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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Prepaid Expenses and Other Current Assets    
Prepaid research and development expenses $ 2,941,196 $ 59,004
Other prepaid expenses 251,733 140,191
Other receivables 101,955 268,659
Deposits   10,649
Prepaid expenses and other current assets $ 3,294,884 $ 478,503