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Basis of Presentation and Summary of Significant Accounting Policies - Warranty Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]        
Balance at beginning of period $ 258 $ 327 $ 331 $ 314
Accruals for warranties issued 17 30 44 46
Adjustments to existing warranties (17) (52) (66) (52)
Settlements made during the period (in kind) (79) (7) (130) (10)
Accrued warranty reserve $ 179 $ 298 $ 179 $ 298