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Components of Preferred Stock as Temporary Equity (Detail) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Mar. 31, 2014
Temporary Equity [Line Items]      
10% convertible preferred stock - face value $ 6,829,980 $ 6,829,980  
Unamortized discount 0 0 $ (221,386)
10% convertible preferred stock, net of discount $ 6,829,980 $ 6,829,980