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Net Loss Per Common Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation (in shares) 28,075,129 150,698,970 138,908,856
Restricted stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Vested (in shares) 124,026   0
Redeemable convertible preferred stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation (in shares) 0 127,082,605 117,788,521
Common stock warrants      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation (in shares) 0 256,250 256,250
Stock options outstanding      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation (in shares) 23,386,942 21,034,424 19,045,751
RSUs outstanding      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation (in shares) 3,496,611 437,369 0
ESPP      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation (in shares) 735,282 0 0
Shares subject to repurchase      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation (in shares) 456,294 1,888,322 1,818,334