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Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Accrued Expenses    
Accrued clinical trial expenses $ 1,444 $ 2,484
Accrued technical operation expenses 751 1,220
Accrued professional fees 764 24
Accrued interest payable 159 159
Other accrued expenses 25 18
Total accrued expenses $ 3,143 $ 3,905