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Liability Related to the Sale of Future Royalties - Narrative (Details) $ in Millions | 1 Months Ended
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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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