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Goodwill and Intangible Assets, Net
 6 Months Ended
Jun. 30, 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
4

Balance at June 30, 2020
$
48,451

 
Intangible Assets, Net
The components of intangible assets, net were as follows:
 
June 30, 2020
 
December 31, 2019
(In thousands)
Gross (1)
 
Accumulated
Amortization (1)
 
Net
 
Gross (1)
 
Accumulated
Amortization (1)
 
Net
Distribution rights
$
322

 
$
(224
)
 
$
98

 
$
322

 
$
(210
)
 
$
112

Patents
19,250

 
(7,026
)
 
12,224

 
16,587

 
(6,491
)
 
10,096

Trademarks and trade names
2,785

 
(2,358
)
 
427

 
2,785

 
(2,205
)
 
580

Developed and core technology
12,480

 
(11,014
)
 
1,466

 
12,480

 
(10,016
)
 
2,464

Capitalized software development costs
33

 
—

 
33

 
—

 
—

 
—

Customer relationships
32,534

 
(27,595
)
 
4,939

 
32,534

 
(25,956
)
 
6,578

Total intangible assets, net
$
67,404

 
$
(48,217
)
 
$
19,187


$
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 June 30, 2020 and December 31, 2019, respectively.
Amortization expense, which was recognized in selling, general and administrative expenses, was $1.9 million and $1.8 million during the three months ended June 30, 2020 and 2019, respectively. Amortization expense, which was recognized in selling, general and administrative expenses, was $3.7 million and $3.6 million during the six months ended June 30, 2020 and 2019, respectively.
 
Estimated future annual amortization expense related to our intangible assets at June 30, 2020, was as follows:
(In thousands)
 
2020 (remaining 6 months)
$
2,913

2021
3,445

2022
3,334

2023
3,172

2024
2,592

Thereafter
3,731

Total
$
19,187