Derivatives (Tables)

12 Months Ended

Apr. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Assumptions used to determine fair value of derivative warrant liability

	April 30, 2021
Risk-free interest rate		0.08-0.61%
Expected dividend yield		—
Expected term (in years)		1.54-5.00
Expected volatility		86.74-110.56 %

Changes in derivative liability

Recognized upon closing of October 2020 financing	$	728,587
Recognized upon closing of January 2021 financing		4,981,701
Eliminated upon conversion of notes/exercise of warrants		(5,390,415	)
Changes in fair value from issuance through April 30, 2021		2,492,894
Derivative liability at April 30, 2021	$	2,812,767

Assumptions used to determine fair value of remaining derivative liability

	April 30, 2021
Current stock price	$	4.04
Risk-free interest rate		0.08-0.61%
Expected dividend yield		—
Expected term (in years)		1.54-5.00
Expected volatility		86.74-110.56 %