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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred Tax Assets: |  |
Accrued expenses | $ 86 | $ 74
Stock-based compensation | 388 | 337
Depreciation | 177 | 102
Prepaid expenses | 61 | (31)
Accrued vacation | (1) | (3)
ASC 842 lease standard | (51) | (16)
Net operating loss carryforwards | 21,020 | 20,263
Gross deferred tax assets | 21,680 | 20,726
Valuation allowance | (21,598) | (20,677)
Total deferred tax assets, net of valuation allowance | 82 | 49
Deferred tax liabilities |  |
Other | $ (82) | $ (49)

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