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Performance B.4.3. Directors and executive management (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Employee Benefits Expense [Line Items]      
Remuneration charge for the Board (gross of withholding tax) $ 1,300 $ 1,675 $ 1,723
Shares beneficially owned by the Directors 47,473 94,718  
Remuneration charge (in shares) 39,606 42,141 41,167
Remuneration expense, percent shares 58.00% 75.00% 73.00%
Remuneration expense, percent cash 42.00% 25.00% 27.00%
Classes of employee benefits expense:      
Base salary $ 421,000 $ 463,000 $ 372,000
Pension 3,000 3,000 2,000
Other benefits 17,000 24,000 22,000
Share based compensation 50,000 52,000 29,000
Employee benefits expense $ 553,000 $ 614,000 494,000
Shares awards vested (in shares) 270,850 719,642  
Shares not yet vested (in shares) 474,225 1,573,187  
Chairperson      
Employee Benefits Expense [Line Items]      
Remuneration charge for the Board (gross of withholding tax) $ 0 $ 315 315
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) $ 1,300 $ 1,360 1,408
Shares beneficially owned by the Directors 47,473 94,718  
Group Leadership Team      
Classes of employee benefits expense:      
Base salary $ 5,040 $ 4,903 5,278
Bonus 13,230 3,267 4,236
Pension 1,042 1,194 1,181
Other benefits 635 529 501
MSU 1,169 0 615
Termination benefits 4,940 804 877
Total before share based compensation 26,056 10,696 12,688
Share based compensation 16,277 21,663 12,069
Employee benefits expense $ 42,332 $ 32,359 $ 24,757