Goodwill and Intangible Assets, Net (Tables)

6 Months Ended

Jun. 30, 2018

Changes in the carrying amount of goodwill were as follows:

The components of intangible assets, net were as follows:



	June 30, 2018							December 31, 2017
(In thousands)	Gross ⁽¹⁾		Accumulated Amortization ⁽¹⁾			Net		Gross ⁽¹⁾		Accumulated Amortization ⁽¹⁾			Net
Distribution rights	$	335	$	(176	)	$	159	$	344	$	(165	)	$	179
Patents	13,662		(5,218		)	8,444		13,250		(5,310		)	7,940
Trademarks and trade names	2,786		(1,746		)	1,040		2,786		(1,594		)	1,192
Developed and core technology	12,560		(7,079		)	5,481		12,560		(6,071		)	6,489
Capitalized software development costs	198		(113		)	85		142		(77		)	65
Customer relationships	32,534		(21,035		)	11,499		32,534		(19,395		)	13,139
Order backlog	—		—			—		150		(113		)	37
Total intangible assets, net	$	62,075	$	(35,367	)	$	26,708	$	61,766	$	(32,725	)	$	29,041


⁽¹⁾	This table excludes the gross value of fully amortized intangible assets totaling $6.8 million and $6.0 million at June 30, 2018 and December 31, 2017, respectively.

Amortization expense by income statement caption was as follows:



	Three Months Ended June 30,				Six Months Ended June 30,
(In thousands)	2018		2017		2018		2017
Cost of sales	$	18	$	55	$	73	$	74
Selling, general and administrative expenses	1,758		1,736		3,505		3,317
Total amortization expense	$	1,776	$	1,791	$	3,578	$	3,391

Estimated future annual amortization expense related to our intangible assets at June 30, 2018, was as follows: