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Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]    
Accrued research and development expenses $ 828 $ 1,296
Accrued employee bonus compensation 365 1,798
Other accrued expenses 599 707
Total accrued expenses $ 1,792 $ 3,801