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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Tax Disclosure [Line Items]      
Bermuda statutory income tax rate 25.00% 25.00%  
Income tax benefits - Bermuda $ 22,316    
Net operating loss carryforwards - Bermuda 0    
Non-cash deferred tax benefit 13,002 $ 8,132 $ (33,788)
Material deferred tax assets 866,908 $ 879,117  
Outside Kiniksa US, UK, and Switzerland      
Income Tax Disclosure [Line Items]      
Material deferred tax assets $ 0    
Bermuda      
Income Tax Disclosure [Line Items]      
Bermuda statutory income tax rate 0.00%    
Income tax benefits - Bermuda $ 0    
Net operating loss carryforwards - Bermuda $ 0