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Performance B.4.3. Directors and executive management (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Employee Benefits Expense [Line Items]      
Remuneration charge for the Board (gross of withholding tax) $ 1,018 $ 1,300 $ 1,675
Shares beneficially owned by the Directors 59,073 47,473  
Remuneration charge (in shares) 14,500 39,606 42,141
Remuneration expense, percent shares 41.00% 58.00% 75.00%
Remuneration expense, percent cash 59.00% 42.00% 25.00%
Classes of employee benefits expense:      
Base salary $ 358,000 $ 421,000 $ 463,000
Pension 2,000 3,000 3,000
Other benefits 19,000 17,000 24,000
Share based compensation 14,000 50,000 52,000
Employee benefits expense $ 452,000 $ 553,000 614,000
Shares awards vested (in shares) 434,675 270,850  
Shares not yet vested (in shares) 502,914 474,225  
Chairperson      
Employee Benefits Expense [Line Items]      
Remuneration charge for the Board (gross of withholding tax) $ 250 $ 0 315
Shares beneficially owned by the Directors 0 0  
Other non-executive directors of the Board      
Employee Benefits Expense [Line Items]      
Remuneration charge for the Board (gross of withholding tax) $ 768 $ 1,300 1,360
Shares beneficially owned by the Directors 59,073 47,473  
Group Leadership Team      
Classes of employee benefits expense:      
Base salary $ 3,427 $ 5,040 4,903
Bonus 5,446 13,230 3,267
Pension 623 1,042 1,194
Other benefits 1,676 635 529
PCA (2025) / MSU (2024) 0 1,169 0
Termination benefits 4,036 4,940 804
Total before share based compensation 15,208 26,056 10,696
Share based compensation 5,371 16,277 21,663
Employee benefits expense $ 20,579 $ 42,332 $ 32,359