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Fair Value Assumptions Used in Accounting for Derivative Additional Investment Rights Liability - Derivative Liabilities (Details 2) (USD $)
12 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jun. 04, 2013
Mar. 05, 2013
Feb. 05, 2013
Jun. 06, 2012
Current exercise price of warrants $ 0.03 $ 0.15        
Time to expiration 3 years 6 months 3 years 10 months 24 days        
Risk-free interest rate 0.49% 0.45%        
Estimated volatility 85.00% 85.00%        
Dividend 0.00% 0.00%        
Stock price $ 0.035 $ 0.093 $ 0.0325 $ 0.034 $ 0.038 $ 0.0925
Additional Investment Rights
           
Underlying number of units of convertible preferred stock 1,225          
Underlying number of warrants 40,833,335          
Current exercise price of warrants $ 0.03          
Current conversion price of preferred stock $ 0.03          
Time to expiration 10 months 17 days          
Risk-free interest rate 0.11%          
Estimated volatility 114.00%          
Dividend 0.00%          
Stock price $ 0.035