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Segment Reporting - Long-lived assets by geography (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 3,484 $ 1,279
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 2,762 1,228
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 722 $ 51