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Basis of Presentation and Summary of Significant Accounting Policies - Warranty Activity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at beginning of period $ 314 $ 81
Accruals for warranties issued 16 332
Settlements made during the period (in cash or in kind) (3) (3)
Accrued warranty reserve $ 327 $ 410