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Goodwill and intangible assets - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Dec. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Goodwill and intangible assets
Goodwill impairment losses	$ 0	$ 0	$ 0	$ 0
Goodwill	$ 62,280	62,280		$ 62,280
Amortization of intangible assets		$ 2,468	$ 2,368

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets.

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