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Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Accrued Expenses    
Research and development costs $ 5,271 $ 8,059
Professional fees 1,118 1,439
Payroll related 3,091 3,655
Other 160 377
Accrued expenses $ 9,640 $ 13,530