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Accrued product warranty liability (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Warranty [Abstract]    
Product warranty period 24 months  
Accrued product warranty liability [Roll Forward]    
Balance, beginning of period $ 267 $ 267
Warranties issued 177 105
Warranty settlements (141) (123)
Balance, end of period 303 $ 249
Accrued product warranty liability, current 208  
Accrued product warranty liability, long-term $ 95