Quarterly report pursuant to sections 13 or 15(d)

Significant Accounting Policies (Details 3)

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Significant Accounting Policies (Details 3) (USD $)
3 Months Ended 57 Months Ended 3 Months Ended
Oct. 31, 2011
Oct. 31, 2012
Oct. 31, 2012
Research and development expense
Non-employees
Oct. 31, 2012
General and administrative expense
Non-employees
Stock options to non-employees        
Stock-based compensation expense recognized $ 83,000 $ 332,000 $ 6,000 $ 135,000