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Net Loss Per Share Attributable to Common Stockholders | 9 Months Ended | 12 Months Ended
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Sep. 30, 2023 | Dec. 31, 2022
Earnings Per Share [Abstract] |  |
Net Loss Per Share Attributable to Common Stockholders | 12. Net Loss Per Share Attributable to Common Stockholders The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders, which excludes shares which are legally outstanding, but subject to repurchase by the Company (in thousands, except share and per share amounts):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ | (22,485 | ) |  | $ | (24,682 | ) |  | $ | (101,733 | ) |  | $ | (76,453 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding |  |  | 57,977,907 |  |  |  | 58,189,211 |  |  |  | 58,064,472 |  |  |  | 58,085,711 |
Less: weighted-average unvested restricted shares and shares subject to repurchase |  |  | (720,666 | ) |  |  | (2,983,072 | ) |  |  | (1,315,477 | ) |  |  | (3,494,118 | )
Weighted-average shares used to compute basic and diluted net loss per share attributable to common stockholders |  |  | 57,257,241 |  |  |  | 55,206,139 |  |  |  | 56,748,995 |  |  |  | 54,591,593 |
Net loss per share attributable to common stockholders—basic and diluted: |  | $ | (0.39 | ) |  | $ | (0.45 | ) |  | $ | (1.79 | ) |  | $ | (1.40 | )
Anti-dilutive Outstanding Shares or Equivalents The following outstanding options, unvested shares, and ESPP shares were excluded (as common stock equivalents) from the computation of diluted net loss per common share for the periods presented as their effect would have been anti-dilutive (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Options to purchase common stock |  |  | 6,380,515 |  |  |  | 7,849,590 |  |  |  | 6,380,515 |  |  |  | 7,849,590 |
Common stock subject to vesting or repurchase |  |  | 873,062 |  |  |  | 3,236,152 |  |  |  | 873,062 |  |  |  | 3,236,152 |
Employee Stock Purchase Plan shares |  |  | 10,437 |  |  |  | 128,888 |  |  |  | 10,437 |  |  |  | 128,888 |
Total |  |  | 7,264,014 |  |  |  | 11,214,630 |  |  |  | 7,264,014 |  |  |  | 11,214,630 |
| 12. Net Loss Per Share Attributable to Common Stockholders The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders, which excludes shares which are legally outstanding, but subject to repurchase by the Company (in thousands, except share and per share amounts):
|  | Year Ended December 31, |
|  | 2022 |  |  | 2021 |
Numerator: |  |  |  |  |  |  |  |
Net loss |  | $ | (101,052 | ) |  | $ | (70,760 | )
Denominator: |  |  |  |  |  |  |  |
Weighted-average common shares outstanding |  |  | 58,111,437 |  |  |  | 35,121,114 |
Less: weighted-average unvested restricted shares and shares subject to repurchase |  |  | (3,237,762 | ) |  |  | (6,201,859 | )
Weighted-average shares used to compute basic and diluted net loss per share attributable to common stockholders |  |  | 54,873,675 |  |  |  | 28,919,255 |
Net loss per share attributable to common stockholders—basic and diluted: |  | $ | (1.84 | ) |  | $ | (2.45 | )
Anti-dilutive Outstanding Shares or Equivalents The following outstanding options, unvested shares, and ESPP shares were excluded (as common stock equivalents) from the computation of diluted net loss per common share for the periods presented as their effect would have been antidilutive (in thousands):
|  | Year Ended December 31, |
|  | 2022 |  |  | 2021 |
Options to purchase common stock |  |  | 7,755,303 |  |  |  | 5,056,743 |
Common stock subject to vesting or repurchase |  |  | 2,767,526 |  |  |  | 4,774,798 |
Employee Stock Purchase Plan shares |  |  | 168,080 |  |  |  | 99,252 |
Total |  |  | 10,690,909 |  |  |  | 9,930,793 |

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