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Intangible Assets | 6 Months Ended
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Jun. 29, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | 10. Intangible Assets Intangible assets, net, consist of the following (in thousands):
| June 29, 2019 |  | December 29, 2018
Patents | $ | 22,224 |  |  | $ | 21,323 |
Customer relationships | 7,669 |  |  | 7,669 |
Licenses-related party | 7,500 |  |  | 7,500 |
Acquired technology | 5,580 |  |  | 5,580 |
Trademarks | 4,372 |  |  | 4,190 |
Capitalized software development costs | 3,436 |  |  | 3,430 |
Other | 5,466 |  |  | 5,466 |
Total intangible assets | 56,247 |  |  | 55,158 |
Accumulated amortization | (28,614 | ) |  | (27,234 | )
Intangible assets, net | $ | 27,633 |  |  | $ | 27,924 |
Total amortization expense for the three months ended June 29, 2019 and June 30, 2018 was $1.1 million and $1.5 million, respectively. Total amortization expense for the six months ended June 29, 2019 and June 30, 2018 was $2.2 million and $2.7 million, respectively. All of these intangible assets have a ten year weighted average amortization period. Estimated amortization expense for each of the next fiscal years is as follows (in thousands):
Fiscal year | Amount
2019 (balance of year) | $ | 4,373 |
2020 | 3,842 |
2021 | 3,673 |
2022 | 2,309 |
2023 | 1,719 |
Thereafter | 11,717 |
Total | $ | 27,633 |

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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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