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Product Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Product Warranties Disclosures [Abstract]    
Period to claim reimbursement under limited warranty program 10 years  
Beginning balance $ 1,378 $ 1,332
Payments made during the period   (4)
Changes in accrual related to warranties issued during the period 51 16
Changes in accrual related to pre-existing warranties 6 (1)
Ending Balance $ 1,435 $ 1,343