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Stock-Based Compensation (Tables)
6 Months Ended
Jan. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Common stock options granted, forfeited or expired and exercised

The following is a summary of the common stock options granted, forfeited or expired and exercised under the Plan:

    Options   Weighted Average Exercise Price per Share
Outstanding - July 31, 2018     232,218     $ 1.46  
Granted     6,220,625       0.47  
Forfeited or expired     (214,371 )     (0.05 )
Exercised     —         —    
Outstanding - January 31, 2019     6,238,472     $ 0.56  
Fair value assumptions used in Black-Scholes option-pricing

The following assumptions were used in the Black-Scholes option-pricing model:

      January 31,
2019
 
Exercise price     $0.64 - 1.08  
Time to expiration     10 years  
Risk-free interest rate     2.56% - 3.14%  
Estimated volatility     135.2% - 143.1%  
Dividend     —    
Stock price at valuation date     $0.64 - 1.08  
Information on stock options outstanding

The following table summarizes information on stock options outstanding at January 31, 2019:

          Options Outstanding and Options Exercisable
  Range of Exercise Price       Number Outstanding at January 31, 2019       Weighted Average Exercise Price       Weighted Average Remaining Life (Years)       Aggregate Intrinsic Value  
$ 0.11       2,730,000     $ 0.05       9.68     $ 5,525,000  
  0.64       1,328,125       0.14       9.76       1,978,906  
  0.78       1,712,500       0.21       9.87       2,311,875  
  0.92       200,000       0.03       9.92       242,000  
  1.08       250,000       0.04       9.93       262,500  
  30.48       17,850       0.09       1.10       —    
          6,238,475     $ 0.56       9.74     $ 10,320,281