Product Warranties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Product Warranties Disclosures [Abstract]
Balance, beginning of year	$ 1,066	$ 556	$ 253
Additional accruals	727	991	415
Payments	(268)	(443)	(112)
Adjustments and other		(38)
Total	$ 1,525	$ 1,066	$ 556