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Net Loss Per Share Attributable to Common Stockholders | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Net Loss Per Share Attributable to Common Stockholders | 14. Net Loss Per Share Attributable to Common Stockholders The following outstanding shares of potentially dilutive securities were excluded from the computation of the diluted net loss per share attributable to common stockholders for the periods presented because their effect would have been anti-dilutive:
|  | As of December 31, |
|  | 2021 |  |  | 2020 |
Common stock options |  |  | 6,370,873 |  |  |  | 6,316,569 |
Unvested common stock |  |  | 26,283 |  |  |  | 100,263 |
ESPP withholdings |  |  | — |  |  |  | 4,393 |
Total potentially dilutive shares |  |  | 6,397,156 |  |  |  | 6,421,225 |

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