Annual report pursuant to Section 13 and 15(d)

Derivatives - Assumptions used to determine fair value of remaining derivative liability (Details)

v3.21.2
Derivatives - Assumptions used to determine fair value of remaining derivative liability (Details) - Fair value of remaining derivatives
12 Months Ended
Apr. 30, 2021
$ / shares
Current stock price $ 4.04
Risk-free interest rate, minimum 0.08%
Risk-free interest rate, maximum 0.61%
Expected dividend yield
Expected term, minimum 1 year 6 months 15 days
Expected term, maximum 5 years
Expected volatility, minimum 86.74%
Expected volatility, maximum 110.56%