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Cover - shares
 9 Months Ended
Sep. 30, 2023
Nov. 09, 2023
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2023  
Document Transition Report false  
Entity File Number 001-38547  
Entity Registrant Name AUTOLUS THERAPEUTICS PLC  
Entity Incorporation, State or Country Code X0  
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  
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  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   173,989,157
Entity Central Index Key 0001730463  
Amendment Flag false  
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --12-31