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Black-Scholes Pricing Model Assumptions to Determine Fair Value of Placement Agent Warrants (Detail1) (Placement Agent Warrants [Member])
0 Months Ended 1 Months Ended 6 Months Ended
Aug. 09, 2013
May 17, 2013
Jun. 30, 2013
Placement Agent Warrants [Member]
     
Stockholders Equity [Line Items]      
Risk-free interest rate 2.53% 1.35% 1.58%
Expected life 4 years 4 years 4 years
Expected volatility 146.19% 144.63% 145.62%
Dividend Yield 0.00% 0.00% 0.00%