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Stockholder's Equity (Details Textuals) (USD $)
 0 Months Ended
Mar. 08, 2012
Jul. 31, 2012
Jul. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock, reserved for issuance of stock options   18,170,575 19,651,848
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   124,393,700 132,011,034
Common stock, shares issued   124,393,700 132,011,034
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 outstanding        
Preferred stock, shares issued        
Stock split ratio two-for-one    
Employee Stock Purchase Plan (ESPP)
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock, reserved for issuance of stock options   1,325,651 1,423,420