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Accrued product warranty liability (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Accrued product warranty liability [Roll Forward]    
Balance, beginning of period $ 273 $ 267
Warranties issued 40 80
Warranty settlements (60) (69)
Balance, end of period 253 $ 278
Accrued product warranty liability, current 199  
Accrued product warranty liability, non-current $ 54  
Maximum [Member]    
Warranty [Abstract]    
Product warranty period 24 months