Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Details 2)

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Stock-Based Compensation (Details 2) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
Stock-Based Compensation      
Exercise price, low end of the range (in dollars per share) $ 3.60    
Exercise price, high end of the range (in dollars per share) $ 16.10    
Number of Shares Outstanding 1,148,764    
Weighted Average Contractual Life 8 years 2 months 12 days    
Number of Shares Exercisable 616,511    
Weighted Average Remaining Contractual Life 7 years 3 months 18 days    
Additional disclosures      
Weighted-average grant date fair value (in dollars per share) $ 5.57 $ 9.40 $ 2.80
Unrecognized non-cash compensation cost $ 3.4    
Weighted average period for recognition of unrecognized non-cash compensation cost 1 year 10 months 24 days    
Weighted-average fair value of stock options vested $ 7.12 $ 6.60 $ 3.00
Common Stock options outstanding (within the 2011 Plan and outside of the terms of the 2011 Plan) (in shares) 1,148,764    
Common Stock warrants (in shares) 1,895,102    
Common Stock options authorized for future grant under the 2011 Plan (in shares) 2,652,434    
Common Stock Reserved for Future Issuance 5,696,300