Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Adjustments for prior periods from adopting ASC 842	Redeemable convertible preferred stock	Series E Redeemable Convertible Preferred Stock	Series E-2 Redeemable Convertible Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Accumulated Deficit Adjustments for prior periods from adopting ASC 842
Beginning Balance (in shares) at Dec. 31, 2020			102,074,703
Beginning Balance at Dec. 31, 2020			$ 664,791
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of redeemable convertible preferred stock, net of issuance costs (in shares)				4,650,999
Issuance of redeemable convertible preferred stock, net of issuance costs				$ 61,631
Issuance of redeemable convertible preferred stock from the exercise of warrants (in shares)				9,477,073	4,331,644
Issuance of redeemable convertible preferred stock from the exercise of warrants				$ 379,084	$ 173,275
Accretion of redeemable convertible preferred stock to redemption value			$ 4,135
Ending Balance (in shares) at Mar. 31, 2021			120,534,419
Ending Balance at Mar. 31, 2021			$ 1,282,916
Beginning Balance (in shares) at Dec. 31, 2020						60,543,337
Beginning Balance at Dec. 31, 2020	$ (405,473)					$ 6	$ 0	$ (301)	$ (405,178)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from exercise of options (in shares)						60,616
Issuance of common stock from exercise of options	$ 1						1
Issuance of common stock under the Employee Stock Purchase Plan (in shares)	0
Vesting of early exercised stock options	$ 21						21
Accretion of redeemable convertible preferred stock to redemption value	(4,135)						(4,135)
Stock-based compensation	6,289						6,289
Foreign currency translation adjustment	911							911
Net loss	(385,160)								(385,160)
Ending Balance (in shares) at Mar. 31, 2021						60,603,953
Ending Balance at Mar. 31, 2021	(787,546)					$ 6	2,176	610	(790,338)
Beginning Balance (in shares) at Dec. 31, 2020			102,074,703
Beginning Balance at Dec. 31, 2020			$ 664,791
Beginning Balance (in shares) at Dec. 31, 2020						60,543,337
Beginning Balance at Dec. 31, 2020	$ (405,473)					$ 6	0	(301)	(405,178)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2016-02 [Member]
Ending Balance (in shares) at Dec. 31, 2021						221,833,195
Ending Balance at Dec. 31, 2021	$ 1,326,978	$ 191				$ 22	2,464,730	77	(1,137,851)	$ 191
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from exercise of options (in shares)						534,019
Issuance of common stock from exercise of options	$ 871						871
Issuance of common stock related to release of RSU and SVAs (in shares)						537,980
Issuance of common stock under the Employee Stock Purchase Plan (in shares)	87,215					87,215
Issuance of common stock under the Employee Stock Purchase Plan	$ 1,292						1,292
Vesting of early exercised stock options	21						21
Stock-based compensation	27,527						27,527
Foreign currency translation adjustment	199							199
Net loss	(111,903)								(111,903)
Ending Balance (in shares) at Mar. 31, 2022						222,992,409
Ending Balance at Mar. 31, 2022	$ 1,245,176					$ 22	$ 2,494,441	$ 276	$ (1,249,563)