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Warrants - Schedule of Warrants Outstanding (Details) - $ / shares
 12 Months Ended
May 31, 2021
May 31, 2020
Warrants And Rights Note Disclosure [Abstract]    
Outstanding, beginning of the year, Number of warrants 5,994,651 1,903,024
Exercised during the year, Number of warrants   (636,089)
Issued during the year,Number of warrants 6,209,000 5,828,652
Expired during the year,Number of warrants   (1,100,936)
Outstanding, end of the year, Number of warrants 12,203,651 5,994,651
Outstanding, beginning of the year, weighted average price $ 8.91 $ 12.01
Exercised during the year, weighted average price   1.47
Issued during the year, weighted average price 5.95 9.08
Expired during the year, weighted average price   19.46
Outstanding, end of the year, weighted average price $ 7.41 $ 8.91