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Income Taxes - Significant Components of Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Deferred tax assets: |  |  |
Employee compensation accruals | $ 1,777 | $ 796 |
Accrued liabilities | 29 | 361 |
Research tax credits | 721 | 346 |
Lease obligation | 107 | 265 |
Other | 89 | 87 |
Net operating losses | 20,520 | 19,742 |
Total deferred tax assets | 23,243 | 21,597 |
Deferred tax liabilities: |  |  |
Right of use asset | 118 | 265 |
Total deferred tax liabilities | 118 | 265 |
Valuation allowance | 23,125 | 21,332 | $ 14,793
Net deferred tax assets | $ 0 | $ 0 |

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