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Intangible assets and goodwill - Future Amortization (Details) - Marathon Pharmaceuticals, LLC - Intellectual Property $ in Thousands	Dec. 31, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items]
2020	$ 31,139
2021	31,139
2022	31,139
2023	31,139
2024 and thereafter	9,444
Total	$ 134,000

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