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Goodwill and Intangible Assets, Net (Tables)
 6 Months Ended
Jun. 30, 2021
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, 2020
$48,614 
Foreign exchange effects(59)
Balance at June 30, 2021
$48,555 
Components of Intangible Assets, Net
The components of intangible assets, net were as follows:
 June 30, 2021December 31, 2020
(In thousands)
Gross (1)
Accumulated
Amortization (1)
Net
Gross (1)
Accumulated
Amortization (1)
Net
Capitalized software development costs$871 $(8)$863 $477 $— $477 
Customer relationships8,100 (4,682)3,418 8,100 (4,329)3,771 
Developed and core technology4,080 (3,189)891 4,080 (3,044)1,036 
Distribution rights342 (268)74 352 (261)91 
Patents22,692 (8,269)14,423 21,601 (7,574)14,027 
Trademarks and trade names800 (546)254 800 (492)308 
Total intangible assets, net$36,885 $(16,962)$19,923 $35,410 $(15,700)$19,710 

(1)This table excludes the gross value of fully amortized intangible assets totaling $43.0 million and $42.7 million at June 30, 2021 and December 31, 2020, respectively.
Finite-lived Intangible Assets Amortization Expense Amortization expense by statement of operations caption was as follows:
(In thousands)Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Cost of sales$4 $— $8 $— 
Selling, general and administrative expenses712 1,906 1,546 3,720 
Total amortization expense$716 $1,906 $1,554 $3,720 
Estimated Future Amortization Expense Related to Intangible Assets
Estimated future annual amortization expense related to our intangible assets at June 30, 2021, was as follows:
(In thousands)
2021 (remaining 6 months)$1,701 
20223,733 
20233,571 
20242,570 
20252,301 
Thereafter6,047 
Total$19,923