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INCOME TAXES (Details 3) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred income tax assets: |  |
Allowance for doubtful accounts | $ 13 | $ 10
Inventory and product return reserves | 484 | 573
Compensation accruals | 2,421 | 1,973
Accrued liabilities | 202 | 179
Book-over-tax depreciation and amortization | 23 | 91
Foreign net operating loss carryforwards | 22 | 53
U.S. net operating loss carryforwards | 3,301 | 3,739
U.S. credit carryforwards | 1,440 | 2,345
Deferred tax assets, gross | 7,906 | 8,963
Valuation allowance | (7,906) | (8,963)
Total deferred income tax assets | $ 0 | $ 0

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