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Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Accrued Expenses    
Accrued research and development expenses $ 20,038 $ 16,945
Accrued employee compensation and benefits 7,130 7,704
Accrued legal and professional fees 2,857 3,988
Other 291 562
Accrued expenses $ 30,316 $ 29,199