Annual report pursuant to section 13 and 15(d)

Significant Accounting Policies (Details 2)

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Significant Accounting Policies (Details 2) (USD $)
12 Months Ended 54 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2012
Stock options to non-employees      
Stock-based compensation expense recognized $ 249,000 $ 83,000 $ 332,000
Research and development expense | Non-employees
     
Stock options to non-employees      
Stock-based compensation expense recognized 25,000    
General and administrative expense | Non-employees
     
Stock options to non-employees      
Stock-based compensation expense recognized $ 133,000