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Income Taxes - Components of Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 41,443 | $ 11,277
Research and development tax credits | 5,586 | 1,855
Deferred revenue | 3,117 | 4,443
Accrued expenses | 477 | 153
Intangibles and fixed assets | 2,137 | 2,483
Lease liability | 3,291 | 263
Stock-based compensation | 3,668 | 969
Total deferred tax assets | 59,719 | 21,443
Less valuation allowance | (56,693) | (21,316)
Net deferred tax assets | 3,026 | 127
Deferred tax liabilities: |  |
Right-of-use asset | (3,026) | (127)
Total deferred tax liabilities | (3,026) | (127)
Net deferred tax assets | $ 0 | $ 0

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