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Intangible Royalty Assets, Net - Schedule of Intangible Royalty Interests (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]    
Cost   $ 606,216
Accumulated Amortization   600,546
Net Carrying Value $ 0 5,670
DPP-IV patents    
Finite-Lived Intangible Assets [Line Items]    
Cost   606,216
Accumulated Amortization   600,546
Net Carrying Value   $ 5,670