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Goodwill and Intangible Assets, Net (Tables)
 12 Months Ended
Dec. 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, 2018$48,485 
Foreign exchange effects(38)
Balance at December 31, 201948,447 
Foreign exchange effects167 
Balance at December 31, 2020$48,614 
Components of Intangible Assets
The components of intangible assets, net were as follows: 
December 31,
 20202019
(In thousands)
Gross (1)
Accumulated
Amortization (1)
Net (1)
Gross (1)
Accumulated
Amortization (1)
Net (1)
Capitalized software development costs (2 years)
$477 $— $477 $— $— $— 
Customer relationships
(10-15 years)
8,100 (4,329)3,771 32,534 (25,956)6,578 
Developed and core technology
(5-15 years)
4,080 (3,044)1,036 12,480 (10,016)2,464 
Distribution rights (10 years)
352 (261)91 322 (210)112 
Patents (10 years)
21,601 (7,574)14,027 16,587 (6,491)10,096 
Trademarks and trade names
(10 years)
800 (492)308 2,785 (2,205)580 
Total intangible assets, net$35,410 $(15,700)$19,710 $64,708 $(44,878)$19,830 
(1)This table excludes the gross value of fully amortized intangible assets totaling $42.7 million and $7.4 million on December 31, 2020 and 2019, respectively.
Amortization Expense by Income Statement Caption Amortization expense by statement of operations caption was as follows:
 Year Ended December 31,
(In thousands)202020192018
Cost of sales$— $— $103 
Selling, general and administrative expenses6,500 7,192 7,081 
Total amortization expense$6,500 $7,192 $7,184 
Estimated Future Amortization Expense Related to Intangible Assets
Estimated future annual amortization expense related to our intangible assets at December 31, 2020, is as follows: 
(In thousands) 
2021$3,259 
20223,386 
20233,240 
20242,419 
20252,150 
Thereafter5,256 
Total$19,710