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Segment information - Long-Lived Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Segment Reporting Information [Line Items]    
Long-lived assets $ 19,449 $ 33,704
United States    
Segment Reporting Information [Line Items]    
Long-lived assets 19,449 28,907
United Kingdom    
Segment Reporting Information [Line Items]    
Long-lived assets $ 0 $ 4,797