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Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Clinical trial costs $ 899 $ 3,088
Professional fees 660 229
Compensation and related benefits 976 975
Interest expense 99 0
Accrued expenses and other current liabilities $ 2,634 $ 4,292