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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Prepaid Expenses and Other Current Assets
Prepaid research and development expenses	$ 1,594,492	$ 1,608,768
Other prepaid expenses	394,006	329,634
Other receivables	313,112	413,122
Prepaid expenses and other current assets	$ 2,301,610	$ 2,351,524

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