Goodwill and Intangible Assets, Net (Tables)

9 Months Ended

Sep. 30, 2018

Changes in the carrying amount of goodwill were as follows:

The components of intangible assets, net were as follows:



	September 30, 2018							December 31, 2017
(In thousands)	Gross ⁽¹⁾		Accumulated Amortization ⁽¹⁾			Net		Gross ⁽¹⁾		Accumulated Amortization ⁽¹⁾			Net
Distribution rights	$	333	$	(182	)	$	151	$	344	$	(165	)	$	179
Patents	14,194		(5,502		)	8,692		13,250		(5,310		)	7,940
Trademarks and trade names	2,786		(1,823		)	963		2,786		(1,594		)	1,192
Developed and core technology	12,560		(7,583		)	4,977		12,560		(6,071		)	6,489
Capitalized software development costs	249		(131		)	118		142		(77		)	65
Customer relationships	32,534		(21,855		)	10,679		32,534		(19,395		)	13,139
Order backlog	—		—			—		150		(113		)	37
Total intangible assets, net	$	62,656	$	(37,076	)	$	25,580	$	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 September 30, 2018 and December 31, 2017, respectively.

Amortization expense by income statement caption was as follows:



	Three Months Ended September 30,				Nine Months Ended September 30,
(In thousands)	2018		2017		2018		2017
Cost of sales	$	18	$	54	$	91	$	128
Selling, general and administrative expenses	1,770		1,715		5,275		5,032
Total amortization expense	$	1,788	$	1,769	$	5,366	$	5,160

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