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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Prepaid Expenses and Other Current Assets    
Prepaid research and development expenses $ 1,749,697 $ 965,504
Other prepaid expenses 458,251 270,675
Other receivables 1,443 2,149
Prepaid expenses and other current assets $ 2,209,391 $ 1,238,328