Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Schedule of Assumptions Used to Calculate Fair Value of Stock Based Compensation (Details)

v3.20.2
Stock-Based Compensation - Schedule of Assumptions Used to Calculate Fair Value of Stock Based Compensation (Details)
12 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Risk-free interest rate, minimum 0.30% 1.74%
Risk-free interest rate, maximum 1.70% 3.09%
Volatility, minimum 80.93% 72.88%
Volatility, maximum 87.95% 83.87%
Dividend yield 0.00% 0.00%
Minimum [Member]    
Expected term (years) 5 years 5 years
Maximum [Member]    
Expected term (years) 6 years 6 months 6 years 6 months