Warranties (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Product Warranty Liability [Line Items]
Beginning balance	$ 1,223	$ 760
Warranty provisions	38	185
Warranty claims	(111)	(288)
Adjustments to preexisting warranties	(167)	27
Currency	4	0
Ending balance	$ 987	$ 684
Minimum [Member]
Product Warranty Liability [Line Items]
Product Warranty Period	2 years
Maximum [Member]
Product Warranty Liability [Line Items]
Product Warranty Period	5 years