v3.24.3
Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2024
Oct. 25, 2024
Document information    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Sep. 30, 2024  
Securities Act File Number 001-38492  
Entity Registrant Name Kiniksa Pharmaceuticals International, plc  
Entity Incorporation, State or Country Code X0  
Entity Tax Identification Number 00-0000000  
Entity Address, Address Line One 23 Old Bond Street, Floor 3  
Entity Address, City or Town London  
Entity Address, Country GB  
Entity Address, Postal Zip Code WIS 4PZ  
City Area Code (781)  
Local Phone Number 431-9100  
Title of 12(b) Security Class A Ordinary Shares  
Trading Symbol KNSA  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Information, Former Legal or Registered Name Kiniksa Pharmaceuticals, Ltd.  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0001730430  
Amendment Flag false  
Former address    
Document information    
Entity Address, Address Line One Clarendon House  
Entity Address, Address Line Two 2 Church Street  
Entity Address, City or Town Hamilton  
Entity Address, Country BM  
Entity Address, Postal Zip Code HM11  
Ordinary shares    
Document information    
Entity Common Stock, Shares Outstanding   72,201,565
Class A ordinary shares    
Document information    
Entity Common Stock, Shares Outstanding   41,566,825
Class B ordinary shares    
Document information    
Entity Common Stock, Shares Outstanding   1,795,158
Class A1 ordinary shares    
Document information    
Entity Common Stock, Shares Outstanding   12,781,964
Class B1 ordinary shares    
Document information    
Entity Common Stock, Shares Outstanding   16,057,618