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Goodwill and Intangible Assets, Net | 3 Months Ended
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Mar. 31, 2021
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 | (87) |
Balance at March 31, 2021 | $ | 48,527 |
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. 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 March 31,
2021 |  | 2020
Cost of sales | $ | 4 |  |  | $ | — |
Selling, general and administrative expenses | 834 |  |  | 1,800 |
Total amortization expense | $ | 838 |  |  | $ | 1,800 |
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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- 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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