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Balance Sheets (Parenthetical) (USD $)
Jul. 31, 2013
Jul. 31, 2012
Balance Sheets Parenthetical    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized 100,000,000 100,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares, outstanding 0 0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 200,000,000 200,000,000
Common stock, shares issued 25,305,532 24,709,282
Common stock, shares, outstanding 25,305,532 24,709,282