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Redeemable Convertible Preferred Stock and Stockholders’ Equity (Tables) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Dec. 31, 2020
Equity [Abstract] |  |
Common Stock Reserved For Future Issuance | As of September 30, 2021, the Company had reserved the following shares of common stock for future issuance:
Options outstanding | 7,064,945 |
Options reserved for future issuance | 12,730,521 |
Restricted stock outstanding | 156,852 |
Restricted stock units | 164,487 |
Total authorized shares of common stock reserved for future issuance | 20,116,805 |
| As of December 31, 2020, the Company had reserved the following shares of common stock for future issuance:
Conversion of Series A Preferred Stock | 10,138,200 |
Conversion of Series A-1 Preferred Stock | 5,512,800 |
Conversion of Series B Preferred Stock | 14,044,200 |
Options reserved for future issuance | 1,938,321 |
Options outstanding | 7,611,258 |
Restricted stock outstanding | 156,852 |
Total authorized shares of common stock reserved for future issuance | 39,401,631 |

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