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Net Loss Per Share - Summary of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share Basic And Diluted [Abstract]      
Net loss $ (202,799) $ (142,978) $ (85,178)
Accretion of redeemable convertible preferred stock   (132,750) (13,036)
Net loss attributable to common stockholders $ (202,799) $ (275,728) $ (98,214)
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted 73,345,569 8,605,962 8,540,778
Net loss per share attributable to common stockholders, basic and diluted $ (2.76) $ (32.04) $ (11.50)