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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

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