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Liability for cash-settled share-based payments - Description of share-based payment arrangements (Details)
$ in Thousands
12 Months Ended
Jun. 06, 2023
shares
Dec. 31, 2023
USD ($)
shares
Liability for cash-settled share-based payments    
Liability for cash-settled share-based payments | $   $ 3,193
12 months    
Liability for cash-settled share-based payments    
Eligible to vest   33.33%
24 months    
Liability for cash-settled share-based payments    
Eligible to vest   33.33%
36 months    
Liability for cash-settled share-based payments    
Eligible to vest   33.33%
DSU    
Liability for cash-settled share-based payments    
Granted shares | shares 50,900  
Liability for cash-settled share-based payments | $   $ 629
PSU    
Liability for cash-settled share-based payments    
Granted shares | shares 212,965  
Liability for cash-settled share-based payments | $   $ 664
PSU | 25th percentile    
Liability for cash-settled share-based payments    
Eligible to vest   0.00%
PSU | Greater than 25th percentile    
Liability for cash-settled share-based payments    
Eligible to vest   50.00%
PSU | Greater than 50th percentile    
Liability for cash-settled share-based payments    
Eligible to vest   100.00%
PSU | Greater than 75th percentile    
Liability for cash-settled share-based payments    
Eligible to vest   175.00%
PSU | Greater than 90th percentile    
Liability for cash-settled share-based payments    
Eligible to vest   225.00%
RSU    
Liability for cash-settled share-based payments    
Granted shares | shares 470,603  
Forfeited shares | shares 15,000 455,603
Liability for cash-settled share-based payments | $   $ 1,900