Goodwill and Intangible Assets, Net (Tables)

12 Months Ended

Dec. 31, 2019

Changes in the carrying amount of goodwill were as follows:

The components of intangible assets, net were as follows:



	December 31,
	2019							2018
(In thousands)	Gross ⁽¹⁾		Accumulated Amortization ⁽¹⁾			Net ⁽¹⁾		Gross ⁽¹⁾		Accumulated Amortization ⁽¹⁾			Net ⁽¹⁾
Distribution rights (10 years)	$	322	$	(210	)	$	112	$	329	$	(188	)	$	141
Patents (10 years)	16,587		(6,491		)	10,096		14,560		(5,704		)	8,856
Trademarks and trade names (10 years)	2,785		(2,205		)	580		2,786		(1,900		)	886
Developed and core technology (5-15 years)	12,480		(10,016		)	2,464		12,560		(8,087		)	4,473
Capitalized software development costs (2 years)	—		—			—		155		—			155
Customer relationships (10-15 years)	32,534		(25,956		)	6,578		32,534		(22,675		)	9,859
Total intangible assets, net	$	64,708	$	(44,878	)	$	19,830	$	62,924	$	(38,554	)	$	24,370


⁽¹⁾	This table excludes the gross value of fully amortized intangible assets totaling $7.4 million and $7.1 million on December 31, 2019 and 2018, respectively.

Amortization expense by statement of operations caption was as follows:



	Year Ended December 31,
(In thousands)	2019		2018		2017
Cost of sales	$	—	$	103	$	184
Selling, general and administrative expenses	7,192		7,081		6,772
Total amortization expense	$	7,192	$	7,184	$	6,956

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