Quarterly report pursuant to Section 13 or 15(d)

The estimated fair value of stock options granted to employees and consultants during the nine months ended January 31, 2022 and 2021, were calculated using the Black-Scholes option-pricing model using the following assumptions: (Details)

v3.22.0.1
The estimated fair value of stock options granted to employees and consultants during the nine months ended January 31, 2022 and 2021, were calculated using the Black-Scholes option-pricing model using the following assumptions: (Details)
9 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Dividend yield 0.00% 0.00%
Minimum [Member] | Employees and Consultants [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected Term (in years) 3 years 6 months  
Volatility 85.53%  
Risk-free interest rate 1.01%  
Maximum [Member] | Employees and Consultants [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected Term (in years) 6 years 2 months 30 days 6 years 2 months 30 days
Volatility 87.10% 100.10%
Risk-free interest rate 1.07% 0.51%