Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Summary of Stock Option Activity (Details)

v3.10.0.1
Stock-Based Compensation - Summary of Stock Option Activity (Details) - $ / shares
12 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Options Outstanding, Beginning Balance 3,639,613 3,263,460
Options, Granted 6,286,500 3,028,536
Options, Exercised (252,270) (7,500)
Options, Forfeited/Cancelled/Expired (761,123) (2,644,883)
Options Outstanding, Ending Balance 8,912,720 3,639,613
Options Exercisable, Ending Balance 5,674,496  
Weighted Average Exercise Price, Outstanding Beginning Balance $ 1.94 $ 5.88
Weighted Average Exercise Price, Granted 1.38 1.41
Weighted Average Exercise Price, Exercised 1.27 1.29
Weighted Average Exercise Price, Forfeited/Cancelled 2.66 6.21
Weighted Average Exercise Price, Outstanding Ending Balance 1.50 $ 1.94
Weighted Average Exercise Price, Exercisable Ending Balance $ 1.55