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Accrued Expenses - Components of Accrued Expenses (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]    
Employee expenses $ 4,341,221 $ 5,810,723
Research and development expenses 6,939,941 1,186,935
Professional fees and other 862,572 605,246
Accrued expenses $ 12,143,734 $ 7,602,904