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	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net loss	$ (732,673)	$ (177,870)	$ (84,840)
Less: Accretion of redeemable convertible preferred stock	(4,135)	(20,959)	(201)
Less: Deemed dividend on exchange of Series A-2 redeemable convertible preferred stock for Class A common stock	0	0	(60,000)
Net loss attributable to common stockholders, basic	(736,808)	(198,829)	(145,041)
Net loss attributable to common stockholders, diluted	$ (736,808)	$ (198,829)	$ (145,041)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted	169,080,392	58,929,271,000	58,700,441,000
Net loss per share:
Net loss per share attributable to common stockholders, basic and diluted	$ (4.36)	$ (3.37)	$ (2.47)