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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Prepaid Expenses and Other Current Assets    
Prepaid research and development expenses $ 413,190 $ 965,504
Other prepaid expenses 380,485 270,675
Other receivables 444,568 2,149
Prepaid expenses and other current assets $ 1,238,243 $ 1,238,328