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Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Payables and Accruals [Abstract]    
Compensation $ 1,928 $ 378
Professional fees 172 270
Other expenses 536 529
Accrued Alferon production costs 23 51
Total Accrued Expenses $ 2,659 $ 1,228