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Interest in joint venture - Narrative (Details)
$ in Millions
9 Months Ended
Dec. 14, 2020
product
Sep. 30, 2023
USD ($)
Disclosure of joint ventures [line items]    
Deferred Gain On Investment In Joint Venture | $   $ 23.5
Overland ADCT BioPharma    
Disclosure of joint ventures [line items]    
Number of product candidates developed and commercialized in joint venture 3  
Number of products developed and commercialized in joint venture 1