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Inventories - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2021
Sep. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Disclosure Of Detailed Information About Expenses By Nature [Line Items]        
Gain from reversal of inventory impairment charges $ 7,049   $ 0 $ (7,049)
ZYNLONTA For R&D        
Disclosure Of Detailed Information About Expenses By Nature [Line Items]        
Gain from reversal of inventory impairment charges   $ 75 $ 75