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Research & Development ("R&D") Funding Expense	12 Months Ended
	Dec. 31, 2021
Research and Development [Abstract]
Research & Development ("R&D") Funding Expense	Research & Development (“R&D”) Funding Expense R&D funding expense consists of upfront and ongoing R&D payments we have made to counterparties to acquire royalties and/or milestones on development-stage product candidates. Ongoing R&D payments are made as the related development-stage product candidates undergo clinical trials with our counterparties. During the year ended December 31, 2021, 2020, and 2019 we did not enter into any new ongoing R&D funding arrangements. We recognized R&D funding expense of $200.1 million during the year ended December 31, 2021, comprised of $6.9 million in ongoing R&D expenses, primarily under our co-funding agreement with Sanofi, and $193.2 million in upfront R&D funding. As part of a long-term strategic funding partnership with MorphoSys, which closed on July 15, 2021 (as further discussed in Note 17–Commitments and Contingencies), we allocated $90.0 million of the upfront payment to R&D funding expense, representing two development-stage products acquired in exchange for future royalties. Additionally, we made an upfront payment of $103.2 million to BioCryst to acquire a royalty on a development-stage product in November 2021. We recognized R&D funding expense of $26.3 million during the year ended December 31, 2020, of which $20.5 million related to ongoing development-stage funding payments, primarily under our co-funding agreement with Sanofi and $5.8 million related to upfront funding for a royalty on a development-stage product that we acquired from BioCryst. We recognized $83.0 million of R&D funding expense during the year ended December 31, 2019, of which $18.2 million and $62.8 million related to our funding agreements with both Sanofi and Pfizer, respectively. We completed our funding commitments in the fourth quarter of 2019 under our agreement with Pfizer. We did not have upfront development-stage R&D funding expense in 2019. As of December 31, 2021, we have a remaining commitment of $10.7 million related to our R&D funding agreement with Sanofi.

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- Definition

The entire disclosure for research, development, and computer software activities, including contracts and arrangements to be performed for others and with federal government. Includes costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility and in-process research and development acquired in a business combination consummated during the period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 730
-URI http://asc.fasb.org/subtopic&trid=2197926

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