Accounts Receivable, Net and Revenue Concentrations - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Schedule of Allowance for Doubtful Accounts
Balance at beginning of period	$ 616	$ 478
Additions to costs and expenses	189	16
(Write-offs)/FX effects	(77)	(17)
Balance at end of period	$ 728	$ 477