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Income Tax - Components of loss before income taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]    
United Kingdom $ (72,244) $ (51,197)
United States (16,358) (1,713)
Loss before income tax $ (88,602) $ (52,910)