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)

v3.21.2
Stock-Based Compensation - Schedule of Assumptions Used to Calculate Fair Value of Stock Based Compensation (Details)
12 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Risk-free interest rate, minimum 0.27% 0.30%
Risk-free interest rate, maximum 1.13% 1.70%
Volatility, minimum 85.31% 80.93%
Volatility, maximum 89.08% 87.95%
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