Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Jul. 31, 2019
Document and Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Entity Interactive Data Current Yes  
Trading Symbol MGTX  
Entity Registrant Name MeiraGTx Holdings plc  
Entity Central Index Key 0001735438  
Current Fiscal Year End Date --12-31  
Entity Shell Company false  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   33,369,314
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Current Reporting Status Yes  
Entity Address, State or Province NY  
Title of 12(b) Security Ordinary Shares  
Security Exchange Name NASDAQ