Accounts Receivable, Net and Revenue Concentrations - Allowance for Doubtful Accounts (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Schedule of Allowance for Doubtful Accounts
Balance at Beginning of Period	$ 322	$ 1,021
Additions to Costs and Expenses	48	37
(Write-offs)/FX Effects	(45)	(7)
Balance at End of Period	$ 325	$ 1,051