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Goodwill and Intangible Assets, Net
 6 Months Ended
Jun. 30, 2022
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, 2021
$48,463 
Goodwill acquired during the period (1)
713 
Foreign exchange effects(132)
Balance at June 30, 2022
$49,044 

(1) During the six months ended June 30, 2022, we recognized $0.7 million of goodwill related to the Qterics, Inc. ("Qterics") acquisition. Refer to Note 19 for further information about this acquisition.
Intangible Assets, Net

The components of intangible assets, net were as follows:
 June 30, 2022December 31, 2021
(In thousands)
Gross (1)
Accumulated
Amortization (1)
Net
Gross (1)
Accumulated
Amortization (1)
Net
Capitalized software development costs$1,391 $(52)$1,339 $1,066 $(27)$1,039 
Customer relationships6,340 (2,718)3,622 5,000 (2,375)2,625 
Developed and core technology4,520 (3,511)1,009 4,080 (3,335)745 
Distribution rights300 (261)39 325 (269)56 
Patents26,650 (9,773)16,877 24,518 (9,015)15,503 
Trademarks and trade names850 (656)194 800 (599)201 
Total intangible assets, net$40,051 $(16,971)$23,080 $35,789 $(15,620)$20,169 

(1)This table excludes the gross value of fully amortized intangible assets totaling $43.6 million and $43.2 million at June 30, 2022 and December 31, 2021, respectively.

Amortization expense is recorded in selling, general and administrative expenses, except amortization expense related to capitalized software development costs, which is recorded in cost of sales. Amortization expense by statement of operations caption was as follows:
(In thousands)Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
Cost of sales$12 $4 $24 $8 
Selling, general and administrative expenses989 712 1,910 1,546 
Total amortization expense$1,001 $716 $1,934 $1,554 
 
Estimated future annual amortization expense related to our intangible assets at June 30, 2022, was as follows:
(In thousands)
2022 (remaining 6 months)$2,295 
20234,592 
20243,792 
20253,031 
20262,814 
Thereafter6,556 
Total$23,080