v3.25.2
Cover - shares
6 Months Ended
Jun. 30, 2025
Aug. 01, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-39071  
Entity Registrant Name ADC Therapeutics SA  
Entity Incorporation, State or Country Code V8  
Entity Address, Address Line One Biopôle  
Entity Address, Address Line Two Route de la Corniche 3B  
Entity Address, Postal Zip Code 1066  
Entity Address, City or Town Epalinges  
Entity Address, Country CH  
Country Region 41  
City Area Code 21 653  
Local Phone Number 02 00  
Title of 12(g) Security Common Shares, par value CHF 0.08 per share  
Trading Symbol ADCT  
Security Exchange Name NYSE  
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   112,499,395
Amendment flag false  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Entity central index key 0001771910  
Current Fiscal Year End Date --12-31