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Intangible Royalty Assets, Net - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue Benchmark | Individual Licensees Concentration List | Revenue from intangible royalty assets      
Finite-Lived Intangible Assets [Line Items]      
Individual licensees exceeding 10% or more of revenue (as a percent) 86.00% 97.00% 91.00%
DPP-IV patents      
Finite-Lived Intangible Assets [Line Items]      
Finite lived intangible assets, useful life 1 year    
Projected amortization expense, 2022 $ 5.7