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Goodwill and Intangible Assets, Net
 12 Months Ended
Dec. 31, 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, 2020$48,614 
Foreign exchange effects(151)
Balance at December 31, 202148,463 
Goodwill acquired during the period (1)
713 
Foreign exchange effects(91)
Balance at December 31, 2022$49,085 
(1) During the year ended December 31, 2022, we recognized $0.7 million of goodwill related to the Qterics, Inc. ("Qterics") acquisition. Refer to Note 21 for further information about this acquisition.
We conducted annual goodwill impairment reviews on December 31, 2022, 2021 and 2020. Based on the analysis performed, we determined that our goodwill was not impaired.

Intangible Assets, Net

The components of intangible assets, net were as follows: 
December 31,
 20222021
(In thousands)
Gross (1)
Accumulated
Amortization (1)
Net (1)
Gross (1)
Accumulated
Amortization (1)
Net (1)
Capitalized software development costs (2 years)
$1,647 $(44)$1,603 $1,066 $(27)$1,039 
Customer relationships
(10-15 years)
6,340 (3,080)3,260 5,000 (2,375)2,625 
Developed and core technology
(5-15 years)
4,520 (3,693)827 4,080 (3,335)745 
Distribution rights (10 years)
308 (281)27 325 (269)56 
Patents (10 years)
29,388 (10,790)18,598 24,518 (9,015)15,503 
Trademarks and trade names
(10 years)
450 (295)155 800 (599)201 
Total intangible assets, net$42,653 $(18,183)$24,470 $35,789 $(15,620)$20,169 
(1)This table excludes the gross value of fully amortized intangible assets totaling $43.7 million and $43.2 million on December 31, 2022 and 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:
 Year Ended December 31,
(In thousands)202220212020
Cost of sales$49 $27 $— 
Selling, general and administrative expenses3,969 3,963 6,500 
Total amortization expense$4,018 $3,990 $6,500 
 

Estimated future annual amortization expense related to our intangible assets at December 31, 2022, is as follows: 
(In thousands) 
2023$4,821 
20244,545 
20253,705 
20263,188 
20272,596 
Thereafter5,615 
Total$24,470 

The remaining weighted average amortization period of our intangible assets at December 31, 2022 is 6.2 years.