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Goodwill and Intangible Assets, Net
 3 Months Ended
Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets, Net
Goodwill and Intangible Assets, Net
Goodwill
Changes in the carrying amount of goodwill were as follows:
(In thousands)
 
Balance at December 31, 2019
$
48,447

Foreign exchange effects
(31
)
Balance at March 31, 2020
$
48,416

 
Intangible Assets, Net
The components of intangible assets, net were as follows:
 
March 31, 2020
 
December 31, 2019
(In thousands)
Gross (1)
 
Accumulated
Amortization (1)
 
Net
 
Gross (1)
 
Accumulated
Amortization (1)
 
Net
Distribution rights
$
316

 
$
(213
)
 
$
103

 
$
322

 
$
(210
)
 
$
112

Patents
17,625

 
(6,705
)
 
10,920

 
16,587

 
(6,491
)
 
10,096

Trademarks and trade names
2,786

 
(2,282
)
 
504

 
2,785

 
(2,205
)
 
580

Developed and core technology
12,480

 
(10,515
)
 
1,965

 
12,480

 
(10,016
)
 
2,464

Capitalized software development costs
33

 
—

 
33

 
—

 
—

 
—

Customer relationships
32,534

 
(26,775
)
 
5,759

 
32,534

 
(25,956
)
 
6,578

Total intangible assets, net
$
65,774

 
$
(46,490
)
 
$
19,284


$
64,708

 
$
(44,878
)
 
$
19,830

 
(1) 
This table excludes the gross value of fully amortized intangible assets totaling $7.6 million and $7.4 million at March 31, 2020 and December 31, 2019, respectively.
Amortization expense, which was recognized in selling, general and administrative expenses, was $1.8 million and $1.8 million during the three months ended March 31, 2020 and 2019, respectively.
 
Estimated future annual amortization expense related to our intangible assets at March 31, 2020, was as follows:
(In thousands)
 
2020 (remaining 9 months)
$
4,333

2021
2,573

2022
2,575

2023
2,396

2024
1,817

Thereafter
5,590

Total
$
19,284