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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Income Tax [Line Items]    
Federal statutory rate 21.00% 21.00%
Deferred tax assets increase decrease in the valuation allowance $ 55,896  
Percentage of future taxable income against which net operating loss with no definite period shall be set off 80.00%  
Unrecognized tax benefits accrued interest and penalties $ 192 $ 173
United Kingdom    
Income Tax [Line Items]    
Net operating loss carry forwards 273,143  
Domestic Country [Member]    
Income Tax [Line Items]    
Net operating loss carry forwards 273,444  
Net operating loss carryforwards subject to annual limitation $ 75,361  
Percentage of future taxable income against which net operating loss with definite period shall be set off 100.00%  
Domestic Country [Member] | 2028 to 2037 [Member]    
Income Tax [Line Items]    
Net operating loss carry forwards $ 103,081  
Domestic Country [Member] | Indefinitely [Member]    
Income Tax [Line Items]    
Net operating loss carry forwards 170,363  
Domestic Country [Member] | 2035 to 2045 [Member]    
Income Tax [Line Items]    
Tax credit carryforward 8,643  
Tax credit carryforwards subject to annual limitation 1,774  
State and Local Jurisdiction [Member]    
Income Tax [Line Items]    
Tax credit carryforward 3,095  
State and Local Jurisdiction [Member] | Indefinitely [Member]    
Income Tax [Line Items]    
Tax credit carryforward 2,901  
State and Local Jurisdiction [Member] | 2027 through 2045 [Member]    
Income Tax [Line Items]    
Net operating loss carry forwards 24,368  
State and Local Jurisdiction [Member] | 2029 to 2040 [Member]    
Income Tax [Line Items]    
Tax credit carryforward $ 194