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Intangible Assets

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

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):


	2020			2019
Patent costs	$	1,859		$	1,992
Accumulated amortization		(1,434	)		(1,483	)

	$	425		$	509

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

Amortization expense was approximately $106,000, $108,000 and $119,000 in 2020, 2019 and 2018, respectively. The estimated future amortization expense from patent assets held as of December 31, 2020, is projected to be $96,000, $64,000, $54,000, $46,000 and $33,000, in fiscal years 2021, 2022, 2023, 2024, and 2025, respectively.