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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Deferred tax assets: |  |  |
Employee compensation accruals | $ 1,377 | $ 2,772 |
Accrued liabilities | 54 | 197 |
Research tax credits | 2,330 | 1,429 |
Lease obligation | 4 | 38 |
Other | 233 | 160 |
Research expense capitalization | 5,441 | 3,203 |
Net operating losses | 29,875 | 24,595 |
Total deferred tax assets | 39,314 | 32,394 |
Deferred tax liabilities: |  |  |
Right of use asset | 13 | 50 |
Total deferred tax liabilities | 13 | 50 |
Valuation allowance | 39,301 | 32,344 | $ 23,125
Net deferred tax assets | $ 0 | $ 0 |

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