Income Taxes - Schedule of Components of Net Loss Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
U.K.	$ (156,000)	$ (147,337)
Non-U.K.	2,966	3,581
Net loss before income tax	$ (153,034)	$ (143,756)