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Interest in joint venture - Schedule of movement in interest in joint venture (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Disclosure of joint ventures [line items]    
Beginning balance $ 41,236  
Ending balance 34,687  
Overland ADCT BioPharma    
Disclosure of joint ventures [line items]    
Beginning balance 41,236 $ 47,908
Share of results in joint venture (6,549) (3,906)
Ending balance $ 34,687 $ 44,002