Basis of Presentation and Significant Accounting Policies - Use of Estimates and Purchase of Rights to Future Milestones and Royalties (Details) - USD ($)
$ in Millions
|9 Months Ended||12 Months Ended|
Sep. 30, 2020
Dec. 31, 2019
|Purchase of Rights to Future Milestones and Royalties|
|Impairment of long-term royalty receivable||$ 0.0||$ 0.0|
The aggregate amount of write-downs for impairments recognized during the period for long term royalty receivable assets.
No definition available.