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Black-Scholes Pricing Model Assumptions to Determine Fair Value of Warrants (Detail) (Series A-1 Preferred Stock [Member])
9 Months Ended
Sep. 30, 2013
Series A-1 Preferred Stock [Member]
 
Stockholders Equity [Line Items]  
Risk-free interest rate 1.00%
Expected life 5 years
Expected volatility 142.36%
Dividend yield 0.00%