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Accrued liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accrued liabilities [Abstract]    
Salaries and compensation related $ 2,854 $ 2,328
Warranty 79 112
Professional and consulting 285 257
Other 676 968
Accrued liabilities $ 3,894 $ 3,665