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Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Accrued Liabilities [Abstract]    
Compensation $ 387 $ 2,131
Professional fees 153 466
Other expenses 542 615
Accrued Alferon production costs 74 70
Due for returned product 113 113
Total Accrued Expenses $ 1,269 $ 3,395