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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]    
Accrued clinical trial costs $ 1,919 $ 9,866
Accrued payroll and bonus expenses 838 1,207
Accrued manufacturing expenses 136 136
Accrued other expenses 1,055 1,249
Total $ 3,948 $ 12,458