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Fair Value Measurements - Financial Assets and Liabilities Measured on a Recurring Basis (Details) - Recurring - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Assets: |  |
Assets, fair value | $ 163,547 | $ 112,082
Liabilities: |  |
Liabilities, fair value | 2,055 | 1,656
Derivative liabilities for exit fees |  |
Liabilities: |  |
Liabilities, fair value | 2,055 | 1,656
Level 1 |  |
Assets: |  |
Assets, fair value | 32,234 | 84,313
Liabilities: |  |
Liabilities, fair value | 0 | 0
Level 1 | Derivative liabilities for exit fees |  |
Liabilities: |  |
Liabilities, fair value | 0 | 0
Level 2 |  |
Assets: |  |
Assets, fair value | 131,313 | 27,769
Liabilities: |  |
Liabilities, fair value | 0 | 0
Level 2 | Derivative liabilities for exit fees |  |
Liabilities: |  |
Liabilities, fair value | 0 | 0
Level 3 |  |
Assets: |  |
Assets, fair value | 0 | 0
Liabilities: |  |
Liabilities, fair value | 2,055 | 1,656
Level 3 | Derivative liabilities for exit fees |  |
Liabilities: |  |
Liabilities, fair value | 2,055 | 1,656
Money market funds |  |
Assets: |  |
Assets, fair value | 32,234 | 84,313
Money market funds | Level 1 |  |
Assets: |  |
Assets, fair value | 32,234 | 84,313
Money market funds | Level 2 |  |
Assets: |  |
Assets, fair value | 0 | 0
Money market funds | Level 3 |  |
Assets: |  |
Assets, fair value | 0 | 0
Commercial paper |  |
Assets: |  |
Assets, fair value | 82,719 | 25,291
Commercial paper | Level 1 |  |
Assets: |  |
Assets, fair value | 0 | 0
Commercial paper | Level 2 |  |
Assets: |  |
Assets, fair value | 82,719 | 25,291
Commercial paper | Level 3 |  |
Assets: |  |
Assets, fair value | 0 | 0
U.S. government-sponsored agency bonds |  |
Assets: |  |
Assets, fair value | 31,811 | 1,479
U.S. government-sponsored agency bonds | Level 1 |  |
Assets: |  |
Assets, fair value | 0 | 0
U.S. government-sponsored agency bonds | Level 2 |  |
Assets: |  |
Assets, fair value | 31,811 | 1,479
U.S. government-sponsored agency bonds | Level 3 |  |
Assets: |  |
Assets, fair value | 0 | 0
Corporate bonds |  |
Assets: |  |
Assets, fair value | 6,282 | 999
Corporate bonds | Level 1 |  |
Assets: |  |
Assets, fair value | 0 | 0
Corporate bonds | Level 2 |  |
Assets: |  |
Assets, fair value | 6,282 | 999
Corporate bonds | Level 3 |  |
Assets: |  |
Assets, fair value | 0 | 0
Asset-backed securities |  |
Assets: |  |
Assets, fair value | 10,501 | 0
Asset-backed securities | Level 1 |  |
Assets: |  |
Assets, fair value | 0 | 0
Asset-backed securities | Level 2 |  |
Assets: |  |
Assets, fair value | 10,501 | 0
Asset-backed securities | Level 3 |  |
Assets: |  |
Assets, fair value | $ 0 | $ 0

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