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Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Payables and Accruals [Abstract]    
Clinical trial costs $ 3,208 $ 3,294
Professional fees 560 435
Compensation and related benefits 935 1,535
Interest expense 0 28
Accrued expenses and other current liabilities $ 4,703 $ 5,292