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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets [Abstract]    
Accrued expenses $ 269 $ 262
Share based compensation 99 107
Net operating loss carryforwards 13,397 12,605
Income tax credit carryforwards 1,630 956
Property and equipment, principally due to differences in depreciation 154 89
Intangible assets 3,527 2,073
Other, net 453 53
Deferred tax assets (Total) 19,529 16,145
Valuation allowance (19,486) (16,092)
Total deferred tax assets, net of allowance 43 53
Deferred tax liabilities [Abstract]    
Other (43) (53)
Total deferred tax liability (43) (53)
Net deferred tax assets (liability) $ 0 $ 0