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Income Taxes - Deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred income tax assets:    
Allowances not currently deductible $ 283 $ 301
Depreciation and amortization 58 9
Equity compensation not currently deductible 2,098 1,579
Net operating loss carryforwards 10,514 10,758
Research and development credits 452 362
Expenses not deductible until paid 1,972 1,694
Other 133 (220)
Total gross deferred income tax assets before valuation allowance 15,510 14,483
Valuation allowance (13,769) (13,008)
Deferred income tax assets, net 1,741 1,475
Deferred income tax liabilities:    
Other (22) (65)
Total deferred income tax liabilities (22) (65)
Net deferred income tax assets 1,719 1,410
Net deferred income tax assets 1,741 1,475
Net deferred income tax liability (22) (65)
Net deferred income tax assets $ 1,719 $ 1,410