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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Detail) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Prepaid Expenses and Other Current Assets
Prepaid research and development expenses	$ 1,905,307	$ 2,941,196
Other prepaid expenses	387,704	251,733
Other receivables	312,175	101,955
Prepaid expenses and other current assets	$ 2,605,186	$ 3,294,884

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