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Goodwill and Intangible Assets, Net (Tables)
 6 Months Ended
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the Carrying Amount of 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

 
Components of 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.
Estimated Future Amortization Expense Related to Intangible Assets
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