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Intangible Royalty Assets, Net | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Royalty Assets, Net | Intangible Royalty Assets, Net 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, 2021 | Cost |  | Accumulated Amortization |  | Net 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, 2020 | Cost |  | Accumulated Amortization |  | Net Carrying Value
DPP-IV patents | $ | 606,216 |  |  | $ | 577,550 |  |  | $ | 28,666 |
Total intangible royalty assets | $ | 606,216 |  |  | $ | 577,550 |  |  | $ | 28,666 |
The majority of our DPP-IV patents associated with the intangible royalty assets terminate at various dates through 2022. The weighted average remaining life of the intangible royalty assets is less than one year. We project amortization expense will be $5.7 million in 2022. Our revenue is tied to underlying patent protected sales of DPP-IV products of various licensees. Such revenue from royalty assets is earned from sales occurring primarily in the United States and Europe; however, we do not have the ability to disaggregate our royalty revenue from licensees based on the geography of the underlying sales, as this level of information is not always included in royalty reports provided to us. The marketers paying us royalties on these products do not always provide, and are not necessarily required to provide, the breakdown of product sales by geography. Individual licensees exceeding 10% or more of revenue from intangible royalty assets accounted for 86%, 97% and 91% of our revenues from intangible royalty assets in the years ended December 31, 2021, 2020 and 2019, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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