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Accrued product warranty liability (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Accrued product warranty liability [Roll Forward]    
Balance, beginning of period $ 267 $ 277
Warranties issued 184 206
Warranty settlements (187) (200)
Balance, end of period 264 $ 283
Accrued product warranty liability, current 184  
Accrued product warranty liability, long-term $ 80  
Maximum [Member]    
Warranty [Abstract]    
Product warranty period 24 months