Accounts Receivable, Net and Revenue Concentrations - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Schedule of Allowance for Doubtful Accounts
Balance at beginning of period	$ 616	$ 478
Additions to costs and expenses	138	69
(Write-offs)/FX effects	(68)	3
Balance at end of period	$ 686	$ 550