Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2020

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Schedule of Intangible Assets

Intangible assets consist of the following:

	March 31, 2020							December 31, 2019
(In thousands)	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Patents	$	2,916	$	(2,700	)	$	216	$	2,898	$	(2,662	)	$	236
Software	206		(178		)	28		206		(170		)	36
Marketing assets and customer relationships	101		(65		)	36		101		(63		)	38
	$	3,223	$	(2,943	)	$	280	$	3,205	$	(2,895	)	$	310

Schedule of Amortization Expense For Intangible Assets

Amortization expense in the three months ended March 31, 2020 and the three months ended March 31, 2019 was as follows:  

	Three Months Ended March 31,
(In thousands)	2020		2019
Patents	$	38	$	31
Software		8		7
Marketing assets and customer relationships		2		2
	$	48	$	40