v3.25.2
Fair value measurement - Copper stream embedded derivative, key inputs were used (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair value measurement    
Percentage of assets 5.00%  
Percentage of possible decrease in unobservable assets 5.00%  
Copper stream embedded derivative | Spot price    
Fair value measurement    
Significant unobservable input, asset 10,040 8,653
Percentage of liabilities 5.00%  
Increase in fair value measurement liabilities $ 4,695  
Percentage of possible decrease in unobservable liabilities 5.00%  
Decrease in fair value measurement liabilities $ 4,741  
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets   $ 4,488
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input, assets   $ 4,525
Copper stream embedded derivative | Price volatility    
Fair value measurement    
Significant unobservable input, asset 21.55 23.55
Copper stream embedded derivative | Own credit spread    
Fair value measurement    
Significant unobservable input, asset 9 8.67