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Income Taxes - Reconciliation of tax rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Income Taxes |  |
Federal income tax rate (as a percent) | 21.00% |
Tax benefit at federal statutory rate | $ (1,091) | $ (1,209)
Tax benefit at state rate | (126) | (197)
Meals and entertainment | 5 | 4
Prior year deferred tax true ups |  | (2,805)
Other | (75) | (82)
Change in valuation allowance | 1,287 | 4,289
Provision for income taxes | $ 0 | $ 0

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