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Risk management activities - Remaining contractual maturities of financial liabilities (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Operating accounts payable $ 11,749
Compensation payable 7,822
Contingent consideration on URNM acquisition 4,470
Lease obligation 2,096
Loan facility 24,237
Non-derivative financial liabilities, undiscounted cash flows 50,374
Less than 1 year  
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Operating accounts payable 11,749
Compensation payable 7,822
Contingent consideration on URNM acquisition 4,470
Lease obligation 765
Loan facility 0
Non-derivative financial liabilities, undiscounted cash flows 24,806
1-3 years  
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Operating accounts payable 0
Compensation payable 0
Contingent consideration on URNM acquisition 0
Lease obligation 1,244
Loan facility 0
Non-derivative financial liabilities, undiscounted cash flows 1,244
4-5 years  
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Operating accounts payable 0
Compensation payable 0
Contingent consideration on URNM acquisition 0
Lease obligation 87
Loan facility 24,237
Non-derivative financial liabilities, undiscounted cash flows 24,324
More than 5 years  
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Operating accounts payable 0
Compensation payable 0
Contingent consideration on URNM acquisition 0
Lease obligation 0
Loan facility 0
Non-derivative financial liabilities, undiscounted cash flows $ 0