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Intangible Assets, Net and Goodwill | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets, Net and Goodwill | ible assets that are determined to have finite lives include patents, purchased technology and customer relationships and are amortized over their estimated useful lives, which range from approximately 3 to 10 years. Goodwill and intangible assets with indefinite useful lives, including trademarks and trade names, are not amortized but are periodically evaluated for impairment. At December 31, 2018 and 2017, the Company determined that its goodwill and intangible assets were not impaired. Intangible assets The following table summarizes the Company's identifiable Intangible assets, net balance:
|  | December 31,
(in thousands) |  | 2018 |  | 2017
Intangible assets subject to amortization: |  |  |  |
Patents and purchased technology |  | $ | 14,198 |  |  | $ | 14,198 |
Customer relationships |  | 23,000 |  |  | 23,000 |
Gross carrying amount |  | 37,198 |  |  | 37,198 |
Accumulated amortization: |  |  |  |
Patents and purchased technology |  | (11,981 | ) |  | (10,651 | )
Customer relationships |  | (14,063 | ) |  | (12,413 | )
Accumulated amortization |  | (26,044 | ) |  | (23,064 | )
Net carrying amount |  | 11,154 |  |  | 14,134 |
Intangible assets not subject to amortization |  | 115,421 |  |  | 115,421 |
Intangible assets, net |  | $ | 126,575 |  |  | $ | 129,555 |
Amortization expense for intangible assets subject to amortization was approximately $2,980,000, $3,883,000, and $5,146,000 for the years ended December 31, 2018, 2017 and 2016, respectively. The following table presents the estimated annual amortization expense for the years 2019 through 2023:
(in thousands) |
2019 | $ | 2,980 |
2020 | 2,537 |
2021 | 1,650 |
2022 | 1,650 |
2023 | 1,650 |

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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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