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Accrued product warranty liability (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Accrued product warranty liability [Roll Forward]    
Balance, beginning of period $ 215 $ 273
Warranties issued 53 138
Warranty settlements (107) (190)
Balance, end of period 161 $ 221
Accrued product warranty liability, current 128  
Accrued product warranty liability, non-current $ 33  
Maximum [Member]    
Warranty [Abstract]    
Product warranty period 24 months