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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Prepaid Expenses and Other Current Assets    
Prepaid research and development expenses $ 2,464,441 $ 3,838,835
Other prepaid expenses 306,680 301,534
Other receivables 1,672 185,953
Prepaid expenses and other current assets $ 2,772,793 $ 4,326,322