Accounts Receivable, Net and Revenue Concentrations - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Schedule of Allowance for Doubtful Accounts
Balance at beginning of period	$ 822	$ 616
Additions (reductions) to costs and expenses	(40)	2
(Write-offs)/Foreign exchange effects	17	(18)
Balance at end of period	$ 799	$ 600