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Net Loss Per Share Attributable to Common Stockholders - Schedule of Antidilutive Securities Excluded from Computation of Net Loss Per Share Attributable to Common Stockholders (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Redeemable convertible preferred stock 3,085,954 4,483,190 3,085,954 4,483,190
Common Stock Options [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Redeemable convertible preferred stock 2,737,315 366,501 2,737,315 366,501
Unvested Restricted Stock Awards [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Redeemable convertible preferred stock 348,639 117,556 348,639 117,556
Redeemable Convertible Preferred Stock [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Redeemable convertible preferred stock 0 3,999,133 0 3,999,133