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Accrued product warranty liability (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Accrued product warranty liability [Roll Forward]    
Balance, beginning of period $ 215 $ 273
Warranties issued 55 81
Warranty settlements (78) (130)
Balance, end of period 192 $ 224
Accrued product warranty liability, current 153  
Accrued product warranty liability, non-current $ 39  
Maximum [Member]    
Warranty [Abstract]    
Product warranty period 24 months