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Supplemental Financial Information - Warranty Obligations (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]  
Balance, beginning of period $ 287
Warranties accrued, net 580
Consumption of warranty obligations accrued (291)
Change in estimate related to previous warranties accrued 25
Balance, end of period $ 601