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Share-based payment arrangements - Description of share-based payment arrangements (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Nov. 22, 2023
shares
Nov. 22, 2023
T
Apr. 01, 2023
shares
Apr. 01, 2023
T
Apr. 01, 2022
shares
Apr. 01, 2021
shares
Apr. 01, 2020
shares
Jan. 31, 2022
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
shares
Dec. 31, 2023
T
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Expense from share-based payment transactions with employees                 $ 0 $ 3,945     $ 2,411  
Number of options granted (in shares) | shares                         0 0
Long term incentive plan 2015 | Key management personnel of entity or parent                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Expense from share-based payment transactions with employees                         $ 1,800  
Long term incentive plan 2018 | Key management personnel of entity or parent | Phantom stock units                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Expense from share-based payment transactions with employees                         600  
Transaction based incentive plan 2019 | Phantom stock units                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Expense from share-based payment transactions with employees                         7,400  
Long term incentive plan 2019 (equity settled)                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Expense from share-based payment transactions with employees                         $ 600  
Long term incentive plan 2019 (equity settled) | Key management personnel of entity or parent | Restricted stock units                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Number of options vested (in shares) | shares                         105,626  
Long term incentive plan 2020                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Expense from share-based payment transactions with employees                   200     $ 400  
Long term incentive plan 2020 | Key management personnel of entity or parent | Restricted stock units                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Number of options vested (in shares) | shares                     88,127      
Number of options granted (in shares) | shares             144,392              
Long term incentive plan 2021                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Expense from share-based payment transactions with employees               $ 700   800        
Long term incentive plan 2021 | Key management personnel of entity or parent | Restricted stock units                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Number of options vested (in shares) | shares 52,585   14,530   64,414           131,529      
Number of options granted (in shares) | shares           193,387                
Long term incentive plan 2022                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Expense from share-based payment transactions with employees                   1,300        
Long term incentive plan 2022 | Key management personnel of entity or parent | Restricted stock units                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Number of options vested (in shares) 98,527 98,527 12,203 12,203             110,730 110,730    
Number of options granted (in shares) | shares         163,022                  
Long term incentive plan 2023                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Expense from share-based payment transactions with employees                   $ 1,600        
Long term incentive plan 2023 | Key management personnel of entity or parent | Restricted stock units                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Number of options granted (in shares) | shares     120,079               120,079