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Intangible Assets, Net and Other non-current assets
 12 Months Ended
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,
 20222021
Purchased intangible$3,858 $2,358 
Purchased patent509 509 
4,367 2,867 
Less: accumulated amortization(2,932)(2,816)
Intangible assets, net1,435 51 
Royalty receivable5,000 6,000 
Other1,451 903 
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.