Goodwill and Intangible Assets, Net (Tables)

9 Months Ended

Sep. 30, 2019

Changes in the carrying amount of goodwill were as follows:

The components of intangible assets, net were as follows:



	September 30, 2019							December 31, 2018
(In thousands)	Gross ⁽¹⁾		Accumulated Amortization ⁽¹⁾			Net		Gross ⁽¹⁾		Accumulated Amortization ⁽¹⁾			Net
Distribution rights	$	314	$	(198	)	$	116	$	329	$	(188	)	$	141
Patents	15,606		(6,253		)	9,353		14,560		(5,704		)	8,856
Trademarks and trade names	2,786		(2,129		)	657		2,786		(1,900		)	886
Developed and core technology	12,560		(9,597		)	2,963		12,560		(8,087		)	4,473
Capitalized software development costs	—		—			—		155		—			155
Customer relationships	32,683		(25,285		)	7,398		32,534		(22,675		)	9,859
Total intangible assets, net	$	63,949	$	(43,462	)	$	20,487	$	62,924	$	(38,554	)	$	24,370


⁽¹⁾	This table excludes the gross value of fully amortized intangible assets totaling $7.3 million and $7.1 million at September 30, 2019 and December 31, 2018, respectively.

Amortization expense by statement of operations caption was as follows:



	Three Months Ended September 30,				Nine Months Ended September 30,
(In thousands)	2019		2018		2019		2018
Cost of sales	$	—	$	18	$	—	$	91
Selling, general and administrative expenses	1,798		1,770		5,382		5,275
Total amortization expense	$	1,798	$	1,788	$	5,382	$	5,366

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