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Segment Reporting - Long-lived assets by geography (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 6,062 $ 5,081
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 808 2,517
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 5,254 $ 2,564