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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Prepaid Expenses and Other Current Assets    
Prepaid expenses $ 940,099 $ 199,195
Other receivables 75,648 268,659
Deposits   10,649
Prepaid expenses and other current assets $ 1,015,747 $ 478,503