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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Payables And Accruals [Abstract]      
Compensation, excluding taxes $ 3,469 $ 1,785 $ 1,124
Clinical trial expenses 4,289 4,530 869
Interest payable 731 402  
Other 630 1,247 985
Total accrued expenses $ 9,119 $ 7,964 $ 3,408