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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Financial Assets: |  |  |
Financial assets, fair value | $ 185,372 | $ 46,853 | $ 86,874
Liabilities: |  |  |
Liabilities, fair value | 31,152 |  |
Corporate bonds |  |  |
Financial Assets: |  |  |
Financial assets, fair value | 22,828 | 3,732 | 12,574
Commercial paper |  |  |
Financial Assets: |  |  |
Financial assets, fair value | 107,093 | 23,641 | 65,412
Level 1 |  |  |
Financial Assets: |  |  |
Financial assets, fair value | 55,451 | 15,250 | 8,888
Liabilities: |  |  |
Liabilities, fair value | 0 |  |
Level 1 | Corporate bonds |  |  |
Financial Assets: |  |  |
Financial assets, fair value | 0 | 0 |
Level 1 | Commercial paper |  |  |
Financial Assets: |  |  |
Financial assets, fair value | 0 | 0 |
Level 2 |  |  |
Financial Assets: |  |  |
Financial assets, fair value | 129,921 | 31,603 | 77,986
Liabilities: |  |  |
Liabilities, fair value | 2,952 |  |
Level 2 | Corporate bonds |  |  |
Financial Assets: |  |  |
Financial assets, fair value | 22,828 | 3,732 | 12,574
Level 2 | Commercial paper |  |  |
Financial Assets: |  |  |
Financial assets, fair value | 107,093 | 23,641 | 65,412
Level 3 |  |  |
Financial Assets: |  |  |
Financial assets, fair value | 0 | 0 |
Liabilities: |  |  |
Liabilities, fair value | 28,200 |  |
Level 3 | Corporate bonds |  |  |
Financial Assets: |  |  |
Financial assets, fair value | 0 | 0 |
Level 3 | Commercial paper |  |  |
Financial Assets: |  |  |
Financial assets, fair value | 0 | 0 |
Parapyre Option Obligation |  |  |
Liabilities: |  |  |
Liabilities, fair value | 2,952 |  |
Parapyre Option Obligation | Level 1 |  |  |
Liabilities: |  |  |
Liabilities, fair value | 0 |  |
Parapyre Option Obligation | Level 2 |  |  |
Liabilities: |  |  |
Liabilities, fair value | 2,952 |  |
Parapyre Option Obligation | Level 3 |  |  |
Liabilities: |  |  |
Liabilities, fair value | 0 |  |
CVR liability |  |  |
Liabilities: |  |  |
Liabilities, fair value | 28,200 |  |
CVR liability | Level 1 |  |  |
Liabilities: |  |  |
Liabilities, fair value | 0 |  |
CVR liability | Level 2 |  |  |
Liabilities: |  |  |
Liabilities, fair value | 0 |  |
CVR liability | Level 3 |  |  |
Liabilities: |  |  |
Liabilities, fair value | 28,200 |  |
Money market funds |  |  |
Financial Assets: |  |  |
Financial assets, fair value | 55,451 | 15,250 | 8,888
Money market funds | Level 1 |  |  |
Financial Assets: |  |  |
Financial assets, fair value | 55,451 | 15,250 | $ 8,888
Money market funds | Level 2 |  |  |
Financial Assets: |  |  |
Financial assets, fair value | 0 | 0 |
Money market funds | Level 3 |  |  |
Financial Assets: |  |  |
Financial assets, fair value | $ 0 | 0 |
U.S. government securities |  |  |
Financial Assets: |  |  |
Financial assets, fair value |  | 4,230 |
U.S. government securities | Level 1 |  |  |
Financial Assets: |  |  |
Financial assets, fair value |  | 0 |
U.S. government securities | Level 2 |  |  |
Financial Assets: |  |  |
Financial assets, fair value |  | 4,230 |
U.S. government securities | Level 3 |  |  |
Financial Assets: |  |  |
Financial assets, fair value |  | $ 0 |

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