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Intangible assets and goodwill - Future Amortization (Details) - Intellectual Property
$ in Thousands
Dec. 31, 2020
USD ($)
Finite-Lived Intangible Assets  
2021 $ 42,341
2022 42,341
2023 42,341
2023 7,064
2024 and thereafter 4,741
Total $ 138,828