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Net Loss Per Share Attributable to Common Stockholders - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Anti-dilutive securities excluded from computation of earnings per share | 5,252,969 | 14,899,512
Series A Redeemable Convertible Preferred Stock |  |
Anti-dilutive securities excluded from computation of earnings per share | 0 | 3,804,344
Series B Redeemable Convertible Preferred Stock |  |
Anti-dilutive securities excluded from computation of earnings per share | 0 | 1,209,621
Series C Redeemable Convertible Preferred Stock |  |
Anti-dilutive securities excluded from computation of earnings per share | 0 | 2,342,857
Series D Redeemable Convertible Preferred Stock |  |
Anti-dilutive securities excluded from computation of earnings per share | 0 | 2,447,818
Series E Redeemable Convertible Preferred Stock |  |
Anti-dilutive securities excluded from computation of earnings per share | 0 | 1,899,847
Redeemable Convertible Preferred Stock Warrants |  |
Anti-dilutive securities excluded from computation of earnings per share | 0 | 42,163
Options to Purchase Common Stock |  |
Anti-dilutive securities excluded from computation of earnings per share | 5,229,169 | 3,152,862
Restricted Stock Units |  |
Anti-dilutive securities excluded from computation of earnings per share | 23,800 | 0

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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