v3.26.3
Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Income Tax Disclosure [Line Items]        
Provision for income taxes $ 11,712 $ 8,722 $ 27,514 $ 20,793
Non-cash deferred tax benefit (6,565) $ 4,227 619 $ 9,864
Outside Kiniksa US, UK, and Switzerland        
Income Tax Disclosure [Line Items]        
Material deferred tax assets $ 0   $ 0