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Components of Preferred Stock as Temporary Equity (Detail) (Redeemable Preferred Stock, USD $)
Jun. 30, 2014
Dec. 31, 2013
Redeemable Preferred Stock
   
Temporary Equity [Line Items]    
10% convertible preferred stock - face value $ 6,946,230 $ 6,946,230
Unamortized discount 0 (221,386)
10% convertible preferred stock, net of discount $ 6,946,230 $ 6,724,844