Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current income tax provision
United Kingdom	$ 0	$ 0	$ 0
Foreign	1,865	744	253
Total current expense:	1,865	744	253
Deferred income tax benefit:
United Kingdom	0	0	0
Foreign	(1,457)	(545)	(221)
Total deferred income tax benefit:	(1,457)	(545)	(221)
Total provision for income taxes	$ 408	$ 199	$ 32