Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
3 Months Ended 6 Months Ended 96 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2016
Stockholders' Equity          
Stockholders' equity at beginning of period     $ 32,695,621 $ 38,068,058  
Net loss $ (7,037,720) $ (4,618,237) (14,075,111) (8,679,353) $ (60,700,000)
Public Offering on November 9, 2015, net of issuance costs of $613,915     6,886,095    
Stock-based compensation     3,030,225 1,016,771  
Common stock issued in connection with a contractual agreement     55,500    
Common stock issued for services       30,000  
Exercise of common stock warrants       775,257  
Exercise of common stock options       1,738  
Stockholders' equity at end of period $ 28,592,330 $ 31,212,471 28,592,330 $ 31,212,471 $ 28,592,330
Issuance costs, public offering     $ 613,915