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Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Accrued Expenses    
Accrued research and development expenses $ 4,558,927 $ 5,114,420
Accrued bonuses 1,695,665 3,341,184
Accrued consulting and other professional fees 235,330 194,760
Accrued employee benefits 641,705 569,048
Other accrued expenses 163,538 220,469
Accrued expenses $ 7,295,165 $ 9,439,881