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Long-term investments - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Loss on investments accounted for under the equity method (note 8) | $ (3,197) | $ (3,002) | $ (10,767) | $ (4,104)
Capital contributions to investments accounted for by the equity method investment | $ 10,997 | $ 0 | $ 19,868 | $ 9,900

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