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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Prepaid Expenses and Other Current Assets    
Prepaid research and development expenses $ 2,947,105 $ 2,941,196
Other prepaid expenses 377,597 251,733
Other receivables 152,583 101,955
Prepaid expenses and other current assets $ 3,477,285 $ 3,294,884