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Share capital - Stock options additional information (Details)
12 Months Ended
Nov. 30, 2020
$ / shares
shares
Nov. 30, 2020
$ / shares
shares
Nov. 30, 2019
$ / shares
shares
Nov. 30, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Rolling maximum number, percentage of the issued and outstanding Common Shares 10.00% 10.00%    
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 5 years 5 years    
Employees, Consultants And Directors        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options granted | shares 4,445,000 4,445,000 3,077,500 3,077,500
Weighted-average exercise price $ 2.79   $ 2.86  
Stock options granted, weighted average fair value   $ 0.90   $ 1.03
Employees, Consultants And Directors | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 5 years 5 years    
Employees, Consultants And Directors | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 2 years 2 years