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Share capital - Additional information (Details)
$ / shares in Units, $ in Thousands, $ in Thousands
 12 Months Ended
Jun. 14, 2023
USD ($)
shares
Jun. 14, 2023
CAD ($)
$ / shares
shares
Jun. 07, 2023
USD ($)
shares
Jun. 07, 2023
CAD ($)
$ / shares
shares
Jun. 06, 2023
CAD ($)
shares
Mar. 14, 2022
USD ($)
shares
Mar. 14, 2022
CAD ($)
shares
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 06, 2023
USD ($)
Jun. 06, 2023
CAD ($)
$ / shares
Apr. 30, 2022
shares
Mar. 31, 2022
shares
Mar. 14, 2022
$ / shares
Disclosure of classes of share capital [line items]                            
Issuance of common shares, net of issuance costs | $               $ 168,664 $ 14,101          
Equity funding commitment per facility   20.00%                        
Warrants exercised during the period (in shares) | shares                         1,250,000  
Warrants expired during period (in shares) | shares                         500,000  
Triangle Deposit Ramp Development                            
Disclosure of classes of share capital [line items]                            
Premium value (CDN per share)                           $ 2.00
Ordinary shares                            
Disclosure of classes of share capital [line items]                            
Number of shares issued (in shares) | shares                       19,037    
Private Placement                            
Disclosure of classes of share capital [line items]                            
Number of shares issued during period (in shares) | shares 6,269,231 6,269,231 10,400,000 10,400,000   442,700 442,700              
Value of shares issued during period (CDN per share)   $ 13.00   $ 13.00                   18.07
Issuance of common shares, net of issuance costs $ 61,292 $ 81,500 $ 101,076 $ 135,200   $ 6,378 $ 8,000              
Payments for share issue costs | $ $ 1,400                          
Premium value (CDN per share)                           4.19
Premium value           $ 1,880       $ 2,635 $ 3,536      
Private Placement | Triangle Deposit Ramp Development                            
Disclosure of classes of share capital [line items]                            
Number of shares issued during period (in shares) | shares           251,800 251,800              
Value of shares issued during period (CDN per share)                           $ 15.88
Issuance of common shares, net of issuance costs           $ 3,189 $ 4,000              
Private Placement One                            
Disclosure of classes of share capital [line items]                            
Number of shares issued during period (in shares) | shares         390,900                  
Value of shares issued during period (CDN per share)                     $ 19.18      
Issuance of common shares, net of issuance costs | $         $ 7,498                  
Premium value (CDN per share)                     6.02      
Private Placement Two                            
Disclosure of classes of share capital [line items]                            
Number of shares issued during period (in shares) | shares         290,000                  
Value of shares issued during period (CDN per share)                     17.24      
Issuance of common shares, net of issuance costs | $         $ 4,998                  
Premium value (CDN per share)                     $ 4.08