Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2019

Intangible Assets

Schedule of finite lived intangible assets

	Weighted-	At September 30, 2019						At December 31, 2018
	Average	Gross						Gross
	Amortization	Carrying		Accumulated		Net		Carrying		Accumulated		Net
(In thousands)	Period	Amount		Amortization		Amount		Amount		Amortization		Amount
Patents	11 years	$	4,406	$	328	$	4,078	$	4,253	$	71	$	4,182
Defensive intangible assets	5 years		1,126		224		902		1,126		82		1,044
Customer accounts	4 years		125		31		94		125		12		113
Total		$	5,657	$	583	$	5,074	$	5,504	$	165	$	5,339

Schedule of future amortization expense

(In thousands)
2019 (October 1 - December 31)	$	140
2020		558
2021		558
2022		558
2023		490
Thereafter		2,770
Total	$	5,074