Quarterly report pursuant to Section 13 or 15(d)

Assumptions used to determine fair value of derivative warrant liability upon settlement of derivative liability (Details)

v3.22.2.2
Assumptions used to determine fair value of derivative warrant liability upon settlement of derivative liability (Details) - Derivatives Assumptions Used [Member]
3 Months Ended
Jul. 31, 2022
Jul. 31, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum 2.83% 2.87%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum   0.52%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term 3 years 2 months 1 day 3 years 5 months 1 day
[custom:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm2] 3 years 6 months 4 years 6 months
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum 225.77% 211.02%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum 235.23% 292.28%