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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Prepaid Expenses and Other Current Assets
Prepaid research and development expenses	$ 1,634,771	$ 3,838,835
Other prepaid expenses	332,273	301,534
Other receivables	91,637	185,953
Prepaid expenses and other current assets	$ 2,058,681	$ 4,326,322

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