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Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Accrued Expenses    
Accrued research and development expenses $ 4,769,711 $ 5,114,420
Accrued bonuses 2,002,407 3,341,184
Accrued consulting and other professional fees 380,181 194,760
Accrued employee benefits 785,276 569,048
Other accrued expenses 187,966 220,469
Accrued expenses $ 8,125,541 $ 9,439,881