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Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Accrued Expenses    
Accrued research and development expenses $ 4,151,902 $ 5,149,697
Accrued bonuses 2,348,091 2,677,288
Accrued consulting and other professional fees 348,798 320,935
Accrued employee benefits 760,824 351,966
Other accrued expenses 260,972 210,904
Accrued expenses $ 7,870,587 $ 8,710,790