v3.25.1
Cover - shares
3 Months Ended
Mar. 31, 2025
Apr. 30, 2025
Entity Listings [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2025  
Document Transition Report false  
Entity File Number 001-39992  
Entity Registrant Name Immunocore Holdings plc  
Entity Incorporation, State or Country Code X0  
Entity Address, Address Line One 92 Park Drive  
Entity Address, Address Line Two Milton Park  
Entity Address, City or Town Abingdon, Oxfordshire,  
Entity Address, Country GB  
Entity Address, Postal Zip Code OX14 4RY  
Country Region +44  
City Area Code 1235  
Local Phone Number 438600  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   50,233,609
Entity Central Index Key 0001671927  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q1  
Amendment Flag false  
American depositary shares    
Entity Listings [Line Items]    
Title of 12(b) Security American Depositary Shares, each representing one ordinary share, nominal value £0.002 per share  
Trading Symbol IMCR  
Security Exchange Name NASDAQ  
Ordinary shares    
Entity Listings [Line Items]    
Title of 12(b) Security Ordinary Share, nominal value £0.002 per share*  
No Trading Symbol Flag true  
Security Exchange Name NASDAQ