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Accrued product warranty liability (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Accrued product warranty liability [Roll Forward]    
Balance, beginning of period $ 140 $ 215
Warranties issued 19 55
Warranty settlements (45) (78)
Balance, end of period 114 $ 192
Accrued product warranty liability, current 87  
Other Liabilities [Member]    
Accrued product warranty liability [Roll Forward]    
Accrued product warranty liability, non-current $ 27  
Maximum [Member]    
Warranty [Abstract]    
Product warranty period 24 months