Goodwill and Intangible Assets, Net (Tables)

6 Months Ended

Jun. 30, 2019

Changes in the carrying amount of goodwill were as follows:

The components of intangible assets, net were as follows:



	June 30, 2019							December 31, 2018
(In thousands)	Gross ⁽¹⁾		Accumulated Amortization ⁽¹⁾			Net		Gross ⁽¹⁾		Accumulated Amortization ⁽¹⁾			Net
Distribution rights	$	326	$	(199	)	$	127	$	329	$	(188	)	$	141
Patents	15,254		(6,041		)	9,213		14,560		(5,704		)	8,856
Trademarks and trade names	2,786		(2,053		)	733		2,786		(1,900		)	886
Developed and core technology	12,560		(9,095		)	3,465		12,560		(8,087		)	4,473
Capitalized software development costs	288		—			288		155		—			155
Customer relationships	32,684		(24,464		)	8,220		32,534		(22,675		)	9,859
Total intangible assets, net	$	63,898	$	(41,852	)	$	22,046	$	62,924	$	(38,554	)	$	24,370


⁽¹⁾	This table excludes the gross value of fully amortized intangible assets totaling $7.2 million and $7.1 million at June 30, 2019 and December 31, 2018, respectively.

Amortization expense by statement of operations caption was as follows:



	Three Months Ended June 30,				Six Months Ended June 30,
(In thousands)	2019		2018		2019		2018
Cost of sales	$	—	$	18	$	—	$	73
Selling, general and administrative expenses	1,800		1,758		3,584		3,505
Total amortization expense	$	1,800	$	1,776	$	3,584	$	3,578

Estimated future annual amortization expense related to our intangible assets at June 30, 2019, was as follows: