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Net Loss Per Share | 9 Months Ended | 12 Months Ended
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Sep. 30, 2023 | Dec. 31, 2022
Earnings Per Share [Abstract] |  |
Net Loss Per Share | 13. Net Loss Per Share The Company computes net loss attributable per common stockholder using the two-class method required for participating securities. The Company considers convertible. preferred stock to be participating securities. In the event that the Company paid out distributions, holders of convertible preferred stock would participate in the distribution. The two-class method is an earnings (loss) allocation method under which earnings (loss) per share is calculated for common stock and participating security considering a participating security’s rights to undistributed earnings (loss) as if all such earnings (loss) had been distributed during the period. The holders of Series A Preferred Stock do not have an obligation to fund losses and therefore the Series A Preferred Stock was excluded from the calculation of basic net loss per share. The Company included in the calculation of basic net loss per share, contingently issuable common shares related to the Asset Acquisition because they will be issued for no consideration due to the consideration already having been satisfied as of September 30, 2023. Basic and diluted net loss per share is computed by dividing the net loss by the weighted-average number of common stock and pre-funded warrants outstanding during the period, without consideration of potential dilutive securities. The pre-funded warrants are included in the computation of basic net loss per share as the exercise price is negligible and they are fully vested and exercisable. For periods in which the Company generated a net loss, the Company does not include the potential impact of dilutive securities in diluted net loss per share, as the impact of these items is anti-dilutive. The Company has generated a net loss for all periods presented, therefore diluted net loss per share is the same as basic net loss per share since the inclusion of potentially dilutive securities would be anti-dilutive. The following weighted-average equity instruments were excluded from the calculation of diluted net loss per share because their effect would have been anti-dilutive for the periods presented:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Options to purchase common stock |  |  | 3,135,672 |  |  |  | 351,533 |  |  |  | 1,426,224 |  |  |  | 335,395 |
Unvested restricted stock units |  |  | — |  |  |  | 6,000 |  |  |  | 252 |  |  |  | 7,315 |
Series A Preferred Stock (on an as-converted basis) |  |  | 42,501,681 |  |  |  | — |  |  |  | 14,851,447 |  |  |  | — |
| 13. Net Loss Per Share Basic and diluted net loss per share is computed by dividing net loss by the weighted-average number of common stock and pre-funded warrants outstanding during the period. The pre-funded warrants are included in the computation of basic net loss per share as the exercise price is negligible and they are fully vested and exercisable. For periods in which the Company generated a net loss, the Company does not include the potential impact of dilutive securities in diluted net loss per share, as the impact of these items is anti-dilutive. The following weighted-average equity instruments were excluded from the calculation of diluted net loss per share because their effect would have been anti-dilutive for the periods presented:
|  | Year Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Options to purchase common stock |  |  | 346,331 |  |  |  | 264,858 |  |  |  | 201,977 |
Unvested restricted stock units |  |  | 6,982 |  |  |  | 7,975 |  |  |  | 4,239 |
The following is a reconciliation of the shares used as the denominator for the calculation of basic and diluted net loss per share:
|  | Year Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Weighted average common shares |  |  | 2,307,668 |  |  |  | 1,956,933 |  |  |  | 1,608,952 |
Weighted average pre-funded warrants |  |  | 1,063,563 |  |  |  | 672,851 |  |  |  | 525,917 |
Total basic and diluted weighted average shares |  |  | 3,371,231 |  |  |  | 2,629,784 |  |  |  | 2,134,869 |

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