Accounts Receivable, Net and Revenue Concentrations - Allowance for Doubtful Accounts (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Schedule of Allowance for Doubtful Accounts
Allowance for Doubtful Accounts, Balance at Beginning of Period	$ 322	$ 1,021
Additions to Costs and Expenses	140	72
(Write-offs)/FX Effects	(37)	(775)
Allowance for Doubtful Accounts, Balance at End of Period	$ 425	$ 318