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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)