Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.4
Stock-Based Compensation - Schedule of Assumptions Used to Calculate Fair Value of Stock Based Compensation (Details)
6 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Risk-free interest rate, minimum 0.27% 1.35%
Risk-free interest rate, maximum 0.65% 1.70%
Volatility, minimum 85.31% 80.93%
Volatility, maximum 88.95% 83.66%
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