Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
6 Months Ended
Jun. 30, 2023
Aug. 07, 2023
Cover [Abstract]    
Document Type 10-Q  
Document Period End Date Jun. 30, 2023  
Document Transition Report false  
Document Quarterly Report true  
Entity File Number 001-37368  
Entity Incorporation, State or Country Code X0  
Entity Address, Address Line One 60 Jubilee Avenue, Milton Park  
Entity Address, City or Town Abingdon, Oxfordshire  
Entity Address, Country GB  
Entity Address, Postal Zip Code OX14 4RX  
City Area Code 44  
Entity Tax Identification Number 00-0000000  
Title of 12(b) Security American Depositary Shares, each representing 6 Ordinary Shares, par value £0.001 per share  
Local Phone Number 1235 430000  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Trading Symbol ADAP  
Entity Common Stock, Shares Outstanding   1,357,031,946
Entity Central Index Key 0001621227  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus Q2  
Amendment Flag false