Income Taxes Components of income tax expense/ (benefit) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Components of Income Tax Expense/ (Benefit) [Abstract]
Current	$ 0	$ 0	$ 0
Deferred	0	0	0
Total federal provision	0	0	0
Current	17	5	4
Deferred	0	0	0
Total state provision	17	5	4
Current	294	214	325
Deferred	0	0	0
Total foreign provision	294	214	325
Total income tax expense	$ 311	$ 219	$ 329