Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Unaudited) (Details)

v3.3.0.814
Quarterly Financial Data (Unaudited) (Details)
3 Months Ended 12 Months Ended 90 Months Ended
May. 18, 2015
Jul. 31, 2015
USD ($)
$ / shares
Apr. 30, 2015
USD ($)
$ / shares
Jan. 31, 2015
USD ($)
$ / shares
Oct. 31, 2014
USD ($)
$ / shares
Jul. 31, 2014
USD ($)
$ / shares
Apr. 30, 2014
USD ($)
$ / shares
Jan. 31, 2014
USD ($)
$ / shares
Oct. 31, 2013
USD ($)
$ / shares
Jul. 31, 2015
USD ($)
$ / shares
Jul. 31, 2014
USD ($)
$ / shares
Jul. 31, 2013
USD ($)
$ / shares
Jul. 31, 2015
USD ($)
Quarterly Financial Data (Unaudited)                          
Total operating expenses   $ (6,576,413) $ (5,986,286) $ (4,618,237) $ (4,060,206) $ (3,543,358) $ (3,816,030) $ (2,601,780) $ (1,988,493)        
Loss from operations   (6,576,413) (5,986,286) (4,618,237) (4,060,206) (3,543,358) (3,816,030) (2,601,780) (1,988,493) $ (21,241,142) $ (11,949,660) $ (7,064,972)  
Net loss   (6,576,413) (5,987,345) (4,618,237) (4,061,116) (3,543,358) (3,816,844) (2,600,429) (2,051,486)        
Net loss applicable to common stockholders   $ (6,576,413) $ (5,987,345) $ (4,618,237) $ (4,061,116) $ (3,543,358) $ (3,816,844) $ (2,600,429) $ (2,051,486) $ (21,243,111) $ (12,012,117) $ (7,150,187) $ (46,606,143)
Basic and diluted net loss per share (in dollars per share) | $ / shares [1]   $ 0.48 $ 0.48 $ 0.38 $ 0.33 $ 0.30 $ 0.37 $ 0.29 $ 0.28 $ 1.67 $ 1.26 $ 1.34  
Reverse stock split ratio 0.05                        
[1] See Note 1, “Reverse Stock Split”