Intangible Assets

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

7.INTANGIBLE ASSETS

Patent costs, which are included in Other assets in the accompanying Consolidated Balance Sheets, as of December 31 were as follows (in thousands):

	2023			2022
Patent costs	$	900		$	1,030
Accumulated amortization		(708	)		(772	)
	$	192		$	258

Definite lived intangible assets, such as patent rights, are amortized and tested for impairment if a triggering event occurs.

As of December 31, 2023 and 2022, we had $11,712,000 and $3,202,000, respectively, of capitalized internal-use software costs which have not been amortized as the software has not yet been placed in service.

Amortization expense was approximately $66,000, $75,000 and $96,000 in 2023, 2022, and 2021, respectively.