Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Significant Accounting Policies - Purchase of Rights to Future Milestones and Royalties and Income Taxes and Net Income (Loss) per Share (Details)

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Basis of Presentation and Significant Accounting Policies - Purchase of Rights to Future Milestones and Royalties and Income Taxes and Net Income (Loss) per Share (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Purchase of Rights to Future Milestones and Royalties    
Impairment of long-term royalty receivable $ 0.0 $ 0.0
Income tax penalties or interest charged $ 0.0