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Intangible Assets, Net and Goodwill | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets, Net and Goodwill | INTANGIBLE ASSETS, NET Intangible 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, and are measured for impairment only when events or circumstances indicate the carrying value may be impaired. Goodwill and intangible assets with indefinite useful lives, including trademarks and trade names, are not amortized but are evaluated for impairment on an annual basis during the fourth quarter of our fiscal year or earlier if events or circumstances indicate the carrying value may be impaired. Intangible Assets The following table summarizes the Company's identifiable intangible assets (in thousands):
| September 30, 2018 |  | December 31, 2017 |  | September 30, 2017
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 | (11,649 | ) |  | (10,651 | ) |  | (10,319 | )
Customer relationships | (13,650 | ) |  | (12,413 | ) |  | (12,000 | )
Total accumulated amortization | (25,299 | ) |  | (23,064 | ) |  | (22,319 | )
Net carrying amount | 11,899 |  |  | 14,134 |  |  | 14,879 |
Intangible assets not subject to amortization | 115,421 |  |  | 115,421 |  |  | 115,421 |
Intangible assets, net | $ | 127,320 |  |  | $ | 129,555 |  |  | $ | 130,300 |
Amortization expense for intangible assets subject to amortization was approximately $745,000 for the three months ended September 30, 2018 and 2017, respectively, and was approximately $2,235,000 and $3,138,000 for the nine months ended September 30, 2018 and 2017, respectively. Annual amortization expense is estimated to be as follows for the years 2018 through 2022 (in thousands):
2018 | $ | 2,980 |
2019 | 2,980 |
2020 | 2,537 |
2021 | 1,650 |
2022 | 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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