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Basis of Presentation and Summary of Significant Accounting Policies - Warranty Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]        
Balance at beginning of period $ 179 $ 298 $ 331 $ 314
Accruals for warranties issued 18 65 152 111
Adjustments to existing warranties 30 (60) (36) (112)
In kind settlements made during the period (40) (8) (260) (18)
Accrued warranty reserve $ 187 $ 295 $ 187 $ 295