Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net loss	$ (90,471)	$ (68,294)	$ (53,239)	$ (50,981)	$ (158,765)	$ (104,220)
Denominator:
Weighted-average shares used in calculating net loss per share, basic and diluted	148,295,716		127,482,127		148,141,180	127,354,540
Net loss per share, basic and diluted	$ (0.61)		$ (0.42)		$ (1.07)	$ (0.82)