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Summary of significant accounting policies - Inventory (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Accounting Policies [Abstract] |  |  |  |
Raw materials | $ 2,244 | $ 2,244 |  | $ 2,538
Work in progress | 41,827 | 41,827 |  | 12,216
Finished goods | 8,617 | 8,617 |  | 8,440
Total inventory | 52,688 | 52,688 |  | $ 23,194
Inventory write-down | $ 500 | $ 4,800 | $ 2,500 |

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