. The Company concluded that the Series C, Series D and Series D+ Preferred Shares are not redeemable currently, but it is probable that the Series C, Series D and Series D+ Preferred Shares will become redeemable. The Company chose to recognize changes in the redemption value as they occur and adjusted the carrying amount of the Series C, Series D and Series D+ Preferred Shares to equal the redemption value at the end of each reporting period. The Company chose to recognize changes in the redemption value as they occur and adjusted the carrying amount of the Series C, Series D and Series D+ Preferred Shares to equal the redemption value at the end of each reporting period. Upon completion of the Company’s IPO on May 8, 2020, all the Preferred Shares were converted on a one-for-one basis into ordinary shares (Note 17).

Share-based Payments

Share-based Payments	12 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Share-based Payments	14. SHARE-BASED PAYMENTS The Company has two share-based compensation plans under which awards may be granted to employees, namely, the Share Option Scheme and the Share Award Scheme. The maximum aggregate number of ordinary shares that are authorized to be issued under the Share Option Scheme and Share Award Scheme is 209,750,000 and 215,376,304, respectively. Both plans have a contractual term of ten years. The share-based awards are accounted for as equity awards and generally vest over a period from two to five years. Share Option Scheme A summary of the activity under the Share Option Scheme is stated below: Number of options Weighted- average exercise price Weighted- average grant-date fair value Weighted- average remaining contractual term Aggregate intrinsic value US$ US$ Years US$ Outstanding, December 31, 2019 129,852,000 0.07 0.37 7.32 Granted 12,387,915 0.07 Forfeited (5,696,000 ) 0.07 Expired (788,000 ) 0.07 Exercised (48,996,540 ) 0.07 Outstanding, December 31, 2020 86,759,375 0.07 0.54 7.12 2.83 Vested and expected to vest at December 31, 2020 86,759,375 0.07 0.54 7.12 2.83 Exercisable at December 31, 2020 36,603,460 0.07 0.27 5.64 2.83 The aggregate intrinsic value in the table above represents the difference between the fair value of the Company’s ordinary share as of December 31, 2020 and the option’s respective exercise price. Total intrinsic value of options exercised for the years ended December 31, 2018, 2019 and 2020 were RMB nil, RMB308,665 and RMB906,120 (US$138,869). The total weighted average grant-date fair value of the share-based awards granted during the years ended December 31, 2018, 2019 and 2020 were US$0.58, US$0.65 and US$1.16 per option, respectively. The aggregate fair value of the share-based awards vested during the years ended December 31, 2018, 2019 and 2020 were RMB43,115, RMB36,060 and RMB44,135 (US$ 6,764), respectively. As of December 31, 2020, there was RMB127,048 (US$19,471) of total unrecognized employee share-based compensation expenses, related to unvested share-based awards, which are expected to be recognized over a weighted-average period of 1.54 years. Total unrecognized compensation cost may be adjusted for actual forfeitures occurring in the future. Share Award Scheme A summary of the activity for the restricted shares issued under the Share Award Scheme is stated below: Number of shares Weighted-average grant date fair value US$ Outstanding, December 31, 2019 53,296,176 0.70 Granted 25,300,000 0.78 Vested (21,470,416 ) 0.65 Forfeited (3,523,200 ) 0.76 Outstanding, December 31, 2020 53,602,560 0.76 Expected to vest at December 31, 2020 53,602,560 0.76 No restricted share was granted during the year ended December 31, 2018. The total weighted average grant-date fair value of the share-based awards granted during the years ended December 31, 2019 and 2020 were US$0.74 and US$0.78 per share, respectively. The aggregate fair value of the share-based awards vested during the years ended December 31, 2019 and 2020 were RMB19,580 and RMB91,683 (US$14,051), respectively. As of December 31, 2020, there was RMB132,797 (US$20,352) of total unrecognized share-based compensation expenses related to unvested share-based awards which are expected to be recognized over a weighted-average period of 1.67 years. The fair value of the restricted shares is the fair value of the Company’s ordinary shares at their respective grant dates, which was determined with the assistance of an independent third party valuer prior to the completion of the IPO and based on the price of the Company’s publicly traded shares after completion of the IPO. Total unrecognized compensation cost may be adjusted for actual forfeitures occurring in the future. A summary of the activity for the options issued under the Share Award Scheme is stated below: Number of options Weighted- average exercise price Weighted- average grant- fair value Weighted- average remaining contractual term Aggregate intrinsic value US$ US$ Years US$ Outstanding, December 31, 2019 19,556,800 0.87 0.30 9.93 Granted 19,200,000 0.77 Forfeited (1,148,800 ) 0.87 Exercised (416,160 ) 0.87 Outstanding, December 31, 2020 37,191,840 0.82 0.31 9.00 2.09 Vested and expected to vest at December 31, 2020 37,191,840 0.82 0.31 9.00 2.09 Exercisable at December 31, 2020 7,376,800 0.76 0.30 9.05 2.15 The aggregate intrinsic value in the table above represents the difference between the fair value of the Company’s ordinary share as of December 31, 2020 and the option’s respective exercise price. No option was granted, exercised and outstanding during the year ended December 31, 2018 and no option was exercised during the year ended December 31, 2019. Total intrinsic value of options exercised for the year ended December 31, The total weighted average grant-date fair value of the share-based awards granted during the years ended December 31, 2019 and 2020 were US$0.30 and US$0.31 per option, respectively. The aggregate fair value of the share-based awards vested during the years ended December 31, 2019 and 2020 were RMB nil and RMB15,981 (US$2,449), respectively. As of December 31, 2020, there was RMB32,416 (US$4,968) of total unrecognized employee share-based compensation expenses, related to unvested share-based awards, which are expected to be recognized over a weighted-average period of 1.78 years. Total unrecognized compensation cost may be adjusted for actual forfeitures occurring in the future. Fair value of share options The fair value of share options was determined using the binomial tree model, with the assistance from an independent third-party appraiser. The binomial model requires the input of highly subjective assumptions, including the expected share price volatility and the exercise multiple. For expected volatility, the Company has made reference to historical volatility of several comparable companies. The exercise multiple was estimated as the average ratio of the stock price to the exercise price of when employees would decide to voluntarily exercise their vested options. As the Company did not have sufficient information of past employee exercise history, it has considered the statistics on exercise patterns of employees compiled by Huddart and Lang in Huddart, S., and M. Lang. 1996. “Employee Stock Option Exercises: An Empirical Analysis.” Journal of Accounting and Economics, vol. 21, no. 1 (February):5-43, The assumptions used to estimate the fair value of the share options granted are as follows: For the year ended December 31 2018 2019 2020 Risk-free rate 1.98%-2.10% 1.58%-1.80% 0.66%-1.84% Expected volatility range 42.40%-43.00% 37.40%-37.90% 37.3%-37.8% Exercise multiple 2.20 2.20-2.80 2.20-2.80 Fair market value per ordinary share as at valuation dates US$ US$ US$ US$ 0.76-US$1.94 The following table sets forth the amount of share-based compensation expense included in each of the relevant financial statement line items: For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ Cost of revenues 3,565 8,509 10,614 1,627 Selling and marketing expenses 5,889 37,808 62,270 9,543 General and administrative expenses 11,167 31,988 169,101 25,916 Research and development expenses 26,320 42,974 88,129 13,506 46,941 121,279 330,114 50,592

Restricted Net Assets

Restricted Net Assets	12 Months Ended
	Dec. 31, 2020
Other Restricted Assets [Abstract]
Restricted Net Assets	15. RESTRICTED NET ASSETS The Company’s ability to pay dividends is primarily dependent on the Company receiving distributions of funds from its subsidiaries. Relevant PRC statutory laws and regulations permit payments of dividends by the Group’s PRC subsidiaries only out of its retained earnings, if any, as determined in accordance with PRC accounting standards and regulations. The results of operations reflected in the consolidated financial statements prepared in accordance with U.S. GAAP differ from those reflected in the statutory financial statements of the Company’s PRC subsidiaries. In accordance with the Regulations on Enterprises with Foreign Investment of China and its Articles of Association, the Company’s PRC subsidiaries, being a foreign-invested enterprise established in the PRC, are required to provide certain statutory reserves, namely the general reserve fund, enterprise expansion fund and staff welfare and bonus fund, all of which are appropriated from net profit as reported in its PRC statutory accounts. The Company’s PRC subsidiaries are required to allocate at least 10% of its annual after-tax In accordance with the PRC Company Laws, the Company’s PRC subsidiaries and the VIEs must make appropriations from their annual after-tax non-distributable after-tax No appropriations were made to statutory reserves during all periods presented due to losses in the Company’s PRC subsidiaries and the VIEs. Under PRC laws and regulations, there are restrictions on the Company’s PRC subsidiaries and the VIEs with respect to transferring certain of their net assets to the Company either in the form of dividends, loans, or advances. Amounts restricted include paid-in S-X, Furthermore, cash transfers from the Company’s PRC subsidiaries to its subsidiaries outside of China are subject to PRC government control of currency conversion. Shortages in the availability of foreign currency may restrict the ability of the PRC subsidiaries and consolidated VIEs to remit sufficient foreign currency to pay dividends or other payments to the Company, or otherwise satisfy their foreign currency denominated obligations.

Loss Per Share

Loss Per Share	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
Loss Per Share	16. LOSS PER SHARE Basic and diluted loss per share for each of the years presented are calculated as follows: For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ Numerator: Net loss attributable to Kingsoft Cloud Holdings Limited (1,006,442 ) (1,111,199 ) (962,259 ) (147,471 ) Accretion to redemption value of redeemable convertible preferred shares (742,472 ) (49,725 ) (19,768 ) (3,030 ) Net loss attributable to ordinary shareholders - basic and diluted (1,748,914 ) (1,160,924 ) (982,027 ) (150,501 ) Denominator: Weighted average number of ordinary shares outstanding - basic and diluted 793,430,000 889,521,200 2,400,874,197 2,400,874,197 Basic and diluted loss per share (2.20 ) (1.31 ) (0.41 ) (0.06 ) For the periods presented herein, the computation of basic loss per share using the two-class

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Shareholders' Equity	17. SHAREHOLDERS’ EQUITY In February 2020, the Company entered into an arrangement to allow the senior executives to settle its due on demand interest bearing loans (“Settlement Arrangement”). Under the terms of the Settlement Arrangement, the Company will repurchase ordinary shares already issued to the executives for a cashless settlement of the outstanding loan amount including interest and related IIT. The number of ordinary shares to be repurchased is calculated by dividing the outstanding amount on settlement date by US$0.70 per share, which is below the estimated fair value per ordinary share of US$0.76 determined by the Company with the assistance of an independent appraiser. Therefore, there is no compensation expense to be recorded as a result of this repurchase. On February 29, 2020, the Company repurchased 5,475,254 ordinary shares at nil consideration from these senior executives in lieu of full settlement of the outstanding amount (Note 18). On April 7, 2020, the Company’s shareholders and Board of Directors approved to increase the Company’s authorized share capital to US$4,000 divided into 4,000,000,000 shares with a par value of US$0.001 each, consisting of (i) 2,282,750,429 ordinary shares (ii) 458,116,000 Series A Preferred Shares, (iii) 153,603,600 Series B Preferred Shares, (iv) 185,665,192 Series C Preferred Shares, (v) 842,738,782 Series D Preferred Shares, and (vi) 77,125,997 Series D+ Preferred Shares, respectively, which will become effective immediately prior to the completion of the Company’s IPO. All of the Preferred Shares issued and outstanding immediately prior to the completion of the IPO will be converted (by way of re-designation re-classification) On May 8, 2020, the Company completed its IPO on the NASDAQ Global Select Market. 30,000,000 ADS representing 450,000,000 ordinary shares were sold at $17.00 per ADS, or $1.13 per share. Additionally, the underwriters exercised their options to purchase an additional 67,500,000 ordinary shares in the form of 4,500,000 ADSs. Net proceeds from the IPO including underwriter options after deducting underwriting discount and offering expenses were approximately RMB3,875,394 (US$593,930). The deferred IPO costs were recorded as a reduction of the proceeds received from the IPO in the shareholders’ (deficit) equity. Upon completion of the IPO, all outstanding Preferred Shares were converted on a one-for-one On September 23, 2020, the Company completed its follow-on follow-on follow-on

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2020
Related Party Transactions [Abstract]
Related Party Transactions	18. RELATED PARTY TRANSACTIONS a) Related Parties Name of related parties Relationship with the Group Kingsoft Corporation Limited and its subsidiaries (other than all of entities of the Group) (“Kingsoft Group”) Principal shareholder of the Company Cheetah Mobile Inc. and its subsidiaries (“Cheetah Group”) Entity that Kingsoft Corporation Limited exercises significant influence over Xiaomi Corporation and its subsidiaries (“Xiaomi Group”) Entity controlled by a director of the Company The Company was controlled by Kingsoft before the completion of IPO. As Kingsoft lost control over the Company upon the completion of the IPO on May 8, 2020, Cheetah Group is no longer a related party of the Company. b) The Group had the following related party transactions: For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ Revenues: Public cloud services provided to Xiaomi Group 546,577 570,431 655,165 100,408 Public cloud services provided to Kingsoft Group 77,732 109,177 119,011 18,239 Public cloud services provided to Cheetah Group 6,202 8,579 3,111 477 Other services provided to Xiaomi Group — 120 82 13 630,511 688,307 777,369 119,137 Purchase of services from Xiaomi Group 18,868 — — — Purchase of devices from Xiaomi Group — 2,707 2,177 334 Interest expense on loan due to Kingsoft Group 25,111 4,925 — — Rental of building from Xiaomi Group* — 9,578 47,900 7,341 Rental of office space, and administrative services from Kingsoft Group** 21,313 24,524 13,801 2,115 65,292 41,734 63,878 9,790 Included in Note 11 is a guarantee by Kingsoft Group of the Group’s long-term third-party bank loan as at December 31, 2019 and 2020. * The Group entered into agreements to lease building and office space from Xiaomi Group. As of December 31, 2020, the related operating lease right-of-use ** The Group entered into short-term agreements to lease office space from Kingsoft Group in 2019. The agreements expired in December 2019. c) The Group had the following related party balances at the end of the year: As at December 31 2019 2020 2020 RMB RMB US$ Amounts due from related parties: Xiaomi Group 63,859 165,568 25,374 Cheetah Group 1,932 — — Kingsoft Group 43,716 45,258 6,936 Senior executives* 24,461 — — 133,968 210,826 32,310 Amounts due to related parties: Kingsoft Group 81,909 80,294 12,306 Xiaomi Group 22,350 32,704 5,012 104,259 112,998 17,318 * The Group provided interest bearing loans to senior executives, which were fully settled in February 2020 (Note 17). Interest income of RMB982 and RMB175 (US$27) was recorded as interest income during the years ended December 31, 2019 and 2020, respectively. All the balances with related parties were unsecured. All outstanding balances are also repayable on demand unless otherwise disclosed. No allowance for doubtful accounts was recognized for the amount due from related parties for the periods presented.

Commitments and contingencies

Commitments and contingencies	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and contingencies	19. COMMITMENTS AND CONTINGENCIES Capital expenditure commitments The Group has commitments for the construction of a data center of RMB110,813(US$16,983) at December 31, 2020, which are scheduled to be paid within one year. Contingencies The Group is currently not involved in any legal or administrative proceedings that may have a material adverse impact on the Group’s business, financial position or results of operations.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (loss)	12 Months Ended
	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income	20. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) RMB Balance as of January 1, 2019 419,750 Foreign currency translation adjustments, net of tax of nil 64,598 Balance as of December 31, 2019 484,348 Foreign currency translation adjustments, net of tax of nil (552,788 ) Balance as of December 31, 2020 (68,440 ) Balance as of December 31, 2020, in US$ (10,489 ) There have been no reclassifications out of accumulated other comprehensive income (loss) to net loss for the periods presented.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	21. SUBSEQUENT EVENTS In March 2021, the Group entered into a series of agreements with a target company and its existing shareholders. The target company is mainly engaged in providing content distribution, acceleration and other cloud-related laaS and PaaS edge computing solutions. Pursuant to the agreements, the Group will acquire 100% equity interests in the target company. The total consideration consists of cash and shares of the Company. As of the date of the consolidated financial statements were issued, the transaction was not fully completed. In March 2021, the Group entered into an investment agreement with another target company and its existing shareholders. The target company is mainly engaged in providing real time communication PaaS and SaaS solutions. Pursuant to the agreement, the Group will pay cash consideration to acquire 60% equity interests in the target company. In April 2021, the transaction was completed.

Condensed Financial Information

Condensed Financial Information of the Parent Company	12 Months Ended
	Dec. 31, 2020
Parent Company [Abstract]
Condensed Financial Information of the Parent Company	22. CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY Condensed Balance Sheets As at December 31 2019 2020 2020 RMB RMB US$ ASSETS Current assets: Cash and cash equivalents 540,361 68,012 10,423 Short-term investments — 217,448 33,325 Prepayments and other assets 31,132 266,280 40,809 Amounts due from subsidiaries 2,974,463 7,983,060 1,223,458 Amounts due from related parties 24,061 — — Total current assets 3,570,017 8,534,800 1,308,015 Non-current Investments in subsidiaries — — — Total non-current — — — Total assets 3,570,017 8,534,800 1,308,015 LIABILITIES, MEZZANINE EQUITY AND SHAREHOLDERS’ (DEFICIT) EQUITY Current liabilities: Accrued expenses and other liabilities 30,188 256,630 39,330 Income tax payable 2,514 2,524 387 Amounts due to subsidiaries 7 1,692 259 Amounts due to related parties 35 407 62 Total current liabilities 32,744 261,253 40,038 Other liabilities — 33,558 5,143 Total non-current — 33,558 5,143 Total liabilities 32,744 294,811 45,181 As at December 31 2019 2020 2020 RMB RMB US$ Commitments and contingencies Mezzanine equity: Series B convertible preferred shares (par value of US$0.001 per share; 153,603,600 and nil shares authorized, issued and outstanding as of December 31, 2019 and 2020, respectively) 337,268 — — Series C redeemable convertible preferred shares (par value of US$0.001 per share; 185,665,192 and nil shares authorized, issued and outstanding as of December 31, 2019 and 2020, respectively) 1,043,147 — — Series D redeemable convertible preferred shares (par value of US$0.001 per share; 842,738,782 and nil shares authorized, issued and outstanding as of December 31, 2019 and 2020, respectively) 5,965,273 — — Series D+ redeemable convertible preferred shares (par value of US$0.001 per share; 77,125,997 and nil shares authorized, 55,089,998 and nil shares issued and outstanding as of December 31, 2019 and 2020, respectively) 388,844 — — Total mezzanine equity 7,734,532 — — Shareholders’ (deficit) equity: Series A convertible preferred shares (par value of US$0.001 per share; 458,116,000 and nil shares authorized, issued and outstanding as of December 31, 2019 and 2020, respectively) 123,186 — — Ordinary shares (par value of US$0.001 per share; 1,282,750,429 and 4,000,000,000 shares authorized, 1,077,086,304 and 3,546,124,955 shares issued, 894,711,200 and 3,339,618,633 shares outstanding as of December 31, 2019 and 2020, respectively) 5,558 22,801 3,494 Additional paid-in 91,746 14,149,984 2,168,580 Accumulated deficit (4,902,097 ) (5,864,356 ) (898,751 ) Accumulated other comprehensive income (loss) 484,348 (68,440 ) (10,489 ) Total Kingsoft Cloud Holdings Limited shareholders’ (deficit) equity (4,197,259 ) 8,239,989 1,262,834 Total liabilities, mezzanine equity and shareholders’ (deficit) equity 3,570,017 8,534,800 1,308,015 Condensed Statements of Comprehensive Loss For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ Operating expenses: General and administrative expenses (795 ) (6,734 ) (27,052 ) (4,146 ) Total operating expenses (795 ) (6,734 ) (27,052 ) (4,146 ) Operating loss Interest income 112,477 52,829 10,199 1,563 Foreign exchange (loss) gain (22,652 ) (8,174 ) 30,931 4,740 Other (expenses) income, net (301 ) (300 ) 5,377 824 Changes in fair value of financial instruments 6,404 — — — Share of losses of subsidiaries and the VIEs (1,094,583 ) (1,145,405 ) (981,093 ) (150,357 ) Loss before income taxes (999,450 ) (1,107,784 ) (961,638 ) (147,376 ) Income tax expense (6,992 ) (3,415 ) (621 ) (95 ) Net loss (1,006,442 ) (1,111,199 ) (962,259 ) (147,471 ) Other comprehensive income (loss), net of tax of nil: Foreign currency translation adjustments 401,820 64,598 (552,788 ) (84,718 ) Comprehensive loss attributable to Kingsoft Cloud Holdings Limited shareholders (604,622 ) (1,046,601 ) (1,515,047 ) (232,189 ) Accretion to redemption value of redeemable convertible preferred shares (742,472 ) (49,725 ) (19,768 ) (3,030 ) Comprehensive loss attributable to ordinary shareholders (1,347,094 ) (1,096,326 ) (1,534,815 ) (235,219 ) Condensed Statements of Cash Flows For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ Net cash used in operating activities (2,396,432 ) (2,538,479 ) (6,203,310 ) (950,699 ) Net cash (used in) generated from investing activities (62,213 ) 2,166,312 (218,674 ) (33,513 ) Net cash generated from financing activities 2,851,882 370,294 5,945,666 911,214 Effect of exchange rate changes on cash and cash equivalents 136,227 10,921 3,969 607 Net increase (decrease) in cash and cash equivalents 529,464 9,048 (472,349 ) (72,391 ) Cash and cash equivalents at beginning of the year 1,849 531,313 540,361 82,814 Cash and cash equivalents at end of the year 531,313 540,361 68,012 10,423 Basis of presentation For the presentation of the parent company only condensed financial information, the Company records its investments in subsidiaries and the VIEs under the equity method of accounting as prescribed in ASC 323, Investments—Equity Method and Joint Ventures The subsidiaries did not pay any dividends to the Company for the periods presented. The Company does not have significant commitments or long-term obligations as of the period end. The parent company only financial statements should be read in conjunction with the Company’s consolidated financial statements.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation The consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles (“U.S. GAAP”).
Principles of consolidation	Principles of consolidation The consolidated financial statements of the Group include the financial statements of the Company, its subsidiaries, and the VIEs for which the Company is the primary beneficiary. All significant intercompany balances and transactions have been eliminated upon consolidation.
Use of estimates	Use of estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities at the balance sheet dates and the reported amounts of revenue and expenses during the reporting periods. Significant estimates and assumptions reflected in the Group’s consolidated financial statements include, but are not limited to, allowance for doubtful accounts for accounts receivable, measurement of operating right-of-use The Group reviews the estimated useful lives of its property and equipment on an ongoing basis. Due to increasing purchase of high-end
Foreign currency	Foreign currency The Group’s financial information is presented in Renminbi (“RMB”). The functional currency of the Company and Kingsoft Cloud Inc. is U.S. dollars (“US$”). The functional currency of Kingsoft Cloud Corporation Limited is Hong Kong Dollars (“HK$”). The functional currency of the Company’s subsidiaries and the VIEs located in the PRC is RMB. Transactions denominated in foreign currencies are re-measured re-measured Non-monetary re-measured
Convenience translation	Convenience translation Amounts in U.S. dollars are presented for the convenience of the reader and are translated at the noon buying rate of RMB6.5250 per US$1.00 on December 31, 2020 in the City of New York for cable transfers of RMB as certified for customs purposes by the Federal Reserve Bank of New York. No representation is made that the RMB amounts could have been, or could be, converted into US$ at such rate.
Cash and cash equivalents	Cash and cash equivalents Cash and cash equivalents consist of cash on hand and time deposits or other highly liquid investments placed with banks or other financial institutions which are unrestricted as to withdrawal or use and have original maturities of less than three months. There are no restricted cash balances for the periods presented.
Short-term investments	Short-term investments The Group’s short-term investments comprise primarily of cash deposits at fixed rates with original maturities of greater than three months, but less than 12 months.
Non-controlling interests	Non-controlling interests A non-controlling interest to non-controlling interests. to non-controlling interests as “non-controlling interests”
Equity investments	Equity investments The Group’s equity investments are long-term investments in unlisted companies based in the PRC over which the Group neither has significant influence nor control through investment in common stock or in-substance Investments — Equity Securities Fair Value Measurements and Disclosures The Group makes a qualitative assessment of whether the equity investments are impaired at each reporting date. If a qualitative assessment indicates that the investment is impaired, the entity has to estimate the investment’s fair value in accordance with the principles of ASC 820. If the fair value is less than the investment’s carrying value, the entity has to recognize an impairment loss in the statements of comprehensive loss equal to the difference between the carrying value and fair value. As of December 31, 2019 and 2020, the carrying amount of the Group’s equity investments measured at fair value using the measurement alternative was RMB114,876 and RMB126,583 (US$19,400), respectively, net of accumulated impairment of RMB nil and RMB nil (US$ nil), respectively. The Group recognized RMB nil and RMB14,301 (US$2,192) unrealized gains (upward adjustments), and RMB nil and RMB nil (US$ nil) unrecognized losses (downward adjustments) resulting from observable price changes in orderly transactions for an identical or similar investment of the same issuer in changes in fair value of financial instruments on the consolidated statements of comprehensive loss for years ended December 31, 2019 and 2020, respectively. For all periods presented, no equity securities were sold.
Fair value measurements	Fair value measurements Financial instruments of the Group primarily include cash and cash equivalents, short-term investments, accounts receivable, equity investments, accounts payable, other liabilities, amounts due from and due to related parties, bank loans, convertible preferred shares and redeemable convertible preferred shares. For equity investments, the Group elected to use the measurement alternative to measure those investments at cost, less any impairment, plus or minus changes resulting from observable price changes in orderly transactions for identical or similar investments of the same issuer, if any. The Group, with the assistance of an independent third-party valuation firm, determined the estimated fair value of its equity investments using the alternative measurement. The carrying amount of the bank loans approximates their fair values due to the fact that the related interest rates approximate the interest rates currently offered by financial institutions for similar debt instruments of comparable maturities. The convertible preferred shares and redeemable convertible preferred shares were initially recorded at issue price net of issuance costs. As it relates to the redeemable convertible preferred shares, the Group recognizes changes in the redemption value as they occur and adjusts the carrying value of the redeemable convertible preferred shares to equal the redemption value at the end of each reporting period. The Group applies ASC 820 in measuring fair value. ASC 820 defines fair value, establishes a framework for measuring fair value and requires disclosures to be provided on fair value measurement. The carrying amounts of the remaining financial instruments, approximate their fair values because of their short-term maturities. ASC 820 establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: Level 1—Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. Level 2—Include other inputs that are directly or indirectly observable in the marketplace. Level 3—Unobservable inputs which are supported by little or no market activity. ASC 820 describes three main approaches to measuring the fair value of assets and liabilities: (1) market approach; (2) income approach and (3) cost approach. The market approach uses prices and other relevant information generated from market transactions involving identical or comparable assets or liabilities. The income approach uses valuation techniques to convert future amounts to a single present value amount. The measurement is based on the value indicated by current market expectations about those future amounts. The cost approach is based on the amount that would currently be required to replace an asset.
Accounts receivable and allowance for doubtful accounts	Accounts receivable and allowance for doubtful accounts Accounts receivable are recognized and carried at original invoiced amount less an allowance for any potential uncollectible amounts. An allowance for doubtful accounts is recorded when collection of the full amount is no longer probable. In evaluating the collectability of receivable balances, the Group considers specific evidence including the aging of the receivable, the customer’s payment history, its current credit-worthiness and current economic trends. Accounts receivable are written off after all collection efforts have ceased.
Property and equipment, net	Property and equipment, net Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the assets, as follows: Category Estimated Electronic equipment 3–4 years Office equipment and fixtures 5 years Data center machinery and equipment 10 years Repair and maintenance costs are charged to expense as incurred, whereas the cost of renewals and betterments that extend the useful lives of property and equipment are capitalized as additions to the related assets. Retirements, sales and disposals of assets are recorded by removing the cost and accumulated depreciation from the asset and accumulated depreciation accounts with any resulting gain or loss reflected in the consolidated statements of comprehensive loss. Direct costs that are related to the construction of property and equipment, and incurred in connection with bringing the assets to their intended use are capitalized as construction in progress. Construction in progress is transferred to specific property and equipment, and the depreciation of these assets commences when the assets are ready for their intended use.
Intangible assets	Intangible assets Intangible assets are carried at cost less accumulated amortization and any recorded impairment. Intangible assets with finite useful lives are amortized using a straight-line method of amortization that reflects the estimated pattern in which the economic benefits of the intangible asset are to be consumed. The estimated useful life for the intangible assets is as follows: Category Estimated Domain names 10 years Purchased software and copyrights 3–10 years Others 3 years
Impairment of long-lived assets	Impairment of long-lived assets The Group evaluates its long-lived assets for impairment whenever events or changes in circumstances, such as a significant adverse change to market conditions that will impact the future use of the assets, indicate that the carrying amount of an asset may not be fully recoverable. When these events occur, the Group evaluates the recoverability of long-lived assets by comparing the carrying amount of the assets to the future undiscounted cash flows expected to result from the use of the assets and their eventual disposition. If the sum of the expected undiscounted cash flows is less than the carrying amount of the assets, the Group recognizes an impairment loss based on the excess of the carrying amount of the assets over their fair value. Fair value is generally determined by discounting the cash flows expected to be generated by the assets, when the market prices are not readily available. For all periods presented, there was no impairment of any of the Group’s long-lived assets.
Segment reporting	Segment reporting In accordance with ASC 280-10, Segment Reporting: Overall
Revenue recognition	Revenue recognition In May 2014, the FASB issued Accounting Standard Update (“ASU”) 2014-09, Revenue from Contracts with Customers Effective January 1, 2017, the Group elected to adopt the requirements of ASC 606 using the full retrospective method. The Group applies the five-step model outlined in ASC 606. The Group accounts for a contract when it has approval and commitment from the customer, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. Revenue is allocated to each performance obligation based on its standalone selling price. The Group generally determines standalone selling prices based on observable prices. If the standalone selling price is not observable through past transactions, the Group estimates the standalone selling price based on multiple factors, including, but not limited to, historical discounting trends for services, gross margin objectives, internal costs, and industry technology lifecycles. Timing of revenue recognition may differ from the timing of invoicing to customers. For certain revenue contracts, customers are required to pay before the services are delivered to the customer. The Group recognizes a contract asset or a contract liability in the consolidated balance sheets, depending on the relationship between the entity’s performance and the customer’s payment. Contract liabilities represents the excess of payments received as compared to the consideration earned and is reflected in “accrued expenses and other liabilities” in the Group’s consolidated balance sheets. Contract assets primarily relate to the Group’s rights to consideration for work completed in relation to its services performed but not billed at the reporting date, and is reflected in “prepayments and other assets” in the Group’s consolidated balance sheets. The contract assets are transferred to the receivables when the rights become unconditional. Using the practical expedient in ASC 606, the Group does not adjust the promised amount of consideration for the effects of a significant financing component if it expects, at contract inception, that the period between the transfer of the promised good or service to the customer and when the customer pays for that good or service will be one year or less. Pursuant to ASC 606-10-32-2A, Public cloud services The Group provides integrated cloud-based services including cloud computing, storage and delivery. The nature of the Group’s performance obligation is a single performance obligation to stand ready to provide an unspecified quantify of integrated cloud-based services each day throughout the contract period. The Group uses monthly utilization records, an output measure, to recognize revenue over time as it most faithfully depicts the simultaneous consumption and delivery of services. At the end of each month, the transaction consideration is fixed based on utilization records and no variable consideration exists. Enterprise cloud services The Group provides comprehensive customized cloud-based solutions, which are typically completed within one to six months (“Solutions”). The components within the Solutions are not distinct within the context of the contract because they are considered highly interdependent and the customer can only benefit from these components in conjunction with one another as a two-way , respectively. Others The Group acts an agent to arrange for advertising services to be provided by popular external applications, primarily Xiaomi Corporation (“promotion services”). The Group recognizes revenue on a net basis because the Group is not responsible for fulfilling the promise to provide the specified advertising service, neither does it control the advertising resources nor have inventory risk. The net fee revenue from promotion services is recognized at a point in time when the advertisements are delivered by the external application. The Group discontinued providing all promotion services in early 2019. In 2019 and 2020, others mainly include services ancillary to the Group’s other revenue streams such as IoT solutions. The components within the solutions are not distinct within the context of the contract because they are considered highly interdependent and the customer can only benefit from these components in conjunction with one another as a two-way
Cost of revenue	Cost of revenue Cost of revenues primarily includes bandwidth and internet data center costs, depreciation expense of electronic equipment, data center machinery and equipment, salaries and benefits for employees directly involved in revenue generation activities, and other expenses such as software purchases directly attributable to the provision of services.
Research and development	Research and development Research and development expenses primarily consist of salaries and benefits for research and development personnel, and third party service provider costs. The Group expenses research and development costs as they are incurred.
Advertising expenditures	Advertising expenditures Advertising costs are expensed when incurred and are included in sales and marketing expenses in the consolidated statements of comprehensive loss. For the years ended December 31, 2018, 2019 and 2020, the advertising expenses were approximately
Government grants	Government grants Government grants primarily consist of financial grants received from provincial and local governments for operating a business in their jurisdictions and compliance with specific policies promoted by the local governments. There are no defined rules and regulations to govern the criteria necessary for companies to receive such benefits, and the amount of financial subsidy is determined at the discretion of the relevant government authorities. Government grants of non-operating non-operating
Leases	Leases The Group adopted ASU No. 2016-02, Leases (Topic 842) The Group determines if an arrangement is a lease or contains a lease at lease inception. For operating leases, the Group recognizes a right-of-use asset and a lease liability on the consolidated balance sheets based on the present value of the lease payments over the lease term at commencement date. As most of the Group’s leases do not provide an implicit rate, the Group estimates its incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. The incremental borrowing rate is estimated to approximate the interest rate on a collateralized basis with similar terms and payments, and in economic environments where the leased asset is located. Lease expense is recorded on a straight-line basis over the lease term. Upon adoption, the Group recognized operating lease right-of-use right-of-use non-current
Comprehensive loss	Comprehensive loss Comprehensive loss is defined as the changes in equity of the Group during a period from transactions and other events and circumstances excluding transactions resulting from investments by shareholders and distributions to shareholders. Among other disclosures, ASC 220, Comprehensive Income
Income taxes	Income taxes The Group follows the liability method of accounting for income taxes in accordance with ASC 740, Income Taxes more-likely-than-not The Group accounted for uncertainties in income taxes in accordance with ASC 740. Interest and penalties arising from underpayment of income taxes shall be computed in accordance with the related PRC tax law. The amount of interest expense is computed by applying the applicable statutory rate of interest to the difference between the tax position recognized and the amount previously taken or expected to be taken in a tax return. Interest and penalties recognized in accordance with ASC 740 are classified in the consolidated statements of comprehensive loss as income tax expense. In accordance with the provisions of ASC 740, the Group recognizes in its consolidated financial statements the impact of a tax position if a tax return position or future tax position is “more likely than not” to prevail based on the facts and technical merits of the position. Tax positions that meet the “more likely than not” recognition threshold are measured at the largest amount of tax benefit that has a greater than fifty percent likelihood of being realized upon settlement. The Group’s estimated liability for unrecognized tax benefits, if any, will be recorded in the “other non-current
Share-based compensation	Share-based compensation Awards granted to employees The Group applies ASC 718, Compensation—Stock Compensation The Group uses the accelerated method for all awards granted with graded vesting based on service conditions. The Group has early adopted ASU 2016-09, Compensation—Stock Compensation , Improvements to Employee Share-Based Payment Accounting
Loss per share	Loss per share In accordance with ASC 260, Earnings Per Share two-class two-class two-class Diluted loss per share is calculated by dividing net loss attributable to ordinary shareholders as adjusted for the effect of dilutive ordinary equivalent shares, if any, by the weighted average number of ordinary and dilutive ordinary equivalent shares outstanding during the period. Ordinary equivalent shares consist of the ordinary shares issuable upon the conversion of the Company’s convertible preferred shares and redeemable convertible preferred shares using the if-converted
Employee benefit expenses	Employee benefit expenses All eligible employees of the Group are entitled to staff welfare benefits including medical care, welfare grants, unemployment insurance and pension benefits through a PRC government-mandated multi-employer defined contribution plan. The Group is required to accrue for these benefits based on certain percentages of the qualified employees’ salaries. The Group is required to make contributions to the plans out of the amounts accrued. The PRC government is responsible for the medical benefits and the pension liability to be paid to these employees and the Group’s obligations are limited to the amounts contributed. The Group has no further payment obligations once the contributions have been paid. The Group recorded employee benefit expenses of RMB114,305, RMB155,848 and RMB126,784
Impact of COVID-19	Impact of COVID-19 For the year ended December 31, 2020, COVID-19 COVID-19’s COVID-19
Recent accounting pronouncements	Recent accounting pronouncements The Company is an emerging growth company (“EGC”) as defined by the Jumpstart Our Business Startups Act (“JOBS Act”). The JOBS Act provides that an EGC can take advantage of extended transition periods for complying with new or revised accounting standards. This allows an EGC to delay adoption of certain accounting standards until those standards would otherwise apply to private companies. The Company elected to take advantage of the extended transition periods. However, this election will not apply should the Company cease to be classified as an EGC. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326) Measurement of Credit Losses on Financial Instruments 2016-13”). 2016-13 available-for-sale 2016-13 In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other-Internal-Use 350-40): internal-use 350-40 2018-15 In December 2019, the FASB issued ASU 2019-12 , Simplifying the Accounting for Income Taxes In January 2020, the FASB issued ASU No. 2020-01, Investments—Equity Securities (Topic 321), Investments—Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815) —Clarifying the Interactions between Topic 321, Topic 323, and Topic 815 (a consensus of the FASB Emerging Issues Task Force) 2020-01”), 2020-01 2020-01

Organization and Basis of Pre_2

Organization and Basis of Presentation (Tables)	12 Months Ended
	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Disclosure Details of Principal Subsidiaries and Variable Interest Entities	As of December 31, 2020, the Company’s principal subsidiaries, variable interest entities, and subsidiaries of the variable interest entities, are as follows: Name Place of establishment Date of establishment/ acquisition Percentage of equity interest attributable to the Company Principal activities Subsidiaries: Kingsoft Cloud Corporation Limited HK February 1, 2012 100 % Cloud services Kingsoft Cloud Inc. U.S. December 22, 2017 100 % Cloud services Wuhan Kingsoft Cloud Information Technology Co., Ltd. PRC December 26, 2017 100 % Cloud services Beijing Kingsoft Cloud Technology Co., Ltd. (“Beijing Kingsoft Cloud”)* PRC April 9, 2012 100 % Research and development Beijing Yunxiang Zhisheng Technology Co., Ltd. (“Yunxiang Zhisheng”)* PRC December 15, 2015 100 % Research and development Variable interest entities: Zhuhai Kingsoft Cloud Technology Co., Ltd. (“Zhuhai Kingsoft Cloud”) PRC November 9, 2012 Nil Investment holding Kingsoft Cloud (Beijing) Information Technology Co., Ltd. (“Kingsoft Cloud Information”) PRC April 13, 2018 Nil Investment holding Variable interest entities’ subsidiaries: Beijing Kingsoft Cloud Network Technology Co., Ltd. (“Beijing Kingsoft Cloud Network Technology”) PRC November 9, 2012 Nil Cloud services Beijing Jinxun Ruibo Network Technology Co., Ltd. (“Beijing Jinxun Ruibo”) PRC December 17, 2015 Nil Cloud services Nanjing Qianyi Shixun Information Technology Co., Ltd. PRC March 31, 2016 Nil Cloud services * collectively, the “WFOE”
Schedule of Assets Liabilities Results of Variable Interest Entities	The following table sets forth the assets, liabilities, results of operations and cash flows of the VIEs included in the Company’s consolidated balance sheets, consolidated statements of comprehensive loss and consolidated statements of cash flows: As at December 31 2019 2020 2020 RMB RMB US$ ASSETS Current assets: Cash and cash equivalents 751,103 1,429,508 219,082 Accounts receivable, net of allowance of RMB22,894 and RMB15,745 (US$2,413) as of December 31, 2019 and 2020, respectively 1,317,110 2,258,313 346,102 Prepayments and other assets 385,402 630,121 96,570 Amounts due from related parties 106,368 204,275 31,306 Amounts due from subsidiaries of the Group 787,900 1,631,592 250,052 Total current assets 3,347,883 6,153,809 943,112 Non-current Property and equipment, net 1,465,338 1,727,620 264,769 Intangible assets, net 6,487 14,980 2,296 Prepayments and other assets 32,624 9,978 1,529 Equity investments 72,000 86,251 13,219 Amounts due from related parties 2,336 4,712 722 Operating lease right-of-use — 210,338 32,236 Total non-current 1,578,785 2,053,879 314,771 Total assets 4,926,668 8,207,688 1,257,883 Current liabilities Accounts payable 1,236,706 2,013,428 308,571 Accrued expenses and other liabilities 780,991 521,307 79,894 Short-term bank loans — 278,488 42,680 Long-term bank loan, current portion 100,000 74,351 11,395 Income tax payable — 45 7 Amounts due to related parties 50,472 56,795 8,704 Current operating lease liabilities — 56,261 8,622 Amounts due to subsidiaries of the Group 1,010,663 903,879 138,526 Total current liabilities 3,178,832 3,904,554 598,399 Non-current Long-term bank loan 74,351 — — Deferred tax liabilities 206 29 4 Other liabilities — 7,020 1,076 Non-current — 146,012 22,377 Amounts due to subsidiaries of the Group 4,244,727 7,367,267 1,129,084 Total non-current 4,319,284 7,520,328 1,152,541 Total liabilities 7,498,116 11,424,882 1,750,940
Schedule of Operations and Cash Flows Results of Variable Interest Entities	For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ Revenues 2,218,172 3,882,352 6,377,158 977,342 Net loss (872,291 ) (970,344 ) (922,908 ) (141,442 ) Net cash used in operating activities (451,199 ) (785,378 ) (833,479 ) (127,736 ) Net cash used in investing activities (990,734 ) (836,981 ) (1,471,637 ) (225,538 ) Net cash generated from financing activities 1,838,484 1,618,102 2,802,088 429,439

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Schedule of Property Plant and Equipment Useful Lives	Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the assets, as follows: Category Estimated Electronic equipment 3–4 years Office equipment and fixtures 5 years Data center machinery and equipment 10 years
Schedule of Finite Lived Intangible Assets Useful Lives	The estimated useful life for the intangible assets is as follows: Category Estimated Domain names 10 years Purchased software and copyrights 3–10 years Others 3 years

Revenues (Tables)

Revenues (Tables)	12 Months Ended
	Dec. 31, 2020
Revenue Recognition and Deferred Revenue [Abstract]
Summary of Disaggregation of Revenue	The following table presents the Group’s revenues from contracts with customers disaggregated by material revenue category: For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ Public cloud services recognized over time 2,110,513 3,458,843 5,166,851 791,855 Enterprise cloud services: Solutions recognized at a point in time 94,369 485,991 1,368,544 209,739 Maintenance recognized over time — 317 4,145 635 94,369 486,308 1,372,689 210,374 Others: Others recognized at a point in time 13,290 11,202 36,611 5,611 Others recognized over time — — 1,156 177 13,290 11,202 37,767 5,788 2,218,172 3,956,353 6,577,307 1,008,017
Summary of Revenue, Remaining Performance Obligation	The transaction prices allocated to the remaining performance obligations (unsatisfied or partially unsatisfied) as at December 31, 2020 are related to enterprise cloud services and others, which are as follows: RMB US$ Within one year 8,582 1,315 More than one year 4,576 701 Total 13,158 2,016
Summary of Contract with Customer Liability Recognized	For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ Revenue recognized from amounts included in contract liabilities at the beginning of the period 19,312 22,782 37,550 5,755

Accounts Receivable, Net (Table

Accounts Receivable, Net (Tables)	12 Months Ended
	Dec. 31, 2020
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]
Schedule of Accounts Receivable, Net	As at December 31 2019 2020 2020 RMB RMB US$ Accounts receivable 1,370,375 2,350,641 360,252 Allowance for doubtful accounts (22,894 ) (15,770 ) (2,417 ) Accounts receivable, net 1,347,481 2,334,871 357,835
Schedule of the Movement in the allowance for Doubtful Accounts	The movements in the allowance for doubtful accounts were as follows: As at December 31 2018 2019 2020 2020 RMB RMB RMB US$ Balance at beginning of the year 2,183 2,249 22,894 3,509 Additions (reversals) 66 20,645 (7,124 ) (1,092 ) Balance at end of the year 2,249 22,894 15,770 2,417

Prepayments and Other Assets (T

Prepayments and Other Assets (Tables)	12 Months Ended
	Dec. 31, 2020
Prepayments and Other Assets [Abstract]
Schedule of Prepayments and Other Assets	As at December 31 2019 2020 2020 RMB RMB US$ Current portion: Prepayments to suppliers 15,903 78,621 12,049 Contract costs 12,979 13,882 2,128 VAT prepayments 360,401 470,567 72,118 Interest receivable 3,114 14,204 2,177 Deferred IPO costs 11,971 — — Individual income tax receivable* (Note 10) — 231,377 35,460 Others 17,570 78,435 12,020 421,938 887,086 135,952 Non-current Prepayments for electronic equipment 33,970 8,978 1,376 Others 2,498 2,846 436 36,468 11,824 1,812 * Represents amounts due from certain employees related to their individual income taxes (“IIT”) arising from exercise and vesting of share-based awards.

Property and Equipment, Net (Ta

Property and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment, Net	As at December 31 2019 2020 2020 RMB RMB US$ Electronic equipment 3,233,327 4,164,384 638,219 Office equipment and fixtures 1,444 9,759 1,496 Data center machinery and equipment 131,037 135,068 20,700 Construction in progress 849 5,454 836 3,366,657 4,314,665 661,251 Less: accumulated depreciation (1,645,683 ) (2,357,875 ) (361,360 ) Property and equipment, net 1,720,974 1,956,790 299,891

Intangible Assets, Net (Tables)

Intangible Assets, Net (Tables)	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets, Net	As at December 31 2019 2020 2020 RMB RMB US$ Domain names 7,041 7,020 1,076 Purchased software and copyrights 6,564 20,807 3,189 Others 4,598 7,469 1,145 18,203 35,296 5,410 Less: accumulated amortization Domain names (2,309 ) (3,035 ) (465 ) Purchased software and copyrights (5,128 ) (10,268 ) (1,574 ) Others (3,338 ) (5,420 ) (831 ) (10,775 ) (18,723 ) (2,870 ) Intangible assets, net 7,428 16,573 2,540
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	As of December 31, 2020, estimated amortization expense of the existing intangible assets for each of the next five years and thereafter is as follows: RMB US$ 2021 10,421 1,597 2022 2,322 356 2023 1,350 207 2024 883 135 2025 and thereafter 1,597 245 Total 16,573 2,540

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Summary of Undiscounted Future Minimum Payments under the Group's Operating Lease Liabilities	The undiscounted future minimum payments under the Group’s operating lease liabilities and reconciliation to the operating lease liabilities recognized on the consolidated balance sheet was as below: RMB US$ 2021 79,495 12,183 2022 51,151 7,839 2023 48,582 7,446 2024 49,123 7,528 2025 and thereafter 101,412 15,542 Total future lease payments 329,763 50,538 Less: imputed interest (70,336 ) (10,779 ) Total lease liability balance 259,427 39,759

Accrued Expenses and Other Li_2

Accrued Expenses and Other Liabilities (Tables)	12 Months Ended
	Dec. 31, 2020
Accrued Liabilities and Other Liabilities [Abstract]
Schedule of Accrued Expenses and Other Liabilities	As at December 31 2019 2020 2020 RMB RMB US$ Current portion: Customer advances* 79,608 191,357 29,327 Salary and welfare payable 136,762 117,506 18,009 Purchase of property and equipment 609,363 181,038 27,745 Acquisition of equity investments 15,500 — — Accrued expenses 67,027 44,559 6,829 Other tax and surcharges payable 10,608 25,227 3,866 Deferred government grants 7,919 10,321 1,582 Individual income tax payable** (Note 6) — 231,377 35,460 Others*** 22,426 43,989 6,741 949,213 845,374 129,559 Non-current Deferred government grants — 7,020 1,076 Others*** — 33,558 5,143 — 40,578 6,219 * The amount represents contract liabilities for rendering of services. The increase in customer advances as compared to the year ended December 31, 2019 is a result of the increase in consideration received from the Group’s customers. ** Represents IIT payable to the tax bureau on behalf of certain employees related to their exercise and vesting of share-based awards. *** In July 2020, the Company received a reimbursement of (equivalent to from the depository for the establishment and maintenance of the ADS program (“ADS Reimbursement”). As of December 31, 2020, were included in the current portion and non-current portion of accrued expenses and other liabilities, respectively. The ADS Reimbursement will be released to the consolidated statements of comprehensive loss in equal amounts over the ADS program term.

Bank Loans (Tables)

Bank Loans (Tables)	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Schedule of Bank Loans	As at December 31 2019 2020 2020 RMB RMB US$ Short-term bank loans — 278,488 42,680 Long-term third-party bank loan guaranteed by a related party (Note 18): Current portion 100,000 74,351 11,395 Non-current 74,351 — — 174,351 352,839 54,075

Taxation (Tables)

Taxation (Tables)	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Schedule of Income Before Income Tax, Domestic and Foreign	Loss before income taxes consists of: For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ PRC (1,055,676 ) (1,167,367 ) (1,095,015 ) (167,817 ) Non-PRC 58,866 65,171 147,721 22,639 (996,810 ) (1,102,196 ) (947,294 ) (145,178 )
Schedule of Components of Income Tax Expense (Benefit)	The current and deferred components of income tax expense appearing in the consolidated statements of comprehensive loss are as follows: For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ Current income tax expense 9,809 9,180 15,081 2,311 Deferred income tax benefit (177 ) (177 ) (177 ) (27 ) 9,632 9,003 14,904 2,284
Schedule of Effective Income Tax Rate Reconciliation	The reconciliation of income tax expense computed using the PRC statutory tax rate to the actual income tax expense is as follows: For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ Loss before income tax (996,810 ) (1,102,196 ) (947,294 ) (145,178 ) Income tax computed at the PRC statutory tax rate of 25% (249,203 ) (275,549 ) (236,824 ) (36,295 ) Effect of tax holiday and preferential tax rates (29,103 ) 11,493 (44,121 ) (6,762 ) Effect of different tax rates in different jurisdictions (20,980 ) (11,626 ) 10,580 1,621 Other non-taxable (4,018 ) (21,557 ) (35,454 ) (5,434 ) Non-deductible 20,931 64,095 14,060 2,156 Share based compensation costs 11,794 30,320 82,528 12,648 Research and development super deduction (75,787 ) (94,401 ) (113,388 ) (17,377 ) Withholding tax and others 9,809 9,180 11,581 1,775 Change in valuation allowance 369,257 259,031 399,756 61,265 True-up — — (83,342 ) (12,773 ) Tax rate change on deferred items (23,068 ) 38,017 9,528 1,460 Income tax expense 9,632 9,003 14,904 2,284
Schedule of Deferred Tax Assets and Liabilities	The significant components of the Group’s deferred tax assets and liabilities are as follows: As at December 31 2019 2020 2020 RMB RMB US$ Deferred tax assets: Tax loss carry forward 921,045 1,454,702 222,943 Accrued expenses 71,720 56,111 8,599 Depreciation 2,775 4,990 765 Allowance for doubtful accounts 2,925 3,156 484 Government grant 2,268 6,175 946 Operating lease liabilities — 56,706 8,691 Accrued interest — 66,609 10,208 Others 1,104 — — Less: valuation allowance (1,001,837 ) (1,401,416 ) (214,776 ) — 247,033 37,860 Deferred tax liabilities: Operating lease right-of-use — 54,658 8,377 One-time — 191,107 29,288 Long-lived assets arising from acquisition 206 29 4 Others — 1,268 195 206 247,062 37,864
Summary of Unrecognized Tax Benefit	A reconciliation of the beginning and ending amount of unrecognized tax benefit is as follows: As at December 31 2020 2020 RMB US$ Balance at beginning of the year — — Additions based on tax positions related to current year 12,613 1,933 Balance at end of the year 12,613 1,933

Share-based Payments (Tables)

Share-based Payments (Tables)	12 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Summary of the Activity Under the Share Option Scheme	A summary of the activity under the Share Option Scheme is stated below: Number of options Weighted- average exercise price Weighted- average grant-date fair value Weighted- average remaining contractual term Aggregate intrinsic value US$ US$ Years US$ Outstanding, December 31, 2019 129,852,000 0.07 0.37 7.32 Granted 12,387,915 0.07 Forfeited (5,696,000 ) 0.07 Expired (788,000 ) 0.07 Exercised (48,996,540 ) 0.07 Outstanding, December 31, 2020 86,759,375 0.07 0.54 7.12 2.83 Vested and expected to vest at December 31, 2020 86,759,375 0.07 0.54 7.12 2.83 Exercisable at December 31, 2020 36,603,460 0.07 0.27 5.64 2.83
Summary of the Activity for the Restricted Shares Issued Under the Share Award Scheme	A summary of the activity for the restricted shares issued under the Share Award Scheme is stated below: Number of shares Weighted-average grant date fair value US$ Outstanding, December 31, 2019 53,296,176 0.70 Granted 25,300,000 0.78 Vested (21,470,416 ) 0.65 Forfeited (3,523,200 ) 0.76 Outstanding, December 31, 2020 53,602,560 0.76 Expected to vest at December 31, 2020 53,602,560 0.76
Summary of the Activity for the Restricted Shares Issued Under the Share Award Scheme	A summary of the activity for the options issued under the Share Award Scheme is stated below: Number of options Weighted- average exercise price Weighted- average grant- fair value Weighted- average remaining contractual term Aggregate intrinsic value US$ US$ Years US$ Outstanding, December 31, 2019 19,556,800 0.87 0.30 9.93 Granted 19,200,000 0.77 Forfeited (1,148,800 ) 0.87 Exercised (416,160 ) 0.87 Outstanding, December 31, 2020 37,191,840 0.82 0.31 9.00 2.09 Vested and expected to vest at December 31, 2020 37,191,840 0.82 0.31 9.00 2.09 Exercisable at December 31, 2020 7,376,800 0.76 0.30 9.05 2.15
Summary of Assumptions Used To Estimate the Fair Value of the Share Options	The assumptions used to estimate the fair value of the share options granted are as follows: For the year ended December 31 2018 2019 2020 Risk-free rate 1.98%-2.10% 1.58%-1.80% 0.66%-1.84% Expected volatility range 42.40%-43.00% 37.40%-37.90% 37.3%-37.8% Exercise multiple 2.20 2.20-2.80 2.20-2.80 Fair market value per ordinary share as at valuation dates US$ US$ US$ US$ 0.76-US$1.94
Summary of Share-based Compensation Expense	The following table sets forth the amount of share-based compensation expense included in each of the relevant financial statement line items: For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ Cost of revenues 3,565 8,509 10,614 1,627 Selling and marketing expenses 5,889 37,808 62,270 9,543 General and administrative expenses 11,167 31,988 169,101 25,916 Research and development expenses 26,320 42,974 88,129 13,506 46,941 121,279 330,114 50,592

Loss Per Share (Tables)

Loss Per Share (Tables)	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	Basic and diluted loss per share for each of the years presented are calculated as follows: For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ Numerator: Net loss attributable to Kingsoft Cloud Holdings Limited (1,006,442 ) (1,111,199 ) (962,259 ) (147,471 ) Accretion to redemption value of redeemable convertible preferred shares (742,472 ) (49,725 ) (19,768 ) (3,030 ) Net loss attributable to ordinary shareholders - basic and diluted (1,748,914 ) (1,160,924 ) (982,027 ) (150,501 ) Denominator: Weighted average number of ordinary shares outstanding - basic and diluted 793,430,000 889,521,200 2,400,874,197 2,400,874,197 Basic and diluted loss per share (2.20 ) (1.31 ) (0.41 ) (0.06 )

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2020
Related Party Transactions [Abstract]
Schedule of Related Parties And Nature Of Relationship	a) Related Parties Name of related parties Relationship with the Group Kingsoft Corporation Limited and its subsidiaries (other than all of entities of the Group) (“Kingsoft Group”) Principal shareholder of the Company Cheetah Mobile Inc. and its subsidiaries (“Cheetah Group”) Entity that Kingsoft Corporation Limited exercises significant influence over Xiaomi Corporation and its subsidiaries (“Xiaomi Group”) Entity controlled by a director of the Company
Schedule of Related Party Transactions	b) The Group had the following related party transactions: For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ Revenues: Public cloud services provided to Xiaomi Group 546,577 570,431 655,165 100,408 Public cloud services provided to Kingsoft Group 77,732 109,177 119,011 18,239 Public cloud services provided to Cheetah Group 6,202 8,579 3,111 477 Other services provided to Xiaomi Group — 120 82 13 630,511 688,307 777,369 119,137 Purchase of services from Xiaomi Group 18,868 — — — Purchase of devices from Xiaomi Group — 2,707 2,177 334 Interest expense on loan due to Kingsoft Group 25,111 4,925 — — Rental of building from Xiaomi Group* — 9,578 47,900 7,341 Rental of office space, and administrative services from Kingsoft Group** 21,313 24,524 13,801 2,115 65,292 41,734 63,878 9,790 Included in Note 11 is a guarantee by Kingsoft Group of the Group’s long-term third-party bank loan as at December 31, 2019 and 2020. * The Group entered into agreements to lease building and office space from Xiaomi Group. As of December 31, 2020, the related operating lease right-of-use ** The Group entered into short-term agreements to lease office space from Kingsoft Group in 2019. The agreements expired in December 2019.
Schedule of Related Party Balances	c) The Group had the following related party balances at the end of the year: As at December 31 2019 2020 2020 RMB RMB US$ Amounts due from related parties: Xiaomi Group 63,859 165,568 25,374 Cheetah Group 1,932 — — Kingsoft Group 43,716 45,258 6,936 Senior executives* 24,461 — — 133,968 210,826 32,310 Amounts due to related parties: Kingsoft Group 81,909 80,294 12,306 Xiaomi Group 22,350 32,704 5,012 104,259 112,998 17,318 * The Group provided interest bearing loans to senior executives, which were fully settled in February 2020 (Note 17). Interest income of RMB982 and RMB175 (US$27) was recorded as interest income during the years ended December 31, 2019 and 2020, respectively.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (loss) (Tables)	12 Months Ended
	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income	RMB Balance as of January 1, 2019 419,750 Foreign currency translation adjustments, net of tax of nil 64,598 Balance as of December 31, 2019 484,348 Foreign currency translation adjustments, net of tax of nil (552,788 ) Balance as of December 31, 2020 (68,440 ) Balance as of December 31, 2020, in US$ (10,489 )

Condensed Financial Informati_2

Condensed Financial Information of the Parent Company (Tables)	12 Months Ended
	Dec. 31, 2020
Parent Company [Abstract]
Summary of Parent Company Balance Sheet	As at December 31 2019 2020 2020 RMB RMB US$ ASSETS Current assets: Cash and cash equivalents 540,361 68,012 10,423 Short-term investments — 217,448 33,325 Prepayments and other assets 31,132 266,280 40,809 Amounts due from subsidiaries 2,974,463 7,983,060 1,223,458 Amounts due from related parties 24,061 — — Total current assets 3,570,017 8,534,800 1,308,015 Non-current Investments in subsidiaries — — — Total non-current — — — Total assets 3,570,017 8,534,800 1,308,015 LIABILITIES, MEZZANINE EQUITY AND SHAREHOLDERS’ (DEFICIT) EQUITY Current liabilities: Accrued expenses and other liabilities 30,188 256,630 39,330 Income tax payable 2,514 2,524 387 Amounts due to subsidiaries 7 1,692 259 Amounts due to related parties 35 407 62 Total current liabilities 32,744 261,253 40,038 Other liabilities — 33,558 5,143 Total non-current — 33,558 5,143 Total liabilities 32,744 294,811 45,181 As at December 31 2019 2020 2020 RMB RMB US$ Commitments and contingencies Mezzanine equity: Series B convertible preferred shares (par value of US$0.001 per share; 153,603,600 and nil shares authorized, issued and outstanding as of December 31, 2019 and 2020, respectively) 337,268 — — Series C redeemable convertible preferred shares (par value of US$0.001 per share; 185,665,192 and nil shares authorized, issued and outstanding as of December 31, 2019 and 2020, respectively) 1,043,147 — — Series D redeemable convertible preferred shares (par value of US$0.001 per share; 842,738,782 and nil shares authorized, issued and outstanding as of December 31, 2019 and 2020, respectively) 5,965,273 — — Series D+ redeemable convertible preferred shares (par value of US$0.001 per share; 77,125,997 and nil shares authorized, 55,089,998 and nil shares issued and outstanding as of December 31, 2019 and 2020, respectively) 388,844 — — Total mezzanine equity 7,734,532 — — Shareholders’ (deficit) equity: Series A convertible preferred shares (par value of US$0.001 per share; 458,116,000 and nil shares authorized, issued and outstanding as of December 31, 2019 and 2020, respectively) 123,186 — — Ordinary shares (par value of US$0.001 per share; 1,282,750,429 and 4,000,000,000 shares authorized, 1,077,086,304 and 3,546,124,955 shares issued, 894,711,200 and 3,339,618,633 shares outstanding as of December 31, 2019 and 2020, respectively) 5,558 22,801 3,494 Additional paid-in 91,746 14,149,984 2,168,580 Accumulated deficit (4,902,097 ) (5,864,356 ) (898,751 ) Accumulated other comprehensive income (loss) 484,348 (68,440 ) (10,489 ) Total Kingsoft Cloud Holdings Limited shareholders’ (deficit) equity (4,197,259 ) 8,239,989 1,262,834 Total liabilities, mezzanine equity and shareholders’ (deficit) equity 3,570,017 8,534,800 1,308,015
Summary of Parent Company Income Statement	For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ Operating expenses: General and administrative expenses (795 ) (6,734 ) (27,052 ) (4,146 ) Total operating expenses (795 ) (6,734 ) (27,052 ) (4,146 ) Operating loss Interest income 112,477 52,829 10,199 1,563 Foreign exchange (loss) gain (22,652 ) (8,174 ) 30,931 4,740 Other (expenses) income, net (301 ) (300 ) 5,377 824 Changes in fair value of financial instruments 6,404 — — — Share of losses of subsidiaries and the VIEs (1,094,583 ) (1,145,405 ) (981,093 ) (150,357 ) Loss before income taxes (999,450 ) (1,107,784 ) (961,638 ) (147,376 ) Income tax expense (6,992 ) (3,415 ) (621 ) (95 ) Net loss (1,006,442 ) (1,111,199 ) (962,259 ) (147,471 ) Other comprehensive income (loss), net of tax of nil: Foreign currency translation adjustments 401,820 64,598 (552,788 ) (84,718 ) Comprehensive loss attributable to Kingsoft Cloud Holdings Limited shareholders (604,622 ) (1,046,601 ) (1,515,047 ) (232,189 ) Accretion to redemption value of redeemable convertible preferred shares (742,472 ) (49,725 ) (19,768 ) (3,030 ) Comprehensive loss attributable to ordinary shareholders (1,347,094 ) (1,096,326 ) (1,534,815 ) (235,219 )
Summary of Parent Company Cash Flow	For the year ended December 31 2018 2019 2020 2020 RMB RMB RMB US$ Net cash used in operating activities (2,396,432 ) (2,538,479 ) (6,203,310 ) (950,699 ) Net cash (used in) generated from investing activities (62,213 ) 2,166,312 (218,674 ) (33,513 ) Net cash generated from financing activities 2,851,882 370,294 5,945,666 911,214 Effect of exchange rate changes on cash and cash equivalents 136,227 10,921 3,969 607 Net increase (decrease) in cash and cash equivalents 529,464 9,048 (472,349 ) (72,391 ) Cash and cash equivalents at beginning of the year 1,849 531,313 540,361 82,814 Cash and cash equivalents at end of the year 531,313 540,361 68,012 10,423

Organization and Basis of Pre_3

Organization and Basis of Presentation - Schedule of Organization and Basis of Presentation (Detail)	12 Months Ended
	Dec. 31, 2020
CN | Zhuhai Kingsoft Cloud Technology Co Ltd
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Place of establishment	PRC
Variable: Date of establishment/ acquisition	Nov. 9, 2012
Variable: Principal activities	Investment holding
CN | Kingsoft Cloud Beijing Information Technology Co Ltd
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Place of establishment	PRC
Variable: Date of establishment/ acquisition	Apr. 13, 2018
Variable: Principal activities	Investment holding
CN | Beijing Kingsoft Cloud Network Technology Co Ltd
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Place of establishment	PRC
Variable: Date of establishment/ acquisition	Nov. 9, 2012
Variable: Principal activities	Cloud services
CN | Beijing Jinxun Ruibo Network Technology Co Ltd
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Place of establishment	PRC
Variable: Date of establishment/ acquisition	Dec. 17, 2015
Variable: Principal activities	Cloud services
CN | Nanjing Qianyi Shixun Information Technology Co Ltd
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Place of establishment	PRC
Variable: Date of establishment/ acquisition	Mar. 31, 2016
Variable: Principal activities	Cloud services
Subsidiaries | Kingsoft Cloud Corporation Limited | HK
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Place of establishment	HK
Date of establishment/ acquisition	Feb. 1, 2012
Percentage of equity interest attributable to the Company	100.00%
Principal activities	Cloud services
Subsidiaries | Kingsoft Cloud Inc | US
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Place of establishment	U.S.
Date of establishment/ acquisition	Dec. 22, 2017
Percentage of equity interest attributable to the Company	100.00%
Principal activities	Cloud services
Subsidiaries | Wuhan Kingsoft Cloud Information Technology Co Ltd | CN
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Place of establishment	PRC
Date of establishment/ acquisition	Dec. 26, 2017
Percentage of equity interest attributable to the Company	100.00%
Principal activities	Cloud services
Subsidiaries | Beijing Kingsoft Cloud Technology Co., Ltd | CN
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Place of establishment	PRC
Date of establishment/ acquisition	Apr. 9, 2012
Percentage of equity interest attributable to the Company	100.00%
Principal activities	Research and development
Subsidiaries | Beijing Yunxiang Zhisheng Technology Co Ltd | CN
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Place of establishment	PRC
Date of establishment/ acquisition	Dec. 15, 2015
Percentage of equity interest attributable to the Company	100.00%
Principal activities	Research and development

Organization and Basis of Pre_4

Organization and Basis of Presentation - Additional Information (Detail) - CNY (¥) ¥ / shares in Units, ¥ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Shareholder Voting Rights Trust Agreements Term	10 years
Variable Interest Entity, Primary Beneficiary [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Assets of variable interest entity pledged	¥ 0
Assets of variable interest entity collateralised	¥ 0
Revenue Benchmark [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Concentration risk percentage	97.00%	98.10%	100.00%
Beijing Yunxiang Zhisheng Technology Co Ltd [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Payment towards loans to related parties		¥ 10,000
Loan To Zhuhai King Soft Cloud [Member] | Beijing Kingsoft Cloud Technology Co Ltd [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Payment towards loans to related parties		¥ 279
Exclusive Purchase Option Agreement With Zhuhai King Soft Cloud and Nominee Shareholders [Member] | Beijing Kingsoft Cloud Technology Co Ltd [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Equity Method investment per share purchase price	¥ 0.001
Exclusive Consultation and Technical Fees Agreement [Member] | Beijing Kingsoft Cloud Technology Co Ltd [Member] | Zhuhai Kingsoft Cloud [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Related party transaction term of agreement for consultancy services	20 years

Organization and Basis of Pre_5

Organization and Basis of Presentation - Schedule of Operations and Cash Flows Results of Variable Interest (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Revenues	¥ 6,577,307	$ 1,008,017	¥ 3,956,353	¥ 2,218,172
Net loss	(962,259)	(147,471)	(1,111,199)	(1,006,442)
Net cash used in operating activities	(290,433)	(44,511)	(439,132)	(383,110)
Net cash used in investing activities	(4,314,003)	(661,151)	883,247	(1,173,559)
Net cash generated from financing activities	6,124,153	938,568	64,507	2,435,832
Variable Interest Entity, Primary Beneficiary [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Revenues	6,377,158	977,342	3,882,352	2,218,172
Net loss	(922,908)	(141,442)	(970,344)	(872,291)
Net cash used in operating activities	(833,479)	(127,736)	(785,378)	(451,199)
Net cash used in investing activities	(1,471,637)	(225,538)	(836,981)	(990,734)
Net cash generated from financing activities	¥ 2,802,088	$ 429,439	¥ 1,618,102	¥ 1,838,484

Organization and Basis of Pre_6

Organization and Basis of Presentation - Schedule of Assets Liabilities Results of Variable Interest Entities (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2019USD ($)	Dec. 31, 2018CNY (¥)	Dec. 31, 2017CNY (¥)
Current assets:
Cash and Cash Equivalents, at Carrying Value	¥ 3,424,674	$ 524,854	¥ 2,023,263	$ 310,079	¥ 1,507,071	¥ 573,437
Accounts receivable, net	2,334,871	357,835	1,347,481
Prepayments and other assets	887,086	135,952	421,938
Total current assets	9,544,718	1,462,792	4,149,739
Non-current assets:
Property and equipment, net	1,956,790	299,891	1,720,974
Intangible assets, net	16,573	2,540	7,428
Prepayments and other assets	11,824	1,812	36,468
Equity investments	126,583	19,400	114,876
Operating lease right-of-use assets	266,968	40,915
Total non-current assets	2,384,496	365,440	1,882,082
Total assets	11,929,214	1,828,232	6,031,821
Current liabilities
Accounts payable	2,057,355	315,303	1,254,589
Long-term bank loan, current portion	74,351	11,395	100,000
Amounts due to related parties	112,998	17,318	104,259
Current operating lease liabilities	76,469	11,719
Total current liabilities	3,465,599	531,126	2,419,991
Non-current liabilities
Long-term bank loan			74,351
Deferred tax liabilities	29	4	206
Other liabilities	40,578	6,219
Non-current operating lease liabilities	182,958	28,040
Total non-current liabilities	223,565	34,263	74,557
Total liabilities	3,689,164	565,389	2,494,548
Variable Interest Entity, Primary Beneficiary [Member]
Current assets:
Cash and Cash Equivalents, at Carrying Value	1,429,508	219,082	751,103
Accounts receivable, net	2,258,313	346,102	1,317,110
Prepayments and other assets	630,121	96,570	385,402
Amounts due from related parties	204,275	31,306	106,368
Amounts due from subsidiaries of the Group	1,631,592	250,052	787,900
Total current assets	6,153,809	943,112	3,347,883
Non-current assets:
Property and equipment, net	1,727,620	264,769	1,465,338
Intangible assets, net	14,980	2,296	6,487
Prepayments and other assets	9,978	1,529	32,624
Equity investments	86,251	13,219	72,000
Amounts due from related parties	4,712	722	2,336
Operating lease right-of-use assets	210,338	32,236
Total non-current assets	2,053,879	314,771	1,578,785
Total assets	8,207,688	1,257,883	4,926,668
Current liabilities
Accounts payable	2,013,428	308,571	1,236,706
Accrued expenses and other liabilities	521,307	79,894	780,991
Short-term bank loans	278,488	42,680
Long-term bank loan, current portion	74,351	11,395	100,000
Income tax payable	45	7
Amounts due to related parties	56,795	8,704	50,472
Current operating lease liabilities	56,261	8,622
Amounts due to subsidiaries of the Group	903,879	138,526	1,010,663
Total current liabilities	3,904,554	598,399	3,178,832
Non-current liabilities
Long-term bank loan			74,351
Deferred tax liabilities	29	4	206
Other liabilities	7,020	1,076
Non-current operating lease liabilities	146,012	22,377
Amounts due to subsidiaries of the Group	7,367,267	1,129,084	4,244,727
Total non-current liabilities	7,520,328	1,152,541	4,319,284
Total liabilities	¥ 11,424,882	$ 1,750,940	¥ 7,498,116

Organization and Basis of Pre_7

Organization and Basis of Presentation - Schedule of Assets Liabilities Results of Variable Interest Entities (Parenthetical) (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2019USD ($)	Dec. 31, 2018CNY (¥)	Dec. 31, 2017CNY (¥)
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Allowanace for doubtful debt on accounts receivable current	¥ 15,770	$ 2,417	¥ 22,894	$ 3,509	¥ 2,249	¥ 2,183
Variable Interest Entity, Primary Beneficiary [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Allowanace for doubtful debt on accounts receivable current	¥ 15,745	$ 2,413	¥ 22,894

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Detail) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)¥ / shares	Dec. 31, 2020USD ($)$ / shares	Dec. 31, 2019CNY (¥)¥ / shares	Dec. 31, 2018CNY (¥)¥ / shares	Dec. 31, 2020USD ($)	Jan. 01, 2020CNY (¥)
Accounting Policies [Line Items]
Net income (loss)	¥ (962,259)	$ (147,471)	¥ (1,111,199)	¥ (1,006,442)
Net loss per share | (per share)	¥ (0.41)	$ (0.06)	¥ (1.31)	¥ (2.20)
Closing foreign exchange rate of CNY per US$1.00	6.5250				6.5250
Restricted cash and cash equivalents current	¥ 0		¥ 0	¥ 0
Equity securities measured at fair value using alternate measurement	126,583		114,876		$ 19,400
Equity securities without readily determinable fair value, upward price adjustment	14,301	$ 2,192	0
Equity securities without readily determinable fair value, downward price adjustment	0	0	0
Equity securities without readily determinable fair value cumulative loss	0		0		0
Impairment of long lived assets	0		0	0
Revenue from contract with customer, excluding assessed tax	6,577,307	1,008,017	3,956,353	2,218,172
Advertising expenses	15,348	2,352	29,271	23,030
Operating lease right-of-use assets	266,968				40,915
Operating lease liabilities	259,427				39,759
Operating lease liabilities current	76,469				11,719
Operating lease liabilities non current	182,958				28,040
Employee benefit expenses	126,784	19,430	155,848	¥ 114,305
Changes in Estimates of Useful Life [Member]
Accounting Policies [Line Items]
Depreciation expense	164,768	25,252
Net income (loss)	¥ 164,768	$ 25,252
Net loss per share | (per share)	¥ 0.07	$ 0.01
Accounting Standards Update 2016-02 [Member]
Accounting Policies [Line Items]
Operating lease right-of-use assets					14,152	¥ 92,339
Operating lease liabilities					$ 13,580	¥ 88,608
Enterprise Cloud Services Maintenance [Member]
Accounting Policies [Line Items]
Revenue from contract with customer, excluding assessed tax	¥ 4,145	$ 635	¥ 317
After the Use of Estimates [Member]
Accounting Policies [Line Items]
Electronic equipment estimated useful life	4 years	4 years

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Schedule of Property Plant and Equipment Useful Lives (Detail)	12 Months Ended
	Dec. 31, 2020
Electronic equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Electronic equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	4 years
Office Equipment and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Data center machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	10 years

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Schedule of Finite Lived Intangible Assets Useful Lives (Detail)	12 Months Ended
	Dec. 31, 2020
Domain names [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	10 years
Purchased software and copyrights [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	3 years
Purchased software and copyrights [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	10 years
Others [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	3 years

Concentration of Risks - Additi

Concentration of Risks - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Concentration of Risk [Line Items]
Percentage depreciation in foreign currency exchange rate	6.30%	1.30%
Accounts Receivable [Member] | Minimum [Member] | Two Customers [Member]
Concentration of Risk [Line Items]
Concentration risk percentage	10.00%	10.00%
Sales Revenue Net{Member] | Customer One [Member]
Concentration of Risk [Line Items]
Concentration risk percentage	10.00%	14.00%	25.00%
Sales Revenue Net{Member] | Customer Two [Member]
Concentration of Risk [Line Items]
Concentration risk percentage	28.00%	31.00%	24.00%
Sales Revenue Net{Member] | Customer Three [Member]
Concentration of Risk [Line Items]
Concentration risk percentage	15.00%	12.00%	11.00%

Revenues - Summary of Disaggreg

Revenues - Summary of Disaggregation of Revenue (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	¥ 6,577,307	$ 1,008,017	¥ 3,956,353	¥ 2,218,172
Public Cloud Services [Member] | Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	5,166,851	791,855	3,458,843	2,110,513
Enterprise Cloud Services Solutions [Member] | Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	1,368,544	209,739	485,991	94,369
Enterprise Cloud Services Maintenance [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	4,145	635	317
Enterprise Cloud Services Maintenance [Member] | Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	4,145	635	317
Enterprise Cloud Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	1,372,689	210,374	486,308	94,369
Product and Service, Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	37,767	5,788	11,202	13,290
Product and Service, Other [Member] | Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	36,611	5,611	¥ 11,202	¥ 13,290
Product and Service, Other [Member] | Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	¥ 1,156	$ 177

Revenues - Summary of Revenue,

Revenues - Summary of Revenue, Remaining Performance Obligation (Detail) - Dec. 31, 2020 ¥ in Thousands, $ in Thousands	CNY (¥)	USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue remaining performance obligation	¥ 13,158	$ 2,016
Within One Year [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue remaining performance obligation	8,582	1,315
More Than One Year [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue remaining performance obligation	¥ 4,576	$ 701

Revenues - Summary of Contract

Revenues - Summary of Contract with Customer Liability Recognized (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
Revenue Recognition and Deferred Revenue [Abstract]
Revenue recognized from amounts included in contract liabilities at the beginning of the period	¥ 37,550	$ 5,755	¥ 22,782	¥ 19,312

Accounts Receivable, Net - Sche

Accounts Receivable, Net - Schedule of Accounts Receivable, Net (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2019USD ($)	Dec. 31, 2018CNY (¥)	Dec. 31, 2017CNY (¥)
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable	¥ 2,350,641	$ 360,252	¥ 1,370,375
Allowance for doubtful accounts	(15,770)	(2,417)	(22,894)	$ (3,509)	¥ (2,249)	¥ (2,183)
Accounts receivable, net	¥ 2,334,871	$ 357,835	¥ 1,347,481

Accounts Receivable, Net - Sc_2

Accounts Receivable, Net - Schedule of the Movement in the allowance for Doubtful Accounts (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]
Balance at beginning of the year	¥ 22,894	$ 3,509	¥ 2,249	¥ 2,183
Additions (reversals)	(7,124)	(1,092)	20,645	66
Balance at end of the year	¥ 15,770	$ 2,417	¥ 22,894	¥ 2,249

Prepayments and Other Assets -

Prepayments and Other Assets - Schedule of Prepayments and Other Assets (Detail) ¥ in Thousands, $ in Thousands		Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
Current portion:
Prepayments to suppliers		¥ 78,621	$ 12,049	¥ 15,903
Contract costs		13,882	2,128	12,979
VAT prepayments		470,567	72,118	360,401
Interest receivable		14,204	2,177	3,114
Deferred IPO costs				11,971
Individual income tax receivable	[1]	231,377	35,460
Others		78,435	12,020	17,570
Total		887,086	135,952	421,938
Non-current portion:
Prepayments for electronic equipment		8,978	1,376	33,970
Others		2,846	436	2,498
Total		¥ 11,824	$ 1,812	¥ 36,468
[1]	Represents amounts due from certain employees related to their individual income taxes (“IIT”) arising from exercise and vesting of share-based awards.

Property and Equipment, Net - S

Property and Equipment, Net - Schedule of Property and Equipment, Net (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
Property, Plant and Equipment [Line Items]
Property and equipment, gross	¥ 4,314,665	$ 661,251	¥ 3,366,657
Less: accumulated depreciation	(2,357,875)	(361,360)	(1,645,683)
Property and equipment, net	1,956,790	299,891	1,720,974
Electronic Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,164,384	638,219	3,233,327
Office Equipment and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,759	1,496	1,444
Data Center Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	135,068	20,700	131,037
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	¥ 5,454	$ 836	¥ 849

Property and Equipment, Net - A

Property and Equipment, Net - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
Property, Plant and Equipment [Abstract]
Depreciation expense	¥ 750,375	$ 115,000	¥ 601,730	¥ 409,415

Intangible Assets, Net - Schedu

Intangible Assets, Net - Schedule of Intangible Assets, Net (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	¥ 35,296	$ 5,410	¥ 18,203
Less: accumulated amortization	(18,723)	(2,870)	(10,775)
Intangible assets, net	16,573	2,540	7,428
Domain Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	7,020	1,076	7,041
Less: accumulated amortization	(3,035)	(465)	(2,309)
Purchased Software and Copyrights [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	20,807	3,189	6,564
Less: accumulated amortization	(10,268)	(1,574)	(5,128)
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	7,469	1,145	4,598
Less: accumulated amortization	¥ (5,420)	$ (831)	¥ (3,338)

Intangible Assets, Net - Sche_2

Intangible Assets, Net - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2021	¥ 10,421	$ 1,597
2022	2,322	356
2023	1,350	207
2024	883	135
2025 and thereafter	1,597	245
Intangible assets, net	¥ 16,573	$ 2,540	¥ 7,428

Leases - Additional Information

Leases - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)
Leases [Abstract]
Weighted average remaining lease term for operating lease	9 years 8 months 12 days	9 years 8 months 12 days
Weighted average discount rate for operating lease	6.36%	6.36%
Operating lease cost	¥ 52,890	$ 8,106
Short-term lease cost	¥ 3,036	$ 465

Leases - Summary of Undiscounte

Leases - Summary of Undiscounted Future Minimum Payments under the Group's Operating Lease Liabilities (Detail) - Dec. 31, 2020 ¥ in Thousands, $ in Thousands	CNY (¥)	USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2021	¥ 79,495	$ 12,183
2022	51,151	7,839
2023	48,582	7,446
2024	49,123	7,528
2025 and thereafter	101,412	15,542
Total future lease payments	329,763	50,538
Less: imputed interest	(70,336)	(10,779)
Total lease liability balance	¥ 259,427	$ 39,759

Accrued Expenses and Other Li_3

Accrued Expenses and Other Liabilities - Schedule of Accrued Expenses and Other Liabilities (Detail) ¥ in Thousands, $ in Thousands		Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
Current portion:
Customer advances	[1]	¥ 191,357	$ 29,327	¥ 79,608
Salary and welfare payable		117,506	18,009	136,762
Purchase of property and equipment		181,038	27,745	609,363
Acquisition of equity investments				15,500
Accrued expenses		44,559	6,829	67,027
Other tax and surcharges payable		25,227	3,866	10,608
Deferred government grants		10,321	1,582	7,919
Individual income tax payable	[2]	231,377	35,460
Others	[3]	43,989	6,741	22,426
Accounts payable and accrued liabilities current		845,374	129,559	¥ 949,213
Non-current portion:
Deferred government grants		7,020	1,076
Others	[3]	33,558	5,143
Accounts payable and accrued liabilities noncurrent		¥ 40,578	$ 6,219
[1]	The amount represents contract liabilities for rendering of services. The increase in customer advances as compared to the year ended December 31, 2019 is a result of the increase in consideration received from the Group’s customers.
[2]	Represents IIT payable to the tax bureau on behalf of certain employees related to their exercise and vesting of share-based awards.
[3]	In July 2020, the Company received a reimbursement of US$7,469 (equivalent to RMB48,734) from the depository for the establishment and maintenance of the ADS program (“ADS Reimbursement”). As of December 31, 2020, RMB10,083 (US$1,545) and RMB33,558 (US$5,143) were included in the current portion and non-current portion of accrued expenses and other liabilities, respectively. The ADS Reimbursement will be released to the consolidated statements of comprehensive loss in equal amounts over the ADS program term.

Accrued Expenses and Other Li_4

Accrued Expenses and Other Liabilities - Schedule of Accrued Expenses and Other Liabilities (Parenthetical) (Detail) ¥ in Thousands, $ in Thousands		1 Months Ended
		Jul. 31, 2020CNY (¥)	Jul. 31, 2020USD ($)	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
Other accrued liabilities recorded as current	[1]			¥ 43,989	$ 6,741	¥ 22,426
Other accrued liabilities recorded as noncurrent	[1]			33,558	5,143
Other Current Liabilities [member]
Other accrued liabilities recorded as current				10,083	1,545
Other Noncurrent Liabilities [member]
Other accrued liabilities recorded as noncurrent				¥ 33,558	$ 5,143
ADS Reimbursement [member]
Reimbursement received from the depository for the establishment and maintenance of the ADS program		¥ 48,734	$ 7,469
[1]	In July 2020, the Company received a reimbursement of US$7,469 (equivalent to RMB48,734) from the depository for the establishment and maintenance of the ADS program (“ADS Reimbursement”). As of December 31, 2020, RMB10,083 (US$1,545) and RMB33,558 (US$5,143) were included in the current portion and non-current portion of accrued expenses and other liabilities, respectively. The ADS Reimbursement will be released to the consolidated statements of comprehensive loss in equal amounts over the ADS program term.

Bank Loans - Schedule of Bank L

Bank Loans - Schedule of Bank Loans (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
Schedule of Debt [Line Items]
Short-term bank loans	¥ 278,488	$ 42,680
Long-term third-party bank loan guaranteed by a related party:
Current portion	74,351	11,395	¥ 100,000
Non-current portion			74,351
Bank loan, total	¥ 352,839	$ 54,075	¥ 174,351

Bank Loans - Additional Informa

Bank Loans - Additional Information (Detail) ¥ in Thousands, $ in Thousands	Jun. 30, 2016CNY (¥)	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Aug. 31, 2020	Jun. 30, 2020	Dec. 31, 2019CNY (¥)
Schedule of Debt [Line Items]
Long term debt aggregate principal amount	¥ 400,000
Long term debt fixed annual interest rate	90.00%
Long term debt maturity date	Jun. 1, 2021
Long term debt term	5 years
Outstanding loan interest rate		4.30%	4.30%			4.30%
Long-term bank loan, current portion		¥ 74,351	$ 11,395			¥ 100,000
Short-term Debt, Weighted Average Interest Rate		4.28%	4.28%
Debt Instrument, Used Borrowing Capacity, Amount		¥ 335,137	$ 51,362
Beijing Banks at the Rate of 4.35% [Member]
Schedule of Debt [Line Items]
Short term debt fixed annual interest rate				4.35%	4.35%
Beijing Banks at the Rate of 2.85% [Member]
Schedule of Debt [Line Items]
Short term debt fixed annual interest rate				2.85%	2.85%
Beijing Banks at the Rate of 4.90% [Member]
Schedule of Debt [Line Items]
Short term debt fixed annual interest rate				4.90%	4.90%

Taxation - Additional Informati

Taxation - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2019USD ($)	Dec. 31, 2018	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Income Tax Disclosure [Line Items]
Interest and penalties uncertain tax position			¥ 0	$ 0	¥ 0	$ 0
Unrecognized tax benefits			¥ 12,613		¥ 0			$ 1,933
Maximum [Member]
Income Tax Disclosure [Line Items]
Tax years open for examination			5 years	5 years
Minimum [Member]
Income Tax Disclosure [Line Items]
Tax years open for examination			3 years	3 years
Tax Withholding on Payment of Interest and Dividends to Non PRC Resident Enterprises [Member]
Income Tax Disclosure [Line Items]
Tax withholding rates on interest and dividend payments			10.00%	10.00%	10.00%	10.00%	10.00%
Tax Year 2017 [Member] | Subsidiaries [Member]
Income Tax Disclosure [Line Items]
Open tax year			2017	2017
Tax Year 2020 [Member] | Subsidiaries [Member]
Income Tax Disclosure [Line Items]
Open tax year			2020	2020
HK
Income Tax Disclosure [Line Items]
Income tax rate			16.50%	16.50%	16.50%	16.50%	16.50%
Operating loss carryforwards			¥ 5,961,070					913,574
CN
Income Tax Disclosure [Line Items]
Income tax rate			25.00%	25.00%	25.00%	25.00%	25.00%
Operating loss carryforwards			¥ 5,961,070					$ 913,574
CN | Preferential Income Tax Rate [Member]
Income Tax Disclosure [Line Items]
Income tax rate			15.00%	15.00%
CN | Forecast [Member] | Preferential Income Tax Rate [Member]
Income Tax Disclosure [Line Items]
Income tax rate	15.00%	15.00%
CN | Beijing Kingsoft Cloud Technology Co., Ltd | Preferential Income Tax Rate [Member]
Income Tax Disclosure [Line Items]
Income tax rate			15.00%	15.00%	15.00%	15.00%	15.00%
CN | Beijing Kingsoft Cloud Network Technology Co Ltd | Preferential Income Tax Rate [Member]
Income Tax Disclosure [Line Items]
Income tax rate			15.00%	15.00%	15.00%	15.00%	15.00%

Taxation - Schedule of Income B

Taxation - Schedule of Income Before Income Tax, Domestic and Foreign (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
Income Tax Disclosure [Abstract]
PRC	¥ (1,095,015)	$ (167,817)	¥ (1,167,367)	¥ (1,055,676)
Non-PRC	147,721	22,639	65,171	58,866
Loss before income taxes	¥ (947,294)	$ (145,178)	¥ (1,102,196)	¥ (996,810)

Taxation - Schedule of Componen

Taxation - Schedule of Components of Income Tax Expense (Benefit) (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
Income Tax Disclosure [Abstract]
Current income tax expense	¥ 15,081	$ 2,311	¥ 9,180	¥ 9,809
Deferred income tax benefit	(177)	(27)	(177)	(177)
Income tax expense	¥ 14,904	$ 2,284	¥ 9,003	¥ 9,632

Taxation - Schedule of Effectiv

Taxation - Schedule of Effective Income Tax Rate Reconciliation (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
Income Tax Disclosure [Abstract]
Loss before income tax	¥ (947,294)	$ (145,178)	¥ (1,102,196)	¥ (996,810)
Income tax computed at the PRC statutory tax rate of 25%	(236,824)	(36,295)	(275,549)	(249,203)
Effect of tax holiday and preferential tax rates	(44,121)	(6,762)	11,493	(29,103)
Effect of different tax rates in different jurisdictions	10,580	1,621	(11,626)	(20,980)
Other non-taxable income	(35,454)	(5,434)	(21,557)	(4,018)
Non-deductible expenses	14,060	2,156	64,095	20,931
Share based compensation costs	82,528	12,648	30,320	11,794
Research and development super deduction	(113,388)	(17,377)	(94,401)	(75,787)
Withholding tax and others	11,581	1,775	9,180	9,809
Change in valuation allowance	399,756	61,265	259,031	369,257
True-up adjustments in respect of prior year's annual tax filling	(83,342)	(12,773)
Tax rate change on deferred items	9,528	1,460	38,017	(23,068)
Income tax expense	¥ 14,904	$ 2,284	¥ 9,003	¥ 9,632

Taxation - Schedule of Deferred

Taxation - Schedule of Deferred Tax Assets and Liabilities (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
Deferred tax assets:
Tax loss carry forward	¥ 1,454,702	$ 222,943	¥ 921,045
Accrued expenses	56,111	8,599	71,720
Depreciation	4,990	765	2,775
Allowance for doubtful accounts	3,156	484	2,925
Government grant	6,175	946	2,268
Operating lease liabilities	56,706	8,691
Accrued interest	66,609	10,208
Others			1,104
Less: valuation allowance	(1,401,416)	(214,776)	(1,001,837)
Deferred tax assets, net	247,033	37,860
Deferred tax liabilities:
Operating lease right-of-use assets	54,658	8,377
One-time deduction for fixed asset purchases	191,107	29,288
Long-lived assets arising from acquisition	29	4	206
Others	1,268	195
Deferred Tax Liabilities, Gross	¥ 247,062	$ 37,864	¥ 206

Taxation - Schedule of Deferr_2

Taxation - Schedule of Deferred Tax Assets and Liabilities (Parenthetical) (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
Income Tax Disclosure [Abstract]
Deferred tax assets gross	¥ 1,648,449	$ 252,636	¥ 1,001,837
Valuation allowance on deferred tax assets	¥ 1,401,416	$ 214,776	¥ 1,001,837

Taxation - Summary of Unrecogni

Taxation - Summary of Unrecognized Tax Benefit (Detail) - 12 months ended Dec. 31, 2020 ¥ in Thousands, $ in Thousands	CNY (¥)	USD ($)
Income Tax Uncertainties [Abstract]
Balance at beginning of the year	¥ 0
Additions based on tax positions related to current year	12,613	1,933
Balance at end of the year	¥ 12,613	$ 1,933

Convertible Preferred Shares _2

Convertible Preferred Shares and Redeemable Convertible Preferred Shares - Additional Information (Detail) $ / shares in Units, ¥ in Thousands, $ in Thousands	Jan. 08, 2020USD ($)$ / sharesshares	Dec. 30, 2019USD ($)shares	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)shares	Dec. 31, 2019CNY (¥)shares	Dec. 31, 2018CNY (¥)	Dec. 31, 2016USD ($)$ / shares	Dec. 31, 2015USD ($)$ / shares	Dec. 31, 2013USD ($)$ / shares	Dec. 31, 2018USD ($)$ / shares	Dec. 27, 2019$ / sharesshares	Jan. 01, 2019shares	Dec. 31, 2017$ / shares
Convertible Preferred Stock and Redeemable Convertible Preferred Stock [Line Items]
Proceeds from redeemable convertible preferred stock			¥ 124,730	$ 19,116	¥ 349,395	¥ 2,851,883
Preferred stock beneficial conversion price | $ / shares	$ 0.91
Fair value per ordinary share | $ / shares	$ 0.76
Preferred stock, liquidation preference, percentage of issue price			120.00%	120.00%
Minimum percentage of securities required for registration rights			30.00%	30.00%
Minimum period required for registration rights request			60 days	60 days
Minimum period after effective date required for other registration			90 days	90 days
Minimum sale price required for registrable securities | $				$ 2,000,000
Series A Convertible Preferred Shares [Member]
Convertible Preferred Stock and Redeemable Convertible Preferred Stock [Line Items]
Preferred stock, shares issued												458,116,000
Preferred stock, shares outstanding												458,116,000
Preferred stock sale or issue price per share | $ / shares								$ 0.07	$ 0.07
Proceeds from issue of convertible preferred stock | $								$ 34,000	$ 34,000
Series B Convertible Preferred Shares [Member]
Convertible Preferred Stock and Redeemable Convertible Preferred Stock [Line Items]
Temporary equity, shares issued												153,603,600
Temporary equity, shares outstanding												153,603,600
Temporary equity issue price per share | $ / shares								$ 0.36
Proceeds from redeemable convertible preferred stock | $								$ 54,988
Minimum pre-IPO market value required for redemption of preferred shares | $				1,512,500
Minimum proceeds required from IPO for redemption of preferred shares | $				$ 151,250
Series C Convertible Preferred Shares [Member]
Convertible Preferred Stock and Redeemable Convertible Preferred Stock [Line Items]
Temporary equity, shares issued				0	185,665,192							185,665,192
Temporary equity, shares outstanding				0	185,665,192							185,665,192
Temporary equity issue price per share | $ / shares							$ 0.59
Proceeds from redeemable convertible preferred stock | $							$ 108,903
Expiration date for completion of IPO			May 16, 2021	May 16, 2021
Series D Convertible Preferred Shares [Member]
Convertible Preferred Stock and Redeemable Convertible Preferred Stock [Line Items]
Temporary equity, shares issued				0	842,738,782							842,738,782
Temporary equity, shares outstanding				0	842,738,782							842,738,782
Temporary equity issue price per share | $ / shares										$ 0.88			$ 0.85
Proceeds from redeemable convertible preferred stock | $										$ 721,000
Series D and D+ Convertible Preferred Shares [Member]
Convertible Preferred Stock and Redeemable Convertible Preferred Stock [Line Items]
Minimum pre-IPO market value required for redemption of preferred shares | $				$ 3,000,000
Minimum proceeds required from IPO for redemption of preferred shares | $				$ 300,000
Series D+ Convertible Preferred Shares [Member]
Convertible Preferred Stock and Redeemable Convertible Preferred Stock [Line Items]
Temporary equity, shares issued				0	55,089,998
Temporary equity, shares outstanding				0	55,089,998
Temporary equity shares subscribed but not yet issued											77,125,997
Temporary equity issue price per share | $ / shares											$ 0.91
Proceeds from redeemable convertible preferred stock | $	$ 20,000	$ 50,000
Temporary equity shares issued during the period shares	22,035,999	55,089,998

Share-based Payments - Summary

Share-based Payments - Summary of the activity under the Share Option Scheme (Detail) - Share Options Scheme [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options - Outstanding	129,852,000
Number of options - Granted	12,387,915
Number of options - Forfeited	(5,696,000)
Number of options - Expired	(788,000)
Number of options - Exercised	(48,996,540)
Number of options - Outstanding	86,759,375	129,852,000
Number of options - Vested and expected	86,759,375
Number of options - Exercisable	36,603,460
Weighted- average exercise price - Outstanding	$ 0.07
Weighted- average exercise price - Granted	0.07
Weighted- average exercise price - Forfeited	0.07
Weighted- average exercise price - Expired	0.07
Weighted- average exercise price - Exercised	0.07
Weighted- average exercise price - Outstanding	0.07	$ 0.07
Weighted- average exercise price - Vested and expected	0.07
Weighted- average exercise price - Exercisable	0.07
Weighted- average grant- date fair value - Outstanding	0.37
Weighted- average grant- date fair value - Outstanding	0.54	$ 0.37
Weighted- average grant- date fair value - Vested and expected	0.54
Weighted- average grant- date fair value - Exercisable	$ 0.27
Weighted- average remaining contractual term - Outstanding	7 years 1 month 13 days	7 years 3 months 25 days
Weighted- average remaining contractual term - Vested and expected	7 years 1 month 13 days
Weighted- average remaining contractual term - Exercisable	5 years 7 months 20 days
Aggregate intrinsic value - Outstanding	$ 2.83
Aggregate intrinsic value - Vested and expected	2.83
Aggregate intrinsic value - Exercisable	$ 2.83

Share-based Payments - Addition

Share-based Payments - Additional Information (Detail) $ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)shares	Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2019CNY (¥)	Dec. 31, 2019$ / shares	Dec. 31, 2018CNY (¥)shares	Dec. 31, 2018$ / sharesshares	Dec. 31, 2020USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares, Number of shares Granted | shares					0
Restricted shares, total weighted average grant-date fair value granted | $ / shares		$ 0.78		$ 0.74
Restricted shares,Aggregate Fair value	¥ 91,683	$ 14,051	¥ 19,580
Share-based Payment Arrangement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based payment arrrangement intrinsic value of options excercised during the period	906,120	$ 138,869	308,665		¥ 0
Share based compensation by share based payment arrangement weighted average grant date fair value of awards granted during the period | $ / shares		$ 1.16		0.65		$ 0.58
Share based compensation by share based payment arrangement aggregatte fair value of shares vested during the period	44,135	$ 6,764	36,060		¥ 43,115
Share based compensation by share based payment arrangement unrecognised compensation	¥ 127,048						$ 19,471
Share based compensation by share based payment arrangement unrecognized compensation recognition period	1 year 6 months 14 days	1 year 6 months 14 days
Share Options Scheme [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based payment arrangement number of shares authorised | shares					209,750,000	209,750,000
Share based compensation by share based payment arrangement contactual term					10 years
Share based compensation by share based payment arrangement vesting period					2 years
Share based compensation by share based payment arrrangement intrinsic value of options excercised during the period	¥ 3,230	$ 495
Share based compensation by share based payment arrangement unrecognized compensation recognition period	1 year 8 months 1 day	1 year 8 months 1 day
Share based compensation by share based payment arrangement unrecognised compensation	¥ 132,797						20,352
Restricted shares, Number of shares Granted | shares	25,300,000	25,300,000
Restricted shares, total weighted average grant-date fair value granted | $ / shares		$ 0.78
Share Award Scheme [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based payment arrangement number of shares authorised | shares					215,376,304	215,376,304
Share based compensation by share based payment arrangement contactual term					10 years
Share based compensation by share based payment arrangement vesting period					5 years
Share based compensation by share based payment arrangement weighted average grant date fair value of awards granted during the period | $ / shares		$ 0.31		$ 0.30
Share based compensation by share based payment arrangement aggregatte fair value of shares vested during the period	¥ 15,981	$ 2,449	¥ 0
Share based compensation by share based payment arrangement unrecognized compensation recognition period	1 year 9 months 10 days	1 year 9 months 10 days
Share based compensation by share based payment arrangement unrecognised compensation	¥ 32,416						$ 4,968

Share-based Payments - Summar_2

Share-based Payments - Summary of the activity for the restricted shares issued under the Share Award Scheme (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares - Granted			0
Weighted-average grant date fair value - Granted	$ 0.78	$ 0.74
Share Options Scheme [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares - Outstanding	53,296,176
Number of shares - Granted	25,300,000
Number of shares - Vested	(21,470,416)
Number of shares - Forfeited	(3,523,200)
Number of shares - Outstanding	53,602,560	53,296,176
Number of shares - Expected to vest	53,602,560
Weighted-average grant date fair value - Outstanding	$ 0.70
Weighted-average grant date fair value - Granted	0.78
Weighted-average grant date fair value - Vested	0.65
Weighted-average grant date fair value - Forfeited	0.76
Weighted-average grant date fair value - Outstanding	0.76	$ 0.70
Weighted-average grant date fair value - Expected to vest	$ 0.76

Share-based Payments - Summar_3

Share-based Payments - Summary of the activity for the options issued under the Share Award Scheme (Detail) - Share Award Scheme [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options - Outstanding	19,556,800
Number of options - Granted	19,200,000
Number of options - Forfeited	(1,148,800)
Number of options - Exercised	(416,160)
Number of options - Outstanding	37,191,840	19,556,800
Number of options - Vested and expected	37,191,840
Number of options - Exercisable	7,376,800
Weighted- average exercise price - Outstanding	$ 0.87
Weighted- average exercise price - Granted	0.77
Weighted- average exercise price - Forfeited	0.87
Weighted- average exercise price - Exercised	0.87
Weighted- average exercise price - Outstanding	0.82	$ 0.87
Weighted- average exercise price - Vested and expected	0.82
Weighted- average exercise price - Exercisable	0.76
Weighted- average grant- date fair value - Outstanding	0.30
Weighted- average grant- date fair value - Outstanding	0.31	$ 0.30
Weighted- average grant date fair value - Vested and expected	0.31
Weighted- average grant- date fair value - Exercisable	$ 0.30
Weighted- average remaining contractual term - Outstanding	9 years	9 years 11 months 4 days
Weighted- average remaining contractual term - Vested and expected	9 years
Weighted- average remaining contractual term - Exercisable	9 years 18 days
Aggregate intrinsic value - Outstanding	$ 2.09
Aggregate intrinsic value - Vested and expected	2.09
Aggregate intrinsic value - Exercisable	$ 2.15

Share-based Payments - Summar_4

Share-based Payments - Summary of assumptions used to estimate the fair value of the share options (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 08, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free rate, Minimum	0.66%	1.58%	1.98%
Risk-free rate, Maximum	1.84%	1.80%	2.10%
Expected volatility range, Minimum	37.30%	37.40%	42.40%
Expected volatility range, Maximum	37.80%	37.90%	43.00%
Exercise multiple			2.20
Exercise multiple, Minimum	2.20	2.20
Exercise multiple, Maximum	2.80	2.80
Share Price				$ 0.76
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Price	$ 0.76	$ 0.72	$ 0.63
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Price	$ 1.94	$ 0.76	$ 0.68

Share-based Payments - Summar_5

Share-based Payments - Summary of share-based compensation expense (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018USD ($)
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Compensation Expense	¥ 330,114	$ 50,592	¥ 121,279	$ 46,941
Cost of revenues [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Compensation Expense	10,614	1,627	8,509	3,565
Selling and marketing expenses [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Compensation Expense	62,270	9,543	37,808	5,889
General and administrative expenses [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Compensation Expense	169,101	25,916	31,988	11,167
Research and development expenses [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Compensation Expense	¥ 88,129	$ 13,506	¥ 42,974	$ 26,320

Restricted Net Assets - Additio

Restricted Net Assets - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)
Restricted Assets Disclosure [Line Items]
Reserve Fund As a Percentage Of Registered Capital	50.00%	50.00%
Variable Interest Entities And Subsidaries [Member] | CHINA
Restricted Assets Disclosure [Line Items]
Restricted assets	¥ 4,848,975	$ 743,138
Minimum [Member] | Variable Interest Entity, Primary Beneficiary [Member] | CHINA
Restricted Assets Disclosure [Line Items]
Percentage Of Annual After Tax Profit To Be Allocated To Statutory Reserves	10.00%
Statutory Funds As A Percentage Of Registered Capital	50.00%
Minimum [Member] | Subsidiaries [Member] | CHINA
Restricted Assets Disclosure [Line Items]
Percentage Of Annual After Tax Profit to Be Allocated To Reserve Fund	10.00%
Percentage Of Annual After Tax Profit To Be Allocated To Statutory Reserves	10.00%
Statutory Funds As A Percentage Of Registered Capital	50.00%

Loss Per Share - Summary of Ear

Loss Per Share - Summary of Earnings Per Share Basic and Diluted (Detail) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)¥ / sharesshares	Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2019CNY (¥)¥ / sharesshares	Dec. 31, 2018CNY (¥)¥ / sharesshares
Numerator:
Net loss attributable to Kingsoft Cloud Holdings Limited	¥ (962,259)	$ (147,471)	¥ (1,111,199)	¥ (1,006,442)
Accretion to redemption value of redeemable convertible preferred shares	(19,768)	(3,030)	(49,725)	(742,472)
Net loss attributable to ordinary shareholders	¥ (982,027)	$ (150,501)	¥ (1,160,924)	¥ (1,748,914)
Denominator:
Weighted average number of ordinary shares outstanding - basic and diluted	2,400,874,197	2,400,874,197	889,521,200	793,430,000
Basic and diluted loss per share | (per share)	¥ (0.41)	$ (0.06)	¥ (1.31)	¥ (2.20)

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail)

Sep. 23, 2020CNY (¥)shares

Sep. 23, 2020USD ($)$ / sharesshares

Feb. 29, 2020$ / sharesshares

Jan. 08, 2020CNY (¥)shares

Jan. 08, 2020USD ($)$ / sharesshares

Dec. 31, 2020CNY (¥)shares

Dec. 31, 2020USD ($)$ / sharesshares

Apr. 07, 2020$ / sharesshares

Dec. 31, 2019$ / sharesshares

Class of Stock [Line Items]

Fair value per ordinary share | $ / shares

$ 0.76

Shares repurchased during the period value | ¥

¥ 26,700,000

Common Stock, Par or Stated Value Per Share | $ / shares

$ 0.001

$ 0.001

Common stock shares authorised

4,000,000,000

1,282,750,429

NASDAQ/NGS (GLOBAL SELECT MARKET) [Member]

Class of Stock [Line Items]

Sale of stock consideration received in the transaction

¥ 1,881,233

$ 288,312

Common Stock [Member]

Class of Stock [Line Items]

Shares repurchased during the period shares

[1]

5,475,254

5,475,254

Shares repurchased during the period value | ¥

¥ 38,000

Revision In Authorised Capital [Member]

Class of Stock [Line Items]

Common stock preferred stock and temporary equity shares authorised

4,000,000,000

Common Stock, Par or Stated Value Per Share | $ / shares

$ 0.001

Common stock shares authorised

2,282,750,429

IPO [Member]

Class of Stock [Line Items]

Stock shares issued during the period shares

30,000,000

30,000,000

Sale of stock issue price per share | $ / shares

$ 1.13

Sale of stock consideration received in the transaction

¥ 3,875,394

$ 593,930

Number of shares of preferred stock converted into common stock

1,717,249,571

IPO [Member] | Common Stock [Member]

Class of Stock [Line Items]

Stock shares issued during the period shares

450,000,000

450,000,000

517,500,000

[1]

517,500,000

[1]

Sale of stock issue price per share | $ / shares

$ 17

Over-Allotment Option [Member]

Class of Stock [Line Items]

Stock shares issued during the period shares

4,500,000

4,500,000

Over-Allotment Option [Member] | NASDAQ/NGS (GLOBAL SELECT MARKET) [Member]

Class of Stock [Line Items]

Stock shares issued during the period shares

1,250,000

1,250,000

Over-Allotment Option [Member] | Common Stock [Member]

Class of Stock [Line Items]

Stock shares issued during the period shares

67,500,000

67,500,000

Over-Allotment Option [Member] | Common Stock [Member] | NASDAQ/NGS (GLOBAL SELECT MARKET) [Member]

Class of Stock [Line Items]

Stock shares issued during the period shares

18,750,000

18,750,000

Follow On Offer [Member] | NASDAQ/NGS (GLOBAL SELECT MARKET) [Member]

Class of Stock [Line Items]

Stock shares issued during the period shares

120,000,000

120,000,000

Sale of stock issue price per share | $ / shares

$ 2.07

Follow On Offer [Member] | Common Stock [Member] | NASDAQ/NGS (GLOBAL SELECT MARKET) [Member]

Class of Stock [Line Items]

Stock shares issued during the period shares

8,000,000

8,000,000

Sale of stock issue price per share | $ / shares

$ 31

Series A Convertible Preferred Shares [Member] | Revision In Authorised Capital [Member]

Class of Stock [Line Items]

Preferred stock shares authorised

458,116,000

Series B Convertible Redeemable Preferred Shares [Member]

Class of Stock [Line Items]

Temporary equity shares authorised

0

153,603,600

Series B Convertible Redeemable Preferred Shares [Member] | Revision In Authorised Capital [Member]

Class of Stock [Line Items]

Temporary equity shares authorised

153,603,600

Series C Redeemable Convertible Preferred Shares [Member]

Class of Stock [Line Items]

Temporary equity shares authorised

0

185,665,192

Series C Redeemable Convertible Preferred Shares [Member] | Revision In Authorised Capital [Member]

Class of Stock [Line Items]

Temporary equity shares authorised

185,665,192

Series D Redeemable Convertible Preferred Shares [Member]

Class of Stock [Line Items]

Temporary equity shares authorised

0

842,738,782

Series D Redeemable Convertible Preferred Shares [Member] | Revision In Authorised Capital [Member]

Class of Stock [Line Items]

Temporary equity shares authorised

842,738,782

Series D Plus Redeemable Convertible Preferred Shares [Member]

Class of Stock [Line Items]

Temporary equity shares authorised

0

77,125,997

Series D Plus Redeemable Convertible Preferred Shares [Member] | Revision In Authorised Capital [Member]

Class of Stock [Line Items]

Temporary equity shares authorised

77,125,997

Executive Officer [Member]

Class of Stock [Line Items]

Repurchase price per share | $ / shares

$ 0.70

Shares repurchased during the period shares

5,475,254

Shares repurchased during the period value | $

$ 0

[1]

As of December 31, 2019 and 2020, 182,375,104 and 206,506,322 ordinary shares, respectively, were held by share based payment vehicles in relation to the share awards. These shares are legally issued but not outstanding.

Related Party Transactions - Sc

Related Party Transactions - Schedule Of Related Parties And Nature Of Relationship (Detail)	12 Months Ended
	Dec. 31, 2020
Kingsoft Group [Member]
Related Party Transaction [Line Items]
Nature of Common Ownership or Management Control Relationships	Principal shareholder of the Company
Cheetah Group [Member]
Related Party Transaction [Line Items]
Nature of Common Ownership or Management Control Relationships	Entity that Kingsoft Corporation Limited exercises significant influence over
Xiaomi Group [Member]
Related Party Transaction [Line Items]
Nature of Common Ownership or Management Control Relationships	Entity controlled by a director of the Company

Related Party Transactions - _2

Related Party Transactions - Schedule Of Related Party Transactions (Detail) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
Related Party Transaction [Line Items]
Revenue from Related Parties	¥ 777,369	$ 119,137,000	¥ 688,307	¥ 630,511
Related Party Transaction, Amounts of Transaction	63,878	9,790	41,734	65,292
Public cloud services [Member] | Kingsoft Group [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	119,011	18,239,000	109,177	77,732
Public cloud services [Member] | Cheetah Group [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	3,111	477,000	8,579	6,202
Public cloud services [Member] | Xiaomi Group [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	655,165	100,408,000	570,431	546,577
Other Services [Member] | Xiaomi Group [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	82	13,000	120
Purchase of services [Member] | Xiaomi Group [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	2,177	334	2,707	18,868
Interest expense on loan [Member] | Kingsoft Group [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction			4,925	25,111
Rental of office space and administrative services [Member] | Kingsoft Group [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	13,801	2,115	24,524	¥ 21,313
Rental of office space and administrative services [Member] | Xiaomi Group [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	¥ 47,900	$ 7,341	¥ 9,578

Related Party Transactions - _3

Related Party Transactions - Schedule Of Related Party Transactions (Parenthetical) (Detail) - Dec. 31, 2020 ¥ in Thousands, $ in Thousands	CNY (¥)	USD ($)
Related Party Transaction [Line Items]
Operating lease right-of-use assets	¥ 266,968	$ 40,915
Operating lease liabilities	259,427	39,759
Xiaomi Group [Member]
Related Party Transaction [Line Items]
Operating lease right-of-use assets	243,585	37,331
Operating lease liabilities	¥ 250,646	$ 38,413

Related Party Transactions - _4

Related Party Transactions - Schedule Of Related Party Balances (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
Amounts due from related parties:
Amounts due from related parties	¥ 210,826	$ 32,310	¥ 133,968
Amounts due to related parties:
Amounts due to related parties	112,998	17,318	104,259
Kingsoft Group [Member]
Amounts due from related parties:
Amounts due from related parties	45,258	6,936	43,716
Amounts due to related parties:
Amounts due to related parties	80,294	12,306	81,909
Cheetah Group [Member]
Amounts due from related parties:
Amounts due from related parties			1,932
Xiaomi Group [Member]
Amounts due from related parties:
Amounts due from related parties	165,568	25,374	63,859
Amounts due to related parties:
Amounts due to related parties	¥ 32,704	$ 5,012	22,350
Senior Executives [Member]
Amounts due from related parties:
Amounts due from related parties			¥ 24,461

Related Party Transactions - _5

Related Party Transactions - Schedule Of Related Party Balances (Parenthetical) (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
Senior Executives [Member]
Related Party Transaction [Line Items]
Interest income	¥ 175	$ 27	¥ 982

Commitments and contingencies -

Commitments and contingencies - Additional Information (Detail) - Dec. 31, 2020 ¥ in Thousands, $ in Thousands	CNY (¥)	USD ($)
Commitments and Contingencies Disclosure [Abstract]
Capital expenditure commitments	¥ 110,813	$ 16,983

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (loss) -Schedule Of Accumulated Other Comprehensive Income (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
Schedule Of Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	¥ 484,348		¥ 419,750
Foreign currency translation adjustments	(552,788)	$ (84,718)	64,598	¥ 401,820
Ending Balance	¥ (68,440)	$ (10,489)	¥ 484,348	¥ 419,750

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (loss) - Additional Information (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments tax	¥ 0	¥ 0

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - Subsequent Event [member]	Mar. 31, 2021
Target company [member]
Subsequent Event [Line Items]
Percentage of equity interest acquired	100.00%
Another Target company [member] | Investment Agreement [member]
Subsequent Event [Line Items]
Percentage of equity interest acquired	60.00%

Condensed Financial Informati_3

Condensed Financial Information of the Parent Company - Summary of Parent Company Balance Sheet (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2019USD ($)	Dec. 31, 2018CNY (¥)	Dec. 31, 2017CNY (¥)
Current assets:
Cash and cash equivalents	¥ 3,424,674	$ 524,854	¥ 2,023,263	$ 310,079	¥ 1,507,071	¥ 573,437
Short-term investments	2,693,019	412,723	225,425
Prepayments and other assets	887,086	135,952	421,938
Total current assets	9,544,718	1,462,792	4,149,739
Total assets	11,929,214	1,828,232	6,031,821
Current liabilities:
Income tax payable	20,564	3,152	11,930
Total current liabilities	3,465,599	531,126	2,419,991
Other liabilities	40,578	6,219
Total non-current liabilities	223,565	34,263	74,557
Total liabilities	3,689,164	565,389	2,494,548
Mezzanine equity:
Total mezzanine equity			7,734,532
Shareholders' (deficit) equity:
Series A convertible preferred shares			123,186
Ordinary shares	22,801	3,494	5,558
Additional paid-in capital	14,149,984	2,168,580	91,746
Accumulated deficit	(5,864,356)	(898,751)	(4,902,097)
Accumulated other comprehensive income	(68,440)	(10,489)	484,348		419,750
Total (deficit) equity	8,240,050	1,262,843	(4,197,259)		(3,243,111)	(1,942,958)
Total liabilities, mezzanine equity and shareholders' (deficit) equity	11,929,214	1,828,232	6,031,821
Series B Convertible Preferred Shares [Member]
Mezzanine equity:
Series redeemable convertible preferred shares			337,268
Series C Redeemable Convertible Preferred Shares [Member]
Mezzanine equity:
Series redeemable convertible preferred shares			1,043,147
Series D Redeemable Convertible Preferred Shares [Member]
Mezzanine equity:
Series redeemable convertible preferred shares			5,965,273
Series D+ Redeemable Convertible Preferred Shares [Member]
Mezzanine equity:
Series redeemable convertible preferred shares			388,844
Parent Company [Member]
Current assets:
Cash and cash equivalents	68,012	10,423	540,361	$ 82,814	¥ 531,313	¥ 1,849
Short-term investments	217,448	33,325
Prepayments and other assets	266,280	40,809	31,132
Amounts due from subsidiaries	7,983,060	1,223,458	2,974,463
Amounts due from related parties			24,061
Total current assets	8,534,800	1,308,015	3,570,017
Total assets	8,534,800	1,308,015	3,570,017
Current liabilities:
Accrued expenses and other liabilities	256,630	39,330	30,188
Income tax payable	2,524	387	2,514
Amounts due to subsidiaries	1,692	259	7
Amounts due to related parties	407	62	35
Total current liabilities	261,253	40,038	32,744
Other liabilities	33,558	5,143
Total non-current liabilities	33,558	5,143
Total liabilities	294,811	45,181	32,744
Mezzanine equity:
Total mezzanine equity			7,734,532
Shareholders' (deficit) equity:
Series A convertible preferred shares			123,186
Ordinary shares	22,801	3,494	5,558
Additional paid-in capital	14,149,984	2,168,580	91,746
Accumulated deficit	(5,864,356)	(898,751)	(4,902,097)
Accumulated other comprehensive income	(68,440)	(10,489)	484,348
Total (deficit) equity	8,239,989	1,262,834	(4,197,259)
Total liabilities, mezzanine equity and shareholders' (deficit) equity	¥ 8,534,800	$ 1,308,015	3,570,017
Parent Company [Member] | Series B Convertible Preferred Shares [Member]
Mezzanine equity:
Series redeemable convertible preferred shares			337,268
Parent Company [Member] | Series C Redeemable Convertible Preferred Shares [Member]
Mezzanine equity:
Series redeemable convertible preferred shares			1,043,147
Parent Company [Member] | Series D Redeemable Convertible Preferred Shares [Member]
Mezzanine equity:
Series redeemable convertible preferred shares			5,965,273
Parent Company [Member] | Series D+ Redeemable Convertible Preferred Shares [Member]
Mezzanine equity:
Series redeemable convertible preferred shares			¥ 388,844

Condensed Financial Informati_4

Condensed Financial Information of the Parent Company - Summary of Parent Company Balance Sheet Disclosure (Parenthetical) (Detail) - $ / shares	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Common stock, par or stated value per share	$ 0.001	$ 0.001
Common stock shares authorised	4,000,000,000	1,282,750,429
Common stock, shares, issued	3,546,124,955	1,077,086,304
Common stock, shares, outstanding	3,339,618,633	894,711,200
Parent Company [Member]
Common stock, par or stated value per share	$ 0.001	$ 0.001
Common stock shares authorised	4,000,000,000	1,282,750,429
Common stock, shares, issued	3,546,124,955	1,077,086,304
Common stock, shares, outstanding	3,339,618,633	894,711,200
Series A Convertible Preferred Shares [Member]
Preferred stock, shares issued			458,116,000
Preferred stock, shares outstanding			458,116,000
Series A Convertible Preferred Shares [Member] | Parent Company [Member]
Preferred stock, par or stated value per share	$ 0.001
Preferred stock shares authorised	0	458,116,000
Preferred stock, shares issued	0	458,116,000
Preferred stock, shares outstanding	0	458,116,000
Series B Convertible Preferred Shares [Member]
Temporary equity, shares issued			153,603,600
Temporary equity, shares outstanding			153,603,600
Series B Convertible Preferred Shares [Member] | Parent Company [Member]
Temporary equity, par or stated value per share	$ 0.001	$ 0.001
Temporary equity shares authorised	0	153,603,600
Temporary equity, shares issued	0	153,603,600
Temporary equity, shares outstanding	0	153,603,600
Series C Redeemable Convertible Preferred Shares [Member]
Temporary equity, par or stated value per share	$ 0.001	$ 0.001
Temporary equity shares authorised	0	185,665,192
Temporary equity, shares issued	0	185,665,192	185,665,192
Temporary equity, shares outstanding	0	185,665,192	185,665,192
Series C Redeemable Convertible Preferred Shares [Member] | Parent Company [Member]
Temporary equity, par or stated value per share	$ 0.001	$ 0.001
Temporary equity shares authorised	0	185,665,192
Temporary equity, shares issued	0	185,665,192
Temporary equity, shares outstanding	0	185,665,192
Series D Redeemable Convertible Preferred Shares [Member]
Temporary equity, par or stated value per share	$ 0.001	$ 0.001
Temporary equity shares authorised	0	842,738,782
Temporary equity, shares issued	0	842,738,782	842,738,782
Temporary equity, shares outstanding	0	842,738,782	842,738,782
Series D Redeemable Convertible Preferred Shares [Member] | Parent Company [Member]
Temporary equity, par or stated value per share	$ 0.001	$ 0.001
Temporary equity shares authorised	0	842,738,782
Temporary equity, shares issued	0	842,738,782
Temporary equity, shares outstanding	0	842,738,782
Series D+ Redeemable Convertible Preferred Shares [Member]
Temporary equity, par or stated value per share	$ 0.001	$ 0.001
Temporary equity shares authorised	0	77,125,997
Temporary equity, shares issued	0	55,089,998
Temporary equity, shares outstanding	0	55,089,998
Series D+ Redeemable Convertible Preferred Shares [Member] | Parent Company [Member]
Temporary equity, par or stated value per share	$ 0.001	$ 0.001
Temporary equity shares authorised	0	77,125,997
Temporary equity, shares issued	0	55,089,998
Temporary equity, shares outstanding	0	55,089,998

Condensed Financial Informati_5

Condensed Financial Information of the Parent Company - Summary of Parent Company Income Statement (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
Operating expenses:
General and administrative expenses	¥ (379,892)	$ (58,221)	¥ (238,648)	¥ (146,846)
Total operating expenses	(1,564,233)	(239,729)	(1,151,243)	(779,035)
Interest income	77,118	11,819	78,612	116,500
Foreign exchange (loss) gain	188,800	28,935	(38,961)	(102,202)
Other (expenses) income, net	(10,810)	(1,657)	6,612	739
Changes in fair value of financial instruments	14,301	2,192		6,404
Loss before income taxes	(947,294)	(145,178)	(1,102,196)	(996,810)
Income tax expense	(14,904)	(2,284)	(9,003)	(9,632)
Net loss attributable to Kingsoft Cloud Holdings Limited	(962,259)	(147,471)	(1,111,199)	(1,006,442)
Other comprehensive income (loss), net of tax of nil:
Comprehensive loss attributable to Kingsoft Cloud Holdings Limited shareholders	(1,515,047)	(232,189)	(1,046,601)	(604,622)
Accretion to redemption value of redeemable convertible preferred shares	(19,768)	(3,030)	(49,725)	(742,472)
Comprehensive loss attributable to ordinary shareholders	(1,534,815)	(235,219)	(1,096,326)	(1,347,094)
Parent Company [Member]
Operating expenses:
General and administrative expenses	(27,052)	(4,146)	(6,734)	(795)
Total operating expenses	(27,052)	(4,146)	(6,734)	(795)
Interest income	10,199	1,563	52,829	112,477
Foreign exchange (loss) gain	30,931	4,740	(8,174)	(22,652)
Other (expenses) income, net	5,377	824	(300)	(301)
Changes in fair value of financial instruments				6,404
Share of losses of subsidiaries and the VIEs	(981,093)	(150,357)	(1,145,405)	(1,094,583)
Loss before income taxes	(961,638)	(147,376)	(1,107,784)	(999,450)
Income tax expense	(621)	(95)	(3,415)	(6,992)
Net loss attributable to Kingsoft Cloud Holdings Limited	(962,259)	(147,471)	(1,111,199)	(1,006,442)
Other comprehensive income (loss), net of tax of nil:
Foreign currency translation adjustments	(552,788)	(84,718)	64,598	401,820
Comprehensive loss attributable to Kingsoft Cloud Holdings Limited shareholders	(1,515,047)	(232,189)	(1,046,601)	(604,622)
Accretion to redemption value of redeemable convertible preferred shares	(19,768)	(3,030)	(49,725)	(742,472)
Comprehensive loss attributable to ordinary shareholders	¥ (1,534,815)	$ (235,219)	¥ (1,096,326)	¥ (1,347,094)

Condensed Financial Informati_6

Condensed Financial Information of the Parent Company - Summary of Parent Company Cash Flow (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
Net cash used in operating activities	¥ (290,433)	$ (44,511)	¥ (439,132)	¥ (383,110)
Net cash (used in) generated from investing activities	(4,314,003)	(661,151)	883,247	(1,173,559)
Net cash generated from financing activities	6,124,153	938,568	64,507	2,435,832
Effect of exchange rate changes on cash and cash equivalents	(118,306)	(18,131)	7,570	54,471
Net increase in cash and cash equivalents	1,519,717	232,906	508,622	879,163
Cash and cash equivalents at beginning of year	2,023,263	310,079	1,507,071	573,437
Cash and cash equivalents at end of year	3,424,674	524,854	2,023,263	1,507,071
Parent Company [Member]
Net cash used in operating activities	(6,203,310)	(950,699)	(2,538,479)	(2,396,432)
Net cash (used in) generated from investing activities	(218,674)	(33,513)	2,166,312	(62,213)
Net cash generated from financing activities	5,945,666	911,214	370,294	2,851,882
Effect of exchange rate changes on cash and cash equivalents	3,969	607	10,921	136,227
Net increase in cash and cash equivalents	(472,349)	(72,391)	9,048	529,464
Cash and cash equivalents at beginning of year	540,361	82,814	531,313	1,849
Cash and cash equivalents at end of year	¥ 68,012	$ 10,423	¥ 540,361	¥ 531,313