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Ordinary Shares (Details) £ / shares in Units, $ / shares in Units, £ in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2024 GBP (£)	Dec. 31, 2025 USD ($) Vote $ / shares shares	Dec. 31, 2024 $ / shares shares	Jun. 30, 2024 $ / shares shares	Jun. 30, 2024 £ / shares shares
Ordinary Shares
Common share authorized (in shares)		200,000,000	200,000,000
Ordinary shares, par value (in dollars per share) | $ / shares		$ 0.000273235	$ 0.000273235
Common stock, cash dividends declared or paid | $		$ 0
Initial authorized minimum capital requirements | £	£ 50,000
Class A ordinary shares
Ordinary Shares
Ordinary shares, par value (in dollars per share) | $ / shares		$ 0.000273235	0.000273235
Number of votes (per share) | Vote		1
Class A ordinary shares | Kiniksa Bermuda
Ordinary Shares
Shares issued		0		1	1
Shares issued, price per share | £ / shares					£ 0.01
Class A ordinary shares | Kiniksa UK
Ordinary Shares
Shares issued, price per share | $ / shares				$ 0
Class A1 ordinary shares
Ordinary Shares
Ordinary shares, par value (in dollars per share) | $ / shares		$ 0.000273235	0.000273235
Number of votes (per share) | Vote		0
Convertible ratio to Class A ordinary shares		1
Class B ordinary shares
Ordinary Shares
Ordinary shares, par value (in dollars per share) | $ / shares		$ 0.000273235	0.000273235
Number of votes (per share) | Vote		10
Convertible ratio to Class A ordinary shares		1
Convertible ratio to Class B1 ordinary shares		1
Class B1 ordinary shares
Ordinary Shares
Ordinary shares, par value (in dollars per share) | $ / shares		$ 0.000273235	$ 0.000273235
Number of votes (per share) | Vote		0
Convertible ratio to Class A ordinary shares		1
Convertible ratio to Class B ordinary shares		1
Convertible preferred stock | Kiniksa Bermuda
Ordinary Shares
Shares issued				50,000	50,000
Shares issued, price per share | £ / shares					£ 1

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