Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses - Schedule of Accrued Expenses (Details)

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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Payables And Accruals [Abstract]    
Accrued clinical trial costs $ 2,025 $ 594
Accrued manufacturing expenses 851 2,031
Accrued payroll and bonus expenses 920 1,059
Accrued other expenses 325 290
Total $ 4,121 $ 3,974