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Intangible Assets, Net and Other non-current assets | 12 Months Ended
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Dec. 31, 2022
Intangible Assets, Net and Other Assets [Abstract] |
Intangible Assets, Net and Other non-current assets | Intangible Assets, Net and Other non-current assets The following table provides the components of identifiable intangible assets, all of which are finite lived and other non-current assets:
| December 31,
| 2022 |  | 2021
Purchased intangible | $ | 3,858 |  |  | $ | 2,358 |
Purchased patent | 509 |  |  | 509 |
| 4,367 |  |  | 2,867 |
Less: accumulated amortization | (2,932) |  |  | (2,816) |
Intangible assets, net | 1,435 |  |  | 51 |
Royalty receivable | 5,000 |  |  | 6,000 |
Other | 1,451 |  |  | 903 |
Total other non-current assets | $ | 6,451 |  |  | $ | 6,903 |
Amortization expense was $116 and $51 for each of the years ended December 31, 2022 and 2021, respectively. During the remaining life of the purchased intangible, estimated annual amortization expense is $156 for the year ending 2023. Other non-current assets consisted of royalty receivable related to the five $1,000 annual minimum guaranteed royalty that is due in the remaining term of the Monetization Agreement, value-added tax receivable, non-current security deposits, and capitalized cost to obtain revenue contracts. Refer to Note 14, Sale of Future Revenue for detail on the Monetization Agreement royalty receivable.

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