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Intangible Royalty Assets, Net
 6 Months Ended
Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Royalty Assets, Net Intangible Royalty Assets, Net
The following tables summarize the cost, accumulated amortization and net carrying value of our intangible royalty assets as of June 30, 2022 and December 31, 2021 (in thousands):
As of June 30, 2022CostAccumulated AmortizationNet Carrying Value
DPP-IV patents$606,216 $606,216 $— 
Total intangible royalty assets$606,216 $606,216 $— 
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 June 30, 2022, the intangible royalty assets were fully amortized as our royalties on Januvia and Janumet expired in the three months ended March 31, 2022. Our royalties on the other DPP-IV products have also substantially ended.
Revenue from intangible assets is tied to underlying patent protected sales of DPP-IV products of various licensees. Such revenue is earned from sales occurring primarily in the United States and Europe; however, we do not have the ability to disaggregate such revenue from licensees based on the geography of the underlying sales as this information may not be provided to us by marketers. For the three months ended June 30, 2022, revenue from intangible royalty assets was not material. Individual licensees exceeding 10% or more of revenue from intangible royalty assets accounted for 90% of revenues from intangible royalty assets in the three months ended June 30, 2021. Individual licensees exceeding 10% or more of revenue from intangible royalty assets accounted for 93% and 94% of revenues from intangible royalty assets in the six months ended June 30, 2022 and 2021, respectively.