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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Compensation, excluding taxes $ 3,469 $ 1,785
Clinical trial expenses 4,289 4,530
Interest payable 731 402
Other 630 1,247
Total accrued expenses $ 9,119 $ 7,964