Digital assets - Digital Assets (Gains)/Losses and Impairment (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]
(Gains)/losses on disposals of digital assets	$ 0	$ (23)
Unrealized (gains)/losses on changes in fair value of digital assets	856	6,293
Total	$ 856	$ 6,270

Amount of realized and unrealized gain (loss) from remeasurement of crypto asset, classified as operating. Excludes crypto asset held for platform user.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 60
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476163/350-60-45-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 60
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476162/350-60-50-2

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Amount of realized gain (loss) from remeasurement of crypto asset, classified as operating. Excludes crypto asset held for platform user.

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Amount of unrealized gain (loss) from remeasurement of crypto asset, classified as operating. Excludes crypto asset held for platform user.

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