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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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