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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Operating loss carryforwards |  |
Effective tax rate (as a percent) | 0.00% | 0.00%
Income tax benefit | $ 0 |
Deferred Tax Assets, Gross | 4,428 | $ 30,754
Deferred Tax Assets, Valuation Allowance, Total | 4,400 | 30,800
Federal net operating loss carryforwards | 1,500 | 81,800
Federal research credit carry forward | 24,000 | 1,000
Research and development credit carryforwards | 26 | 1,483
State net operating loss carryforwards | 65,000 | 42,600
State research credit carryforwards | 2,000 | 600
Income tax: |  |
Uncertain tax positions | 0 | 0
Interest or penalties | 0 | 0
Federal |  |
Operating loss carryforwards |  |
Deferred Tax Assets, Valuation Allowance, Total | 4,252 | 30,410
Net operating loss carryforwards written off | 99,000 |
Research credit carryforwards written off | 1,200 |
State |  |
Operating loss carryforwards |  |
Net operating loss carryforwards written off | 48,500 |
Research credit carryforwards written off | 600 |
Foreign |  |
Operating loss carryforwards |  |
Deferred Tax Assets, Valuation Allowance, Total | 176 | 324
Operating Loss Carryforwards | $ 700 | $ 1,300

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