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Intangible Royalty Assets, Net - Schedule of Intangible Royalty Interests (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Cost $ 606,216 $ 606,216
Accumulated Amortization 600,546 577,550
Net Carrying Value 5,670 28,666
DPP-IV patents    
Finite-Lived Intangible Assets [Line Items]    
Cost 606,216 606,216
Accumulated Amortization 600,546 577,550
Net Carrying Value $ 5,670 $ 28,666