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Goodwill and Intangible Assets, Net (Tables) | 12 Months Ended
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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, 2019 | 48,447 |
Foreign exchange effects | 167 |
Balance at December 31, 2020 | $ | 48,614 |
Components of Intangible Assets | 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 by Income Statement Caption | 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 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 |
2022 | 3,386 |
2023 | 3,240 |
2024 | 2,419 |
2025 | 2,150 |
Thereafter | 5,256 |
Total | $ | 19,710 |

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