Goodwill and Intangible Assets, Net (Tables)

3 Months Ended

Mar. 31, 2018

Changes in the carrying amount of goodwill were as follows:

The components of intangible assets, net were as follows:



	March 31, 2018							December 31, 2017
(In thousands)	Gross ⁽¹⁾		Accumulated Amortization ⁽¹⁾			Net		Gross ⁽¹⁾		Accumulated Amortization ⁽¹⁾			Net
Distribution rights	$	353	$	(177	)	$	176	$	344	$	(165	)	$	179
Patents	13,258		(5,088		)	8,170		13,250		(5,310		)	7,940
Trademarks and trade names	2,776		(1,663		)	1,113		2,786		(1,594		)	1,192
Developed and core technology	12,544		(6,565		)	5,979		12,560		(6,071		)	6,489
Capitalized software development costs	142		(95		)	47		142		(77		)	65
Customer relationships	32,425		(20,134		)	12,291		32,534		(19,395		)	13,139
Order backlog	150		(150		)	—		150		(113		)	37
Total intangible assets, net	$	61,648	$	(33,872	)	$	27,776	$	61,766	$	(32,725	)	$	29,041


⁽¹⁾	This table excludes the gross value of fully amortized intangible assets totaling $6.5 million and $6.0 million at March 31, 2018 and December 31, 2017, respectively.

Amortization expense by income statement caption was as follows:



	Three Months Ended March 31,
(In thousands)	2018		2017
Cost of sales	$	55	$	19
Selling, general and administrative expenses	1,747		1,581
Total amortization expense	$	1,802	$	1,600

Estimated future annual amortization expense related to our intangible assets at March 31, 2018, is as follows: