Annual report pursuant to Section 13 and 15(d)

Income Taxes - Components of (Loss) before Income Taxes (Detail)

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Income Taxes - Components of (Loss) before Income Taxes (Detail) - USD ($)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Income Taxes Disclosure [Line Items]    
Loss before income taxes $ (8,579,246) $ (6,328,340)
U S    
Income Taxes Disclosure [Line Items]    
Loss before income taxes (547,508) (190,025)
G B    
Income Taxes Disclosure [Line Items]    
Loss before income taxes (7,855,509) (5,244,538)
D E    
Income Taxes Disclosure [Line Items]    
Loss before income taxes $ (176,229) $ (893,777)