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Intangible Royalty Assets, Net (Tables)
12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Royalty Interests
As of December 31, 2021, the cost, accumulated amortization and net carrying value of our intangible royalty assets are summarized as below (in thousands):
As of December 31, 2021CostAccumulated AmortizationNet Carrying Value
DPP-IV patents$606,216 $600,546 $5,670 
Total intangible royalty assets$606,216 $600,546 $5,670