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Commitments and Contingencies - Changes in the Liability for Product Warranty Claim Costs (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Schedule of Changes in Reserve for Product Warranty Claim Costs    
Balance at beginning of period $ 339 $ 134
Accruals for warranties issued during the period 787 169
Settlements (in cash or in kind) during the period (850) (85)
Balance at end of period $ 276 $ 218