v3.26.1
Cover Page - shares
6 Months Ended
Jun. 30, 2026
Aug. 10, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 001-38547  
Entity Registrant Name AUTOLUS THERAPEUTICS PLC  
Entity Incorporation, State or Country Code X0  
Entity Tax Identification Number 00-0000000  
Entity Address, Address Line One The Mediaworks  
Entity Address, Address Line Two 191 Wood Lane  
Entity Address, City or Town London  
Entity Address, Postal Zip Code W12 7FP  
Entity Address, Country GB  
City Area Code (44) 20  
Local Phone Number 3829 6230  
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  
Entity Common Stock, Shares Outstanding   266,162,540
Entity Central Index Key 0001730463  
Amendment Flag false  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
ADR    
Document Information [Line Items]    
Title of 12(b) Security American Depositary Shares, each representing one ordinary share, par value $0.000042 per share  
Trading Symbol AUTL  
Security Exchange Name NASDAQ  
Ordinary Shares    
Document Information [Line Items]    
Title of 12(b) Security Ordinary shares, nominal value $0.000042 per share*  
No Trading Symbol Flag true  
Security Exchange Name NASDAQ