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Segment information - Long-Lived Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Segment Reporting [Line Items] |  |
Long-lived assets | $ 17,701 | $ 19,449
United States |  |
Segment Reporting [Line Items] |  |
Long-lived assets | 17,701 | 19,449
United Kingdom |  |
Segment Reporting [Line Items] |  |
Long-lived assets | $ 0 | $ 0

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