Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Unaudited) (Details)

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Quarterly Financial Data (Unaudited) (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended 78 Months Ended
Jul. 31, 2014
Apr. 30, 2014
Jan. 31, 2014
Oct. 31, 2013
Jul. 31, 2013
Apr. 30, 2013
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2008
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Jul. 31, 2009
Jul. 31, 2014
Quarterly Financial Data (Unaudited)                                
Total operating expenses $ (3,543,357) $ (3,816,030) $ (2,601,780) $ (1,988,493) $ (1,760,475) $ (1,709,178) $ (1,597,843) $ (1,997,476)                
Loss from operations (3,543,357) (3,816,030) (2,601,780) (1,988,493) (1,760,475) (1,709,178) (1,597,843) (1,997,476)   (11,949,660) (7,064,972) (5,527,174)       (26,305,340)
Net loss (3,543,357) (3,816,844) (2,600,429) (2,051,486) (1,772,615) (1,728,659) (1,621,988) (2,026,925)                
Net loss applicable to common stockholders $ (3,543,357) $ (3,816,844) $ (2,600,429) $ (2,051,486) $ (1,772,615) $ (1,728,659) $ (1,621,988) $ (2,026,925) $ (7,187) $ (12,012,117) $ (7,150,187) $ (2,364,852) $ (3,758,817) $ (36,158) $ (33,714) $ (25,363,032)
Basic and diluted net loss per share (in dollars per share) $ 0.02 $ 0.02 $ 0.01 $ 0.01 $ 0.02 $ 0.01 $ 0.02 $ 0.02   $ 0.06 $ 0.07 $ 0.04