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Intangible Royalty Assets, Net (Tables)
12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Royalty Interests
The following schedules of the intangible royalty assets present the cost, accumulated amortization and net carrying value as of December 31, 2021 and 2020 (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 
As of December 31, 2020CostAccumulated AmortizationNet Carrying Value
DPP-IV patents$606,216 $577,550 $28,666 
Total intangible royalty assets$606,216 $577,550 $28,666