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Intangible Assets, Net and Goodwill | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets, Net and Goodwill | Intangible assets, net consisted of the following:
|  | December 31, |  |
(in thousands) |  | 2019 |  | 2018
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 |  | (13,311) |  |  | (11,981) |
Customer relationships |  | (15,713) |  |  | (14,063) |
Accumulated amortization |  | (29,024) |  |  | (26,044) |
Net carrying amount |  | 8,174 |  |  | 11,154 |
Intangible assets not subject to amortization |  | 115,421 |  |  | 115,421 |
Intangible assets, net |  | $ | 123,595 |  |  | $ | 126,575 |
Amortization expense for intangible assets subject to amortization was $3.0 million for the years ended December 31, 2019 and 2018, respectively, and $3.9 million for the year ended December 31, 2017. At December 31, 2019 and 2018, the Company determined that its goodwill and intangible assets were not impaired. The following table presents the estimated annual amortization expense for the years 2020 through 2024:
(in thousands) |  |
2020 | $ | 2,537 |
2021 | 1,650 |
2022 | 1,650 |
2023 | 1,650 |
2024 | 688 |

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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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