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Income Taxes - Deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred income tax assets:    
Allowances not currently deductible $ 183 $ 192
Depreciation and amortization 308 334
Equity compensation not currently deductible 831 778
Net operating loss carryforwards 7,741 6,751
Expenses not deductible until paid 1,829 1,691
Other 153 358
Total gross deferred income tax assets before valuation allowance 11,045 10,104
Valuation allowance (9,095) (7,917)
Deferred income tax assets, net 1,950 2,187
Deferred income tax liabilities:    
Other (15) (44)
Total deferred income tax liabilities (15) (44)
Net deferred income tax assets 1,935 2,143
Net deferred income tax assets 1,950 2,187
Net deferred income tax liability (15) (44)
Net deferred income tax assets $ 1,935 $ 2,143