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Goodwill and Intangible Assets, Net (Tables) | 3 Months Ended
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Mar. 31, 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 | (87) |
Balance at March 31, 2021 | $ | 48,527 |
Components of Intangible Assets, Net | The components of intangible assets, net were as follows:
| March 31, 2021 |  | December 31, 2020
(In thousands) | Gross (1) |  | Accumulated Amortization (1) |  | Net |  | Gross (1) |  | Accumulated Amortization (1) |  | Net
Capitalized software development costs | $ | 703 |  |  | $ | (4) |  |  | $ | 699 |  |  | $ | 477 |  |  | $ | — |  |  | $ | 477 |
Customer relationships | 8,100 |  |  | (4,506) |  |  | 3,594 |  |  | 8,100 |  |  | (4,329) |  |  | 3,771 |
Developed and core technology | 4,080 |  |  | (3,117) |  |  | 963 |  |  | 4,080 |  |  | (3,044) |  |  | 1,036 |
Distribution rights | 336 |  |  | (256) |  |  | 80 |  |  | 352 |  |  | (261) |  |  | 91 |
Patents | 22,287 |  |  | (7,931) |  |  | 14,356 |  |  | 21,601 |  |  | (7,574) |  |  | 14,027 |
Trademarks and trade names | 800 |  |  | (519) |  |  | 281 |  |  | 800 |  |  | (492) |  |  | 308 |
Total intangible assets, net | $ | 36,306 |  |  | $ | (16,333) |  |  | $ | 19,973 |  |  | $ | 35,410 |  |  | $ | (15,700) |  |  | $ | 19,710 |
(1)This table excludes the gross value of fully amortized intangible assets totaling $42.8 million and $42.7 million at March 31, 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 March 31,
2021 |  | 2020
Cost of sales | $ | 4 |  |  | $ | — |
Selling, general and administrative expenses | 834 |  |  | 1,800 |
Total amortization expense | $ | 838 |  |  | $ | 1,800 |
Estimated Future Amortization Expense Related to Intangible Assets | Estimated future annual amortization expense related to our intangible assets at March 31, 2021, was as follows:
(In thousands) |
2021 (remaining 9 months) | $ | 2,514 |
2022 | 3,586 |
2023 | 3,424 |
2024 | 2,508 |
2025 | 2,239 |
Thereafter | 5,702 |
Total | $ | 19,973 |

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