Goodwill and Intangible Assets, Net (Tables)

3 Months Ended

Mar. 31, 2019

Changes in the carrying amount of goodwill were as follows:

The components of intangible assets, net were as follows:



	March 31, 2019							December 31, 2018
(In thousands)	Gross ⁽¹⁾		Accumulated Amortization ⁽¹⁾			Net		Gross ⁽¹⁾		Accumulated Amortization ⁽¹⁾			Net
Distribution rights	$	322	$	(189	)	$	133	$	329	$	(188	)	$	141
Patents	14,902		(5,837		)	9,065		14,560		(5,704		)	8,856
Trademarks and trade names	2,786		(1,976		)	810		2,786		(1,900		)	886
Developed and core technology	12,560		(8,591		)	3,969		12,560		(8,087		)	4,473
Capitalized software development costs	222		—			222		155		—			155
Customer relationships	32,683		(23,645		)	9,038		32,534		(22,675		)	9,859
Total intangible assets, net	$	63,475	$	(40,238	)	$	23,237	$	62,924	$	(38,554	)	$	24,370


⁽¹⁾	This table excludes the gross value of fully amortized intangible assets totaling $7.1 million and $7.1 million at March 31, 2019 and December 31, 2018, respectively.

Amortization expense by statement of operations caption was as follows:



	Three Months Ended March 31,
(In thousands)	2019		2018
Cost of sales	$	—	$	55
Selling, general and administrative expenses	1,784		1,747
Total amortization expense	$	1,784	$	1,802

Estimated future annual amortization expense related to our intangible assets at March 31, 2019, was as follows: