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Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accrued Expenses    
Accrued external research and development expense $ 2,669 $ 3,284
Accrued payroll and related expenses 1,800 2,826
Accrued professional and consulting expense 871 890
Accrued other 244 157
Accrued expenses $ 5,584 $ 7,157