Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets [Line Items]
UK R&D tax credit	$ 20,712	$ 27,877
Prepaid research and development	11,332	6,826
Prepaid income tax	197	1,123
VAT recoverable	1,109	1,052
Prepaid insurance premium	280	1,885
Other current assets	2,191	1,895
Prepaid expenses and other current assets	35,821	$ 40,658
2022 R&D tax credit
Deferred Costs, Capitalized, Prepaid, and Other Assets [Line Items]
R&D tax credit	14,900
2023 R&D tax credit
Deferred Costs, Capitalized, Prepaid, and Other Assets [Line Items]
R&D tax credit	$ 13,600