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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Prepaid Expenses and Other Current Assets
Prepaid research and development expenses	$ 2,122,098	$ 1,608,768
Other prepaid expenses	352,760	329,634
Other receivables	354,101	413,122
Prepaid expenses and other current assets	$ 2,828,959	$ 2,351,524

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