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