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Goodwill and Intangible Assets, Net (Tables)
 3 Months Ended
Mar. 31, 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
(31
)
Balance at March 31, 2020
$
48,416

 
Components of 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.
Estimated Future Amortization Expense Related to Intangible Assets
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