Inventories, Net and Significant Supplier - Inventory Reserve (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Schedule of Reserve for Excess and Obsolete Inventory [Rollforward]
Balance at beginning of period	$ 4,205	$ 3,045
Additions charged to costs and expenses	1,960	2,120
Sell through	(950)	(781)
(Write-offs)/Foreign exchange effects	(2,090)	(726)
Balance at end of period	3,125	3,658
Inventory scrapped during production	$ 200	$ 300