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Commitments and Contingencies - Warranty (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Schedule of Changes in Reserve for Product Warranty Claim Costs    
Balance at beginning of period $ 35 $ 353
Accruals for warranties issued during the period 100 12
Settlements (in cash or in kind) during the period 0 (329)
Balance at end of period $ 135 $ 36