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Accrued product warranty liability (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Accrued product warranty liability [Roll Forward]    
Balance, beginning of period $ 273 $ 267
Warranties issued 81 177
Warranty settlements (130) (141)
Balance, end of period 224 $ 303
Accrued product warranty liability, current 176  
Accrued product warranty liability, non-current $ 48  
Maximum [Member]    
Warranty [Abstract]    
Product warranty period 24 months