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Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Payables and Accruals [Abstract]    
Clinical trial costs $ 5,179 $ 6,967
Compensation and related benefits 992 1,040
Professional fees 1,121 821
Interest expense 37 57
Accrued expenses and other current liabilities $ 7,329 $ 8,885