Annual report pursuant to Section 13 and 15(d)

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

v3.22.2
Assumptions used to determine fair value of derivative warrant liability upon settlement of derivative liability (Details) - Derivatives Assumptions Used [Member]
12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum 0.52% 0.08%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum 2.87% 0.61%
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 5 months 1 day 1 year 6 months 14 days
[custom:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm2] 4 years 6 months 5 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum 211.02% 86.74%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum 292.28% 110.56%