Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Loss Before Income Taxes (Detail)

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Income Taxes - Schedule of Loss Before Income Taxes (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Domestic $ (8,724,628) $ (7,563,300)
Foreign (13,912,568) (6,291,475)
Loss before income taxes $ (22,637,196) $ (13,854,775)