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Employee benefit plans - Additional Information (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Pension asset | $ 273 | $ 354
Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan benefit obligation |  | 26,600
Fair value of plan assets |  | 26,800
Pension asset |  | $ 400
Expected contribution during 2025 | $ 0 |

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