Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2019

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Schedule of Intangible Assets

Intangible assets consist of the following:

	March 31, 2019							December 31, 2018
(In thousands)	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Patents	$	2,785	$	(2,564	)	$	221	$	2,754	$	(2,533	)	$	221
Software	206		(148		)	58		206		(141		)	65
Marketing assets and customer relationships	101		(56		)	45		101		(54		)	47
Non-compete agreements	101		(101		)	—		101		(101		)	—
	$	3,193	$	(2,869	)	$	324	$	3,162	$	(2,829	)	$	333

Schedule of Amortization Expense For Intangible Assets

Amortization expense for our intangible assets in the three months ended March 31, 2019 and the three months ended March 31, 2018 was as follows:

	Three Months Ended March 31,
(In thousands)	2019		2018
Patents	$	31	$	28
Software		7		8
Marketing assets and customer relationships		2		4
Non-compete agreements		—		5
	$	40	$	45