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Stockholder's Equity (Details Textuals) - $ / shares
Jul. 31, 2015
Jul. 31, 2014
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract]    
Common stock, shares authorized 180,000,000 180,000,000
Common stock par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares outstanding 120,156,340 126,143,366
Common stock, reserved for issuance of stock options 22,682,820 23,472,855
Common stock, shares issued 120,156,340 126,143,366
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock par value (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Employee Stock Purchase Plan (ESPP)    
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract]    
Common stock, reserved for issuance of stock options 1,097,943 1,158,921