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Income taxes, Deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets [Abstract]    
Federal net operating losses $ 276 $ 0
Foreign net operating losses 802 733
State net operating losses 135 84
Accrued severance 20 165
Capitalized R&D expenses 3,708 3,127
Inventory reserves 1,047 896
Deferred revenue 7 31
Warranty reserve 29 24
Stock compensation expense 853 790
Other accrued compensation 165 404
R&D credit carryforward 903 695
Other Assets 379 360
Gross deferred tax assets 8,324 7,309
Valuation allowance (8,103) (719)
Net deferred tax assets 221 6,590
Deferred tax liabilities [Abstract]    
Depreciation and amortization 179 237
Other 42 49
Net deferred tax liabilities 221 286
Total net deferred tax assets $ 0 $ 6,304