Net Loss Per Share Attributable to Common Stockholders - Summary of Calculation of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net loss	$ (113,161)	$ (108,595)	$ (111,903)	$ (115,490)	$ (116,529)	$ (385,160)	$ (333,659)	$ (617,179)
Less: Accretion of redeemable convertible preferred stock	0			0			0	(4,135)
Net loss attributable to common stockholders, basic	(113,161)			(115,490)			(333,659)	(621,314)
Net loss attributable to common stockholders, diluted	$ (113,161)			$ (115,490)			$ (333,659)	$ (621,314)
Denominator:
Weighted-average shares used in computing net loss per share, basic (In shares)	224,745,672			212,802,379			223,698,744	152,469,098
Weighted-average shares used in computing net loss per share, diluted (in shares)	224,745,672			212,802,379			223,698,744	152,469,098
Net loss per share:
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.50)			$ (0.54)			$ (1.49)	$ (4.08)
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.50)			$ (0.54)			$ (1.49)	$ (4.08)