XML 20 R1.htm IDEA: XBRL DOCUMENT v3.25.4
Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Mar. 06, 2026
Jun. 30, 2025
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-40367    
Entity Registrant Name BARINTHUS BIOTHERAPEUTICS PLC    
Entity Incorporation, State or Country Code X0    
Entity Address, Address Line One 20400 Century Blvd    
Entity Address, Address Line Two Suite 210    
Entity Address, City or Town Germantown    
Entity Address, State or Province MD    
Entity Address, Postal Zip Code 20874    
City Area Code 443    
Local Phone Number 917-0966    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 13.7
Entity Common Stock, Shares Outstanding   40,848,893  
Entity Central Index Key 0001828185    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Tax Identification Number 00-0000000    
American Depositary Shares      
Document Information [Line Items]      
Title of 12(b) Security American Depositary Shares    
Trading Symbol BRNS    
Security Exchange Name NASDAQ    
Ordinary shares      
Document Information [Line Items]      
Title of 12(b) Security Ordinary shares, nominal value £0.000025 per share