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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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary difference from allowance for credit loss on accounts receivable.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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