Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Details 2)

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Stock-Based Compensation (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2012
Jun. 24, 2011
Additional disclosures        
Weighted-average grant date fair value (in dollars per share) $ 0.47 $ 0.14 $ 0.18  
Unrecognized non-cash compensation cost $ 2.5      
Weighted average period for recognition of unrecognized non-cash compensation cost 2 years 4 months 10 days      
Common Stock options outstanding (within the 2011 Plan and outside of the terms of the 2011 Plan) (in shares) 11,760,900 5,150,000 3,175,000  
Common Stock warrants (in shares) 37,647,790     12,000,000
Common Stock options authorized for future grant under the 2011 Plan (in shares) 16,372,625      
Common Stock Reserved for Future Issuance 65,781,315      
$0.18 - 0.805
        
Stock option activity by range of exercise prices        
Exercise price, low end of the range (in dollars per share) $ 0.18      
Exercise price, high end of the range (in dollars per share) $ 0.805      
Number of Shares Outstanding 11,760,900      
Weighted Average Contractual Life 8 years 6 months 4 days      
Number of Shares Exercisable 6,022,353      
Weighted Average Remaining Contractual Life 7 years 7 months 10 days