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Intangible Assets | 3 Months Ended
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Mar. 31, 2019
Intangible Assets Net Excluding Goodwill [Abstract] |
Intangible Assets | 11. INTANGIBLE ASSETS Intangible assets include intangibles acquired in conjunction with several acquisitions since 2011, with the most recent being SmartRG, Inc. in November 2018 and SEI’s North American EPON business and technology license and OEM supply agreement with SEI in March 2018. The following table presents our intangible assets as of March 31, 2019 and December 31, 2018:
|  | March 31, 2019 |  |  | December 31, 2018 |
(In thousands) |  | Gross Value |  |  | Accumulated Amortization |  |  | Net Value |  |  | Gross Value |  |  | Accumulated Amortization |  |  | Net Value |
Customer relationships |  | $ | 22,363 |  |  | $ | (5,797 | ) |  | $ | 16,566 |  |  | $ | 22,455 |  |  | $ | (5,380 | ) |  | $ | 17,075 |
Developed technology |  |  | 10,170 |  |  |  | (2,526 | ) |  |  | 7,644 |  |  |  | 12,801 |  |  |  | (4,867 | ) |  |  | 7,934 |
Licensed technology |  |  | 5,900 |  |  |  | (683 | ) |  |  | 5,217 |  |  |  | 5,900 |  |  |  | (520 | ) |  |  | 5,380 |
Supplier relationships |  |  | 2,800 |  |  |  | (1,458 | ) |  |  | 1,342 |  |  |  | 2,800 |  |  |  | (1,108 | ) |  |  | 1,692 |
Licensing agreements |  |  | 560 |  |  |  | (24 | ) |  |  | 536 |  |  |  | 560 |  |  |  | (5 | ) |  |  | 555 |
Patents |  |  | 500 |  |  |  | (174 | ) |  |  | 326 |  |  |  | 500 |  |  |  | (157 | ) |  |  | 343 |
Trade names |  |  | 310 |  |  |  | (124 | ) |  |  | 186 |  |  |  | 310 |  |  |  | (106 | ) |  |  | 204 |
Total |  | $ | 42,603 |  |  | $ | (10,786 | ) |  | $ | 31,817 |  |  | $ | 45,326 |  |  | $ | (12,143 | ) |  | $ | 33,183 |
Amortization expense was $1.3 million and $0.4 million for the three months ended March 31, 2019 and 2018 respectively. As of March 31, 2019, the estimated future amortization expense of our intangible assets is as follows:
(In thousands) |  | Amount |
Remainder of 2019 |  | $ | 3,994 |
2020 |  |  | 4,444 |
2021 |  |  | 4,096 |
2022 |  |  | 3,472 |
2023 |  |  | 3,320 |
Thereafter |  |  | 12,491 |
Total |  | $ | 31,817 |

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- Definition The entire disclosure for all or part of the information related to 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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- References No definition available. + Details
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