Product Warranties (Tables)

12 Months Ended

Dec. 31, 2017

Guarantees and Product Warranties [Abstract]

Schedule of Changes in Accrued Warranty Liabilities

Changes in accrued warranty liabilities for the years ended December 31, 2017, 2016 and 2015 are as follows (in thousands):

	Year Ended December 31,
	2017			2016			2015
Beginning balance	$	466		$	1,425		$	2,973
Change in provision		(224	)		(426	)		(648	)
Usage		(65	)		(527	)		(758	)
Translation adjustments		39			(6	)		(142	)
Ending balance	$	216		$	466		$	1,425