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Derivative financial instruments - Schedule of fair value of derivative instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Offsetting Liabilities [Line Items] |  |
Current assets | $ 550 | $ 1,070
Non-current assets | 236 | 1,267
Net derivative assets (liabilities) | 786 | 2,337
Current assets | 4,206 | 4,063
Non-current assets | 14,575 | 7,205
Current liabilities | (4,206) | (4,063)
Non-current liabilities | (14,575) | (7,205)
Total current position | 550 | 1,070
Total non-current position | 236 | 1,267
Total derivatives | $ 786 | $ 2,337

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