Intangible Assets

6 Months Ended

Jun. 30, 2019

Intangible Assets Net Excluding Goodwill [Abstract]

10. INTANGIBLE ASSETS

Intangible assets include intangibles acquired in conjunction with several acquisitions since 2011, with the most recent being SmartRG, Inc. in November 2018.

The following table presents our intangible assets as of June 30, 2019 and December 31, 2018:

	June 30, 2019							December 31, 2018
(In thousands)	Gross Value		Accumulated Amortization			Net Value		Gross Value		Accumulated Amortization			Net Value
Customer relationships	$	22,414	$	(6,311	)	$	16,103	$	22,455	$	(5,380	)	$	17,075
Developed technology		10,170		(2,810	)		7,360		12,801		(4,867	)		7,934
Licensed technology		5,900		(847	)		5,053		5,900		(520	)		5,380
Supplier relationships		2,800		(1,808	)		992		2,800		(1,108	)		1,692
Licensing agreements		560		(43	)		517		560		(5	)		555
Patents		500		(191	)		309		500		(157	)		343
Trade names		310		(141	)		169		310		(106	)		204
Total	$	42,654	$	(12,151	)	$	30,503	$	45,326	$	(12,143	)	$	33,183

Amortization expense was $1.3 million and $1.0 million for the three months ended June 30, 2019 and 2018 respectively, and $2.7 million and $1.5 million for the six months ended June 30, 2019 and 2018.

As of June 30, 2019, the estimated future amortization expense of our intangible assets was as follows:

(In thousands)	Amount
Remainder of 2019	$	2,665
2020		4,448
2021		4,099
2022		3,475
2023		3,322
Thereafter		12,494
Total	$	30,503