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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Deferred tax assets: |  |  |
Net operating losses | $ 51,554 | $ 27,047 |
Research and development credits | 13,989 | 7,617 |
Accrued expenses | 292 | 291 |
Other | 775 | 474 |
Deferred rent | 0 | 266 |
Lease liability | 2,000 | 0 |
Stock based compensation | 1,816 | 428 |
Total deferred tax assets | 70,426 | 36,123 |
Deferred tax liabilities: |  |  |
Fixed asset basis | (61) | (124) |
Prepaid expenses | (921) | (558) |
Right of use asset | (1,760) | 0 |
Total deferred tax liabilities | (2,742) | (682) |
Valuation allowance | 67,684 | 35,441 | $ 21,929
Net deferred taxes | $ 0 | $ 0 |

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