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Income Taxes - Schedule of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Deferred tax asset: |  |
Net operating loss carryforwards | $ 31,393 | $ 24,867
Accrued expenses and other | 1,827 | 3,578
Stock compensation | 2,431 | 1,533
Credit carryforwards | 13,614 | 10,101
Capital loss carryforwards | 583 | 583
Capitalized R&D expense | 27,210 | 15,017
Lease liabilities | 882 | 1,030
Gross deferred tax asset | 77,940 | 56,709
Less valuation allowance | (76,386) | (55,044)
Net deferred tax asset | 1,554 | 1,665
Deferred tax liability: |  |
Depreciation and amortization | (744) | (676)
Prepaid expenses | (334) | (436)
Lease assets | (476) | (553)
Total deferred tax liability | (1,554) | (1,665)
Total net deferred tax asset | $ 0 | $ 0

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