CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income Adjustment for the adoption of ASU 2016-01	Accumulated Deficit	Accumulated Deficit Adjustment for the adoption of ASU 2016-01
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)		74,263,000
Beginning balance (in shares) at Dec. 31, 2018	142,662,000
Beginning balance at Dec. 31, 2018	$ 631,413
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of Series H redeemable convertible, preferred stock, net issuance costs of $181 (in shares)	11,276,000
Issuance of Series H redeemable convertible, preferred stock, net issuance costs of $181	$ 149,820
Sale of redeemable convertible preferred stock (Note 11) (in shares)	7,517,000
Sale of redeemable convertible preferred stock (Note 11)	$ 59,929
Repurchase of redeemable convertible preferred stock (Note 11) (in shares)	(7,517,000)
Repurchase of redeemable convertible preferred stock (Note 11)	$ (59,929)
Accretion of redeemable convertible preferred	$ 553,339
Ending balance (in shares) at Dec. 31, 2019	153,938,000
Ending balance at Dec. 31, 2019	$ 1,334,572
Beginning balance at Dec. 31, 2018	(539,198)	$ 1	$ 0	$ 1,141	$ (981)	$ (540,340)	$ 981
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Deemed contribution (Note 11)	40,071					40,071
Accretion of redeemable convertible preferred stock	(553,339)		(962)			(552,377)
Deemed dividend distribution	(40,071)					(40,071)
Issuance of common stock upon exercise of stock options (in shares)		2,558,000
Issuance of common stock upon exercise of stock options	689		689
Stock-based compensation	273		273
Unrealized (loss) gain on marketable securities	(21)			(21)
Net loss	(31,125)					(31,125)
Ending balance (in shares) at Dec. 31, 2019		76,821,000
Ending balance at Dec. 31, 2019	$ (1,122,721)	$ 1	0	139		(1,122,861)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2018-02 [Member]
Beginning balance (in shares)		76,821,000
Accretion of redeemable convertible preferred	$ 1,560,524
Ending balance (in shares) at Dec. 31, 2020	153,937,730
Ending balance at Dec. 31, 2020	$ 2,895,096
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accretion of redeemable convertible preferred stock	(1,560,524)		(43,526)			(1,516,998)
Deemed dividend distribution	0
Issuance of common stock upon exercise of stock options (in shares)		798,000
Issuance of common stock upon exercise of stock options	246		246
Stock-based compensation	43,280		43,280
Unrealized (loss) gain on marketable securities	272			272
Net loss	(57,294)					(57,294)
Ending balance (in shares) at Dec. 31, 2020		77,619,000
Ending balance at Dec. 31, 2020	(2,696,741)	$ 1	0	411		(2,697,153)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)		77,619,000
Accretion of redeemable convertible preferred	$ 2,646,662
Conversion of convertible securities (in shares)	(153,938,000)
Conversion of redeemable convertible preferred stock into common stock upon initial public offering	$ (5,541,758)
Ending balance (in shares) at Dec. 31, 2021	0
Ending balance at Dec. 31, 2021	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accretion of redeemable convertible preferred stock	(2,646,662)		(2,264,869)			(381,793)
Deemed dividend distribution	0
Conversion of redeemable convertible preferred stock into common stock upon initial public offering (in shares)		153,938,000
Conversion of redeemable convertible preferred stock into common stock upon initial public offering	5,541,758	$ 2	5,541,756
Issuance of common stock upon initial public offering, net of underwriting discount and offering expenses (in shares)		31,350,000
Issuance of common stock upon initial public offering, net of underwriting discount and offering expenses	$ 1,062,058		1,062,058
Issuance of common stock upon exercise of stock options (in shares)	537,000	537,000
Issuance of common stock upon exercise of stock options	$ 94		94
Vesting of restricted stock units (in shares)		9,850,000
Vesting of restricted stock units	(3,343)		(3,343)
Stock-based compensation	174,028		174,028
Unrealized (loss) gain on marketable securities	(1,158)			(1,158)
Net loss	(191,995)					(191,995)
Ending balance (in shares) at Dec. 31, 2021		273,294,000
Ending balance at Dec. 31, 2021	$ 1,238,039	$ 3	$ 4,509,724	$ (747)		$ (3,270,941)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)		273,294,000