Intangible Assets

9 Months Ended

Sep. 30, 2019

Intangible Assets, Net (Excluding Goodwill) [Abstract]

9. INTANGIBLE ASSETS:

Intangible assets consist of the following:


	September 30, 2019							December 31, 2018
(In thousands)	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Patents	$	2,842	$	(2,630	)	$	212	$	2,754	$	(2,533	)	$	221
Software	206		(163		)	43		206		(141		)	65
Marketing assets and customer relationships	101		(61		)	40		101		(54		)	47
Non-compete agreements	101		(101		)	—		101		(101		)	—
	$	3,250	$	(2,955	)	$	295	$	3,162	$	(2,829	)	$	333

Amortization expense for our intangible assets in the three and nine months ended September 30, 2019 and the three and nine months ended September 30, 2018 was as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
(In thousands)	2019		2018		2019		2018
Patents	$	33	$	28	$	97	$	84
Software		7		8		22		23
Marketing assets and customer relationships		3		2		7		7
Non-compete agreements		—		—		—		5
	$	43	$	38	$	126	$	119

Amortization of patents has been classified as research and development expense in the accompanying consolidated statements of operations. Estimated aggregate future amortization expense based on current intangible assets is expected to be as follows: $42,000 for the remainder of 2019; $149,000 in 2020; $74,000 in 2021; $19,000 in 2022; $9,000 in 2023; and $2,000 in 2024.

Intangible and other long-lived assets are reviewed for impairment when events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. An impairment loss is recognized when future undiscounted cash flows expected to result from use of the asset and its eventual disposition are less than the carrying amount. There were no impairments in the nine months ended September 30, 2019 or the nine months ended September 30, 2018.