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Related parties - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Disclosure of transactions between related parties [line items]          
Amounts payable, related party transactions         $ 20
Overland ADCT BioPharma          
Disclosure of transactions between related parties [line items]          
Services provided to, related party transactions $ 642 $ 818 $ 2,952 $ 2,014  
Amounts receivable, related party transactions $ 2,123   $ 2,123   $ 805