Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accrued Liabilities [Abstract]
Compensation	$ 1,002	$ 378
Professional fees	220	270
Other expenses	481	529
Accrued Alferon production costs	37	51
Total Accrued Expenses	$ 1,740	$ 1,228