Inventories, Net and Significant Supplier - Inventory Reserve (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2017	Jun. 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]	1,218	1,486
Sell through	[2]	(576)	(537)
(Write-offs)/Foreign exchange effects		(640)	(445)
Balance at end of period		4,207	3,549
Inventory scrapped during production		$ 200	$ 200

[1] The additions charged to costs and expenses do not include inventory directly written-off that was scrapped during production totaling $0.2 million and $0.2 million for the six months ended June 30, 2017 and 2016, respectively. These amounts are production waste and are not included in management's reserve for excess and obsolete inventory.

[2] These amounts represent the reduction in reserves associated with inventory items that were sold during the period.