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Warrants - Schedule of Warrant Details (Details) - $ / shares
12 Months Ended
May 31, 2021
May 31, 2020
May 31, 2019
Class Of Warrant Or Right [Line Items]      
Number of warrants 12,203,651 5,994,651 1,903,024
Weighted average price $ 7.41 $ 8.91 $ 12.01
Warrant Expiring September 26, 2021      
Class Of Warrant Or Right [Line Items]      
Type of warrant Warrant    
Classification Equity    
Warrant expiry date Sep. 26, 2021    
Number of warrants 166,000    
Weighted average price $ 3.14    
Warrant Expiring January 30, 2022      
Class Of Warrant Or Right [Line Items]      
Type of warrant Warrant    
Classification Equity    
Warrant expiry date Jan. 30, 2022    
Number of warrants 5,828,651    
Weighted average price $ 9.26    
Warrant Expiring March 17, 2025      
Class Of Warrant Or Right [Line Items]      
Type of warrant Warrant    
Classification Liability    
Warrant expiry date Mar. 17, 2025    
Number of warrants 6,209,000    
Weighted average price $ 5.95