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Subsequent Events
 12 Months Ended
Dec. 31, 2021
Subsequent Events [Abstract]  
Subsequent Events Subsequent EventsIn January 2022, we acquired a royalty interest in aficamten from Cytokinetics, Incorporated (“Cytokinetics”) for $150.0 million, comprised of an upfront payment of $50 million and two additional $50 million payments which are conditional upon the initiation of potential pivotal clinical trials for obstructive hypertrophic cardiomyopathy and nonobstructive hypertrophic cardiomyopathy, respectively. Additionally, we will provide Cytokinetics long-term capital of up to $300 million (“Cytokinetics Commercial Launch Funding”) to support further development of aficamten and potential commercialization of omecamtiv mecarbil. The Cytokinetics Commercial Launch Funding is available in five tranches, including an initial tranche of $50 million funded upon closing and four additional tranches in the aggregate amount of $250 million upon the occurrence of certain regulatory and clinical development milestones.