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Income Tax - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating Loss Carryforwards [Line Items]      
Current provision for federal income taxes $ 0 $ 0  
Current provision for state income taxes   0  
Current provision for non-United States income taxes   0  
Deferred provision for federal income taxes 0 0  
Deferred provision for state income taxes 0 0  
Deferred provision for non-United States income taxes 0 0  
Research and experimental expenditures capitalized 73,129,000    
Net adjustment for research and experimental expenditures 65,816,000    
Research and development tax relief 946,000 4,523,000  
Unrecognized tax benefits 1,064,000 0 $ 0
Liability for interest and penalties 0 0  
U.S. Federal      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 48,184,000 $ 11,620,000  
Tax credit carryforward 2,900,000    
U.S. State      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 3,705,000    
Tax credit carryforward 900,000    
U.K.      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards $ 194,454,000