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Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2015
Dec. 31, 2014
Accrued Expenses    
Accrued development costs $ 994 $ 970
Accrued audit and legal 833 249
Accrued compensation 659 635
Accrued interest 34 71
Accrued other 212 31
Total accrued expenses $ 2,732 $ 1,956