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Goodwill and Intangible Assets, Net | 12 Months Ended
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Dec. 31, 2020
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, 2018 | $ | 48,485 |
Foreign exchange effects | (38) |
Balance at December 31, 2019 | 48,447 |
Foreign exchange effects | 167 |
Balance at December 31, 2020 | $ | 48,614 |
We conducted annual goodwill impairment reviews on December 31, 2020, 2019, and 2018. 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,
| 2020 |  | 2019
(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 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) | 2020 |  | 2019 |  | 2018
Cost of sales | $ | — |  |  | $ | — |  |  | $ | 103 |
Selling, general and administrative expenses | 6,500 |  |  | 7,192 |  |  | 7,081 |
Total amortization expense | $ | 6,500 |  |  | $ | 7,192 |  |  | $ | 7,184 |
Estimated future annual amortization expense related to our intangible assets at December 31, 2020, is as follows:
(In thousands) |
2021 | $ | 3,259 |
2022 | 3,386 |
2023 | 3,240 |
2024 | 2,419 |
2025 | 2,150 |
Thereafter | 5,256 |
Total | $ | 19,710 |
The remaining weighted average amortization period of our intangible assets is 6.6 years.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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