Basis of Presentation and Significant Accounting Policies - Purchase of Rights to Future Milestones and Royalties (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Purchase of Rights to Future Milestones and Royalties | ||
| Impairment of long-term royalty receivable | $ 0.0 | $ 0.0 |
| X | ||||||||||
- Definition The aggregate amount of write-downs for impairments recognized during the period for long term royalty receivable assets. No definition available.
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| X | ||||||||||
- References No definition available.
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