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Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Accrued Expenses    
Accrued research and development expenses $ 5,824,365 $ 5,114,420
Accrued bonuses 2,152,302 3,341,184
Accrued consulting and other professional fees 299,607 194,760
Accrued employee benefits 348,752 569,048
Other accrued expenses 90,342 220,469
Accrued expenses $ 8,715,368 $ 9,439,881