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Related party transactions (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Nov. 26, 2018
Disclosure of transactions between related parties [line items]                
Royalty expense       $ 1,600 $ 2,400      
Other expense   $ 45 $ 45 94 95      
Right-of-use assets   3,946 6,553 3,946 6,553 $ 4,308 $ 7,071  
Lease liabilities   4,340 6,816 4,340 6,816 4,673 $ 7,577  
Payments       665 1,395      
Interest expenses       118 210      
4.6% Senior Notes                
Disclosure of transactions between related parties [line items]                
Borrowings, interest rate               4.60%
4.6% Senior notes with related party   36,862   36,862   34,014    
Accrued interest on 4.6% Senior Notes with related party $ 9,600              
Interest expense   409 411 799 843      
Controlling shareholder                
Disclosure of transactions between related parties [line items]                
Royalty expense   408 622 854 1,241      
Other expense   1,624 1,194 3,417 2,319      
Accounts payable and accrued expenses   1,737   1,737   1,958    
Other receivables   4   4   3    
Right-of-use assets   2,102   2,102   2,238    
Lease liabilities   2,222   2,222   2,335    
Payments   174 313 343 636      
Interest expenses   $ 25 $ 75 $ 50 $ 156      
Controlling shareholder | 4.6% Senior Notes                
Disclosure of transactions between related parties [line items]                
Borrowings, interest rate   4.60%   4.60%        
4.6% Senior notes with related party   $ 36,862   $ 36,862   34,014    
Accrued interest on 4.6% Senior Notes with related party       $ 1,855   $ 936