v3.26.1
Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2025
Mar. 30, 2026
Jun. 30, 2025
Document And Entity Information [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2025    
Securities Act File Number 001-38520    
Entity Registrant Name MEIRAGTX HOLDINGS PLC    
Entity Incorporation, State or Country Code E9    
Entity Tax Identification Number 98-1448305    
Entity Address, Address Line One 655 Third Avenue, Suite 1115    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10017    
City Area Code 646    
Local Phone Number 860-7985    
Title of 12(b) Security Ordinary Shares, $0.00003881 par value per share    
Trading Symbol MGTX    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Interactive Data Current Yes    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Current Reporting Status Yes    
Entity Shell Company false    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Public Float     $ 524,509,772
Entity Common Stock, Shares Outstanding   81,446,126  
Documents Incorporated by Reference

Portions of the registrant’s definitive Proxy Statement relating to its 2026 annual shareholder meeting to be filed with the SEC within 120 days after the end of the fiscal year ended December 31, 2025 are incorporated herein by reference in Part III of this Annual Report on Form 10-K.

    
Auditor Name Ernst & Young LLP    
Auditor Firm ID 42    
Auditor Location Jericho, New York    
Entity Central Index Key 0001735438    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false