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Liability Related to the Sale of Future Royalties - Narrative (Details) $ in Millions	1 Months Ended
	Mar. 31, 2019 USD ($)
Nonmonetary Transaction [Line Items]
Transaction fees	$ 0.6
Oberland Capital
Nonmonetary Transaction [Line Items]
Transaction expenses	$ 65.0
Purchaser default option period	180 days
Percentage of royalty purchase agreement	250.00%
Non-cash interest rate	6.10%

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