Quarterly report pursuant to Section 13 or 15(d)

Cover

v3.20.1
Cover - shares
 3 Months Ended
Mar. 31, 2020
May 13, 2020
Cover [Abstract]    
Document Type 10-Q/A  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Mar. 31, 2020  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2020  
Current Fiscal Year End Date --12-31  
Entity File Number 001-37368  
Entity Registrant Name ADAPTIMMUNE THERAPEUTICS PLC  
Entity Central Index Key 0001621227  
Entity Tax Identification Number 00-0000000  
Entity Incorporation, State or Country Code X0  
Entity Address, Address Line One 60 Jubilee Avenue  
Entity Address, Address Line Two Milton Park  
Entity Address, City or Town Abingdon, Oxfordshire  
Entity Address, Country GB  
Entity Address, Postal Zip Code OX14 4RX  
City Area Code 44  
Local Phone Number 1235 430000  
Title of 12(b) Security American Depositary Shares, each representing 6 Ordinary Shares, par value £0.001 per share  
Trading Symbol ADAP  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   780,593,444