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INCOME TAXES (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets (liabilities):    
Accrued compensation and benefits $ 6 $ 7
Inventory reserves 5 3
Allowance for doubtful accounts 14 0
Prepaid expenses and other (35) (52)
Warranty reserves 2 15
Intangible and other assets (267) (158)
Net operating loss carryforwards 3,757 4,756
Property, equipment and other 3 (10)
Research and development credit 2,951 2,890
Total deferred tax asset 6,436 7,451
Less: valuation allowance (1,612) (1,743)
Total deferred tax assets: $ 4,824 $ 5,708