Net Loss per Share Attributable to Common Stock - Computation of Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net loss	$ (109,613)	$ (18,527)	$ (80,805)
Dividends on convertible preferred stock	(7,269)	(4,454)	0
Net loss attributable to common stock—basic	(116,882)	(22,981)	(80,805)
Net loss attributable to common stock—diluted	$ (116,882)	$ (22,981)	$ (80,805)
Denominator:
Weighted average shares of common stock— basic (in shares)	104,683,460	98,574,529	91,583,533
Weighted average shares of common stock— diluted (in shares)	104,683,460	98,574,529	91,583,533
Net loss per share attributable to common stock—basic (in dollars per share)	$ (1.12)	$ (0.23)	$ (0.88)
Net loss per share attributable to common stock— diluted (in dollars per share)	$ (1.12)	$ (0.23)	$ (0.88)