Intangible Assets

12 Months Ended

Dec. 31, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible Assets

4. Intangible Assets

Intangible Assets consists of the following (in thousands):

	As of December 31,
	2021			2020
Patents	$	1,277		$	2,286
Less: accumulated amortization		(403	)		(1,099	)
		874			1,187
Indefinite life logos and trademarks		75			75
Intangible assets, net	$	949		$	1,262

Amortization expense for the years ended December 31, 2021 and 2020 was $91 thousand. During the years ended December 31, 2021 and 2020, the Company fully impaired and abandoned certain patents that the Company concluded it would no

longer defend or incur additional costs to maintain. Impairment charges for the years ended December 31, 2021 and 2020 was $250 thousand and $65 thousand, respectively. The impairment charges, measured on a cost basis, related to abandonment of certain internally generated and licensed intellectual property in the Company’s therapeutic market segment that was determined by management to have no future economic benefit.

The timing of approval of pending patent applications is uncertain and, therefore, are included in the thereafter period below until issued. Pending patents as of December 31, 2021 was $108 thousand. As of December 31, 2021, future amortization expense related to intangible assets subject to amortization is expected to be as follows (in thousands):

Years ending December 31,
2022		78
2023		78
2024		78
2025		75
2026		72
Thereafter		493
Total	$	874