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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, 2023
Sep. 30, 2022
Disclosure of joint ventures [line items]    
Beginning balance $ 31,152  
Ending balance 26,989  
Overland ADCT BioPharma    
Disclosure of joint ventures [line items]    
Beginning balance 31,152 $ 41,236
Share of comprehensive loss in joint venture (4,163) (6,549)
Ending balance $ 26,989 $ 34,687