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Intangible assets - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Dosing Of Specific Number Of Patients | Milestone Payment |  |
Disclosure of detailed information about intangible assets [line items] |  |
Additions | $ 500 |
Successful Completion Of In-Vivo Efficacy Studies | Milestone Payment |  |
Disclosure of detailed information about intangible assets [line items] |  |
Additions | $ 195 |
License To Acquire An Antibody, ZYNLONTA | Milestone Payment |  |
Disclosure of detailed information about intangible assets [line items] |  |
Additions |  | $ 1,050
ZYNLONTA |  |
Disclosure of detailed information about intangible assets [line items] |  |
Useful life measured as period of time, intangible assets other than goodwill |  | 14 years
License To Use Technology To Generate Antibody Drug Conjugates, ZYNLONTA | Milestone Payment |  |
Disclosure of detailed information about intangible assets [line items] |  |
Additions |  | $ 600
License To Use Technology To Generate Antibody Drug Conjugates, ZYNLONTA (2) | License Payment |  |
Disclosure of detailed information about intangible assets [line items] |  |
Additions |  | $ 250

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