Quarterly report pursuant to Section 13 or 15(d)

Warranty Liability - Schedule of Warranty Liability Which is Included in Accrued Expenses on Condensed Consolidated Balance Sheet (Details)

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Warranty Liability - Schedule of Warranty Liability Which is Included in Accrued Expenses on Condensed Consolidated Balance Sheet (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Guarantees And Product Warranties [Abstract]    
Beginning balance $ 1,103 $ 1,742
Additions 442 121
Cost of warranty claims (352) (372)
Ending balance $ 1,193 $ 1,491