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Commitments and Contingencies - Warranty (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Changes in the liability for product warranty claim costs      
Balance at beginning of period $ 353 $ 41 $ 404
Accruals for warranties issued during the period 23 1,178 416
Settlements (in cash or in kind) during the period (341) (866) (779)
Balance at end of period $ 35 $ 353 $ 41