Intangible Assets

9 Months Ended

Sep. 30, 2018

Intangible Assets, Net (Excluding Goodwill) [Abstract]

8. INTANGIBLE ASSETS:

Intangible assets consist of the following:


	September 30, 2018							December 31, 2017
(In thousands)	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Patents	$	2,727	$	(2,515	)	$	212	$	2,687	$	(2,463	)	$	224
Software	206		(134		)	72		206		(111		)	95
Marketing assets and customer relationships	101		(52		)	49		101		(45		)	56
Non-compete agreements	101		(101		)	—		101		(96		)	5
	$	3,135	$	(2,802	)	$	333	$	3,095	$	(2,715	)	$	380

Amortization expense for our intangible assets in the three and nine months ended September 30, 2018 and 2017 was as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
(In thousands)	2018		2017		2018		2017
Patents	$	28	$	31	$	84	$	82
Software		8		6		23		22
Marketing assets and customer relationships		2		3		7		9
Non-compete agreements		—		5		5		18
	$	38	$	45	$	119	$	131

Amortization of patents has been classified as research and development expense in our statements of operations. Estimated aggregate amortization expense based on current intangible assets for the next five years is expected to be as follows: $38,000 for the remainder of 2018; $137,000 in 2019; $106,000 in 2020; $32,000 in 2021; $9,000 in 2022; and $9,000 in 2023.

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.