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Intangible Assets, Net | 3 Months Ended
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Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets, Net | Intangible assets, net consisted of the following:
(in thousands) |  | March 31, 2020 |  | December 31, 2019 |  | March 31, 2019
Intangible assets subject to amortization: |  |  |  |  |  |
Patents and purchased technology |  | $ | 14,198 |  |  | $ | 14,198 |  |  | $ | 14,198 |
Customer relationships |  | 23,000 |  |  | 23,000 |  |  | 23,000 |
Gross carrying amount |  | 37,198 |  |  | 37,198 |  |  | 37,198 |
Accumulated amortization: |  |  |  |  |  |
Patents and purchased technology |  | (13,644) |  |  | (13,311) |  |  | (12,314) |
Customer relationships |  | (16,125) |  |  | (15,713) |  |  | (14,475) |
Total accumulated amortization |  | (29,769) |  |  | (29,024) |  |  | (26,789) |
Net carrying amount |  | 7,429 |  |  | 8,174 |  |  | 10,409 |
Intangible assets not subject to amortization |  | 115,421 |  |  | 115,421 |  |  | 115,421 |
Intangible assets, net |  | $ | 122,850 |  |  | $ | 123,595 |  |  | $ | 125,830 |
Amortization expense for intangible assets subject to amortization was $0.7 million for each of the three months ended March 31, 2020 and 2019. Annual amortization expense is estimated to be as follows 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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