Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2018

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Schedule of 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

Schedule of Amortization Expense For Intangible Assets

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