Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2020

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Schedule of Intangible Assets

Intangible assets consisted of the following:

	June 30, 2020							December 31, 2019
(In thousands)	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Patents	$	2,939	$	(2,735	)	$	204	$	2,898	$	(2,662	)	$	236
Software	206		(185		)	21		206		(170		)	36
Marketing assets and customer relationships	101		(68		)	33		101		(63		)	38
	$	3,246	$	(2,988	)	$	258	$	3,205	$	(2,895	)	$	310

Schedule of Amortization Expense For Intangible Assets

Amortization expense in the three and six months ended June 30, 2020 and June 30, 2019 was as follows:  

	Three Months Ended June 30,				Six Months Ended June 30,
(In thousands)	2020		2019		2020		2019
Patents	$	35	$	33	$	73	$	64
Software		7		8		15		15
Marketing assets and customer relationships		3		2		5		4
	$	45	$	43	$	93	$	83