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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Compensation, excluding taxes $ 3,122 $ 1,785
Clinical trial expenses 4,151 4,530
Other 1,087 1,649
Total accrued expenses $ 8,360 $ 7,964