Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Schedule of Changes in Aggregate Product Warranty Liabilities (Details)

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Commitments and Contingencies - Schedule of Changes in Aggregate Product Warranty Liabilities (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]    
Product warranty liability at beginning of period $ 6,171 $ 3,480
Accruals for warranties issued 4,050 5,275
Adjustments related to preexisting warranties (including changes in estimates) 300 200
Settlements made (in cash or in kind) (1,791) (2,784)
Product warranty liability at end of period $ 8,730 $ 6,171