Intangible Assets, Net and Other non-current assets

12 Months Ended

Dec. 31, 2021

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,
	2021		2020
Purchase technology-based intangible	$	2,358	$	2,358
Purchased patent	509		509
	2,867		2,867
Less: accumulated amortization	(2,816)		(2,765)
Intangible assets, net	51		102
Royalty receivable	6,000		7,000
Other	903		836
Total other non-current assets	$	6,903	$	7,836

Amortization expense was $51 and $51 for each of the years ended December 31, 2021 and 2020, respectively. During the remaining life of the purchased patent, estimated annual amortization expense is $51 for the year ended 2022.