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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