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Share capital - Narrative (Details)
3 Months Ended 9 Months Ended
Apr. 25, 2023
USD ($)
$ / shares
shares
Aug. 31, 2023
USD ($)
$ / shares
shares
May 31, 2023
USD ($)
shares
Feb. 28, 2023
USD ($)
shares
Feb. 28, 2023
$ / shares
Aug. 31, 2022
USD ($)
May 31, 2022
USD ($)
shares
Feb. 28, 2022
USD ($)
shares
Feb. 28, 2022
$ / shares
Aug. 31, 2023
USD ($)
$ / shares
shares
Aug. 31, 2022
USD ($)
Aug. 31, 2023
$ / shares
Nov. 30, 2022
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares, conversion                   1      
Non-vested stock options outstanding   12,999,400               12,999,400      
Private placement, net proceeds | $                   $ 3,115,000      
Stock-based compensation | $   $ (393,000) $ (371,000) $ (2,220,000)   $ (571,000) $ (503,000) $ (1,865,000)          
Weighted average exercise price options outstanding | $ / shares   $ 2.16               $ 2.16      
Period for recognition of stock compensation expense                   16 months      
Aggregate intrinsic value, vested options | $   $ 0               $ 0      
Aggregate intrinsic value, options exercised | $                   $ 0 $ 50,000.00    
Share capital                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Common stock committed for issuance   155,559,334               155,559,334     146,225,035
Shares issued for private placement, net of share issue cost (Shares) 5,854,545   5,854,545             5,854,545      
Price per common share | $ / shares $ 0.55                        
Private placement, gross proceeds | $ $ 3,200,000                        
Private placement, net proceeds | $ $ 3,100,000                        
Exercise of options, Number of shares             50,000 31,674          
Nonvested Options                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Non-vested stock options outstanding   2,131,757               2,131,757      
Weighted average exercise price options outstanding | $ / shares                       $ 1.02  
Stock option expense not yet recognized | $   $ 240,000               $ 240,000      
DSUs                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Stock-based compensation | $                   $ 2,000,000.0 1,600,000    
Stock option                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Non-vested stock options outstanding   12,999,400               12,999,400     11,225,400
Weighted average exercise price options outstanding | $ / shares   $ 2.16               $ 2.16     $ 2.49
Exercise of options, Number of shares                   0      
Stock options granted                   3,230,000      
Weighted-average exercise price | $ / shares                   $ 0.78      
Employees, consultants and directors                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Stock options granted, expiration period       5 years                  
Stock options granted   0 0 3,230,000       1,734,500          
Vesting period       2 years                  
Weighted-average exercise price | $ / shares         $ 0.78       $ 2.21        
Stock options granted, weighted average fair value | $ / shares         $ 0.37       $ 0.94        
Directors, employees and service providers                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Stock-based compensation | $                   $ 800,000 $ 1,400,000    
Directors, employees and service providers | NovaGold Arrangement                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares, conversion                   6      
Directors, employees and service providers | NovaGold Arrangement | Nonvested Options                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Non-vested stock options outstanding   5,144               5,144      
Common stock committed for issuance   859               859