Warrant Liability - Schedule of Warrants Outstanding (Details) - $ / shares	6 Months Ended
	Nov. 30, 2021	Nov. 30, 2020
Warrants And Rights Note Disclosure [Abstract]
Beginning Balance	12,203,651	5,994,651
Exercised during the period, Number of warrants	0	0
Issued during the period, Number of warrants	0	0
Cancelled during the period, Number of warrants	0	0
Expired during the period, Number of warrants	(166,000)	0
Ending Balance	12,037,651	5,994,651
Outstanding, opening of the period, weighted average price	$ 7.41	$ 8.91
Exercised during the period, weighted average price	0	0
Issued during the period, weighted average price	0	0
Cancelled during the period, weighted average price	0	0
Expired during the period, weighted average price	3.08	0
Outstanding, ending of the period, weighted average price	$ 7.47	$ 8.91