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Summary of significant accounting policies, Warranty (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Accrued product warranty liability [Roll Forward]    
Balance, beginning of period $ 140 $ 215
Warranties issued 44 56
Warranty settlements (83) (131)
Balance, end of period 101 140
Accrued product warranty liability, current 79 112
Other Liabilities [Member]    
Accrued product warranty liability [Roll Forward]    
Accrued product warranty liability, long-term $ 22 $ 28
Maximum [Member]    
Warranty [Abstract]    
Product warranty period 24 months