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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred income tax assets: |  |
U.S. federal net operating loss carryforward | $ 24,692 | $ 12,826
State net operating loss carryforward | 7,592 | 3,862
Research and development credits | 3,218 | 1,935
Non-qualified stock options | 1,665 | 75
Accrued bonus | 941 | 297
Operating lease liabilities | 570 | 556
Other | 179 | 173
Gross deferred income tax assets | 38,857 | 19,724
Less: Valuation allowance | (38,725) | (19,635)
Total deferred income tax assets | 132 | 89
Deferred Tax Liabilities, Net [Abstract] |  |
Depreciation | (132) | (89)
Net deferred income tax assets (liabilities) | $ 0 | $ 0

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