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Benefit plans
12 Months Ended
Dec. 31, 2023
Retirement Benefits [Abstract]  
Benefits plans Benefit plans
The Company maintains a 401(k) defined contribution retirement plan in the U.S. and a defined contribution plan in the U.K. for its employees and executive directors. The assets of the plans are held separately from those of the Company in independently administered funds.
The retirement plan cost represents the contributions payable by the Company to the plans during the year. Defined contribution costs during the years ended December 31, 2023 and 2022 amounted to $0.6 million and $0.3 million, respectively.