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Income taxes, Deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets [Abstract]    
Deferred Tax Assets, Operating Loss Carryforwards, Domestic $ 1,976 $ 0
Foreign net operating losses 624 563
Depreciation 306 302
Inventory reserves 710 719
Deferred revenue 24 47
Warranty reserve 22 31
Stock compensation expense 796 731
Other accrued compensation 308 388
R&D credit carryforward 901 460
Other liabilities and reserves 250 394
Gross deferred tax assets 5,917 3,635
Valuation allowance (733) (659)
Net deferred tax assets 5,184 2,976
Deferred tax liabilities [Abstract]    
Other 43 37
Net deferred tax liabilities 43 37
Total net deferred tax assets $ 5,141 $ 2,939