Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v3.10.0.1
Document and Entity Information - shares
9 Months Ended
Sep. 30, 2018
Nov. 02, 2018
Document and Entity Information [Abstract]    
Entity Registrant Name Adaptimmune Therapeutics PLC  
Entity Central Index Key 0001621227  
Document Type 10-Q  
Document Period End Date Sep. 30, 2018  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   627,422,698
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q3