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Intangible Assets | 3 Months Ended
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Apr. 03, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | 9. Intangible Assets, net Intangible assets, net, consist of the following (in thousands):
| April 3, 2021 |  | January 2, 2021
Acquired technologies | $ | 28,955 |  |  | $ | 29,039 |
Patents | 27,996 |  |  | 26,875 |
Customer relationships | 24,664 |  |  | 24,666 |
Trademarks | 11,975 |  |  | 11,708 |
Licenses-related party | 7,500 |  |  | 7,500 |
Other | 10,801 |  |  | 10,801 |
Total intangible assets | 111,891 |  |  | 110,589 |
Accumulated amortization | (38,954) |  |  | (36,666) |
Intangible assets, net | $ | 72,937 |  |  | $ | 73,923 |
Intangible assets have a weighted-average amortization period of twelve years. Total amortization expense for the three months ended April 3, 2021 and March 28, 2020 was $2.5 million and $1.4 million, respectively. Total renewal costs for patents and trademarks for each of the three months ended April 3, 2021 and March 28, 2020 were $0.2 million. As of April 3, 2021, the weighted-average number of years until the next renewal was one year for patents and six years for trademarks. Estimated amortization expense for each of the next fiscal years is as follows (in thousands):
Fiscal year | Amount
2021 (balance of year) | $ | 8,865 |
2022 | 8,104 |
2023 | 7,387 |
2024 | 7,020 |
2025 | 5,837 |
Thereafter | 35,724 |
Total | $ | 72,937 |

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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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