Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Convertible preferred stock	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2020		194,474,000
Beginning balance at Dec. 31, 2020		$ 1,010,968
Ending balance (in shares) at Mar. 31, 2021		194,474,000
Ending balance at Mar. 31, 2021		$ 1,010,968
Beginning balance (in shares) at Dec. 31, 2020			15,570,000
Beginning balance at Dec. 31, 2020	$ (292,528)		$ 2	$ 41,357	$ 256	$ (334,143)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)			242,000
Issuance of common stock upon exercise of stock options	884			884
Stock-based compensation (in shares)			2,019,000
Stock-based compensation	12,732			12,732
Other comprehensive loss	(93)				(93)
Net loss	(55,043)					(55,043)
Ending balance (in shares) at Mar. 31, 2021			17,831,000
Ending balance at Mar. 31, 2021	$ (334,048)		$ 2	54,973	163	(389,186)
Beginning balance (in shares) at Dec. 31, 2021	0
Ending balance (in shares) at Mar. 31, 2022	0
Beginning balance (in shares) at Dec. 31, 2021	242,738,350		242,738,000
Beginning balance at Dec. 31, 2021	$ 929,787		$ 24	1,515,748	(1,623)	(584,362)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	1,709,498		1,710,000
Issuance of common stock upon exercise of stock options	$ 2,555		$ 1	2,554
Stock-based compensation (in shares)			975,000
Stock-based compensation	22,028			22,028
Other comprehensive loss	(4,977)				(4,977)
Net loss	$ (68,144)					(68,144)
Ending balance (in shares) at Mar. 31, 2022	245,422,849		245,423,000
Ending balance at Mar. 31, 2022	$ 881,249		$ 25	$ 1,540,330	$ (6,600)	$ (652,506)