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Stock-Based Compensation (Tables)
3 Months Ended
Oct. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Common stock options granted, forfeited or expired and exercised
    Options   Weighted Average Exercise Price per Share
Outstanding - July 31, 2018     232,218     $ 1.46  
Granted     2,730,000       0.11  
Forfeited or expired     (214,638 )     (0.05 )
Exercised     —         —    
Outstanding - October 31, 2018     2,747,580     $ 0.28  
Fair value assumptions used in Black-Scholes option-pricing
    October 31,
2018
Exercise price     0.106  
Time to expiration     10 years  
Risk-free interest rate     3.15 %
Estimated volatility     151.3 %
Dividend     —    
Stock price at valuation date   $ 0.106  
Information on stock options outstanding
          Options Outstanding and Options Exercisable
  Range of Exercise Price       Number Outstanding at October 31, 2018       Weighted Average Exercise Price       Weighted Average Remaining Life (Years)       Aggregate Intrinsic Value  
$ 0.11       2,730,000     $ 0.11       9.93     $ 1,119,400  
$ 30.48       17,850     $ 30.48       1.35       —    
          2,747,850       5.95       9.88     $ 1,119,400