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Net Loss Per Share Attributable To Common Stockholders - Potentially Dilutive Securities (Details) - shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 11,181,256 30,711,502
Convertible preferred stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 0 22,173,216
Class A common stock options issued and outstanding    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 9,839,354 5,701,527
Restricted common stock subject to future vesting    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 652,418 2,836,759
Restricted stock units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 689,484 0