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Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Accrued Expenses    
Accrued research and development expenses $ 5,280,150 $ 5,114,420
Accrued bonuses 1,323,377 3,341,184
Accrued consulting and other professional fees 306,298 194,760
Accrued employee benefits 761,195 569,048
Other accrued expenses 106,898 220,469
Accrued expenses $ 7,777,918 $ 9,439,881