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Income Taxes - Schedule of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax asset: |  |
Net operating loss carryforwards | $ 20,460 | $ 9,891
Accrued expenses and other | 3,520 | 1,345
Stock compensation | 779 | 182
Credit carryforwards | 6,194 | 3,708
Deferred revenue | 0 | 2,631
Capital loss carryforwards | 484 | 27
Gross deferred tax asset | 31,437 | 17,784
Less valuation allowance | (30,331) | (17,285)
Net deferred tax asset | 1,106 | 499
Deferred tax liability: |  |
Depreciation and amortization | (578) | (121)
Prepaid expenses | (528) | (378)
Total deferred tax liability | (1,106) | (499)
Total net deferred tax asset | $ 0 | $ 0

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