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Intangible assets and goodwill - Future Amortization (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Total		$ 124,531
Marathon Pharmaceuticals, LLC | Intellectual Property
Finite-Lived Intangible Assets [Line Items]
2019	$ 24,283
2020	24,276
2021	24,277
2022	24,277
2023 and thereafter	$ 27,418

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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