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Intangible Assets | 9 Months Ended
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Oct. 02, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | 9. Intangible Assets, net Intangible assets, net, consist of the following (in thousands):
| October 2, 2021 |  | January 2, 2021
Patents | $ | 30,528 |  |  | $ | 26,875 |
Acquired technologies | 28,567 |  |  | 29,039 |
Customer relationships | 24,636 |  |  | 24,666 |
Trademarks | 12,080 |  |  | 11,708 |
Licenses | 8,108 |  |  | 5,108 |
Licenses-related party | 7,500 |  |  | 7,500 |
Other | 6,257 |  |  | 5,693 |
Total intangible assets | 117,676 |  |  | 110,589 |
Accumulated amortization | (43,587) |  |  | (36,666) |
Intangible assets, net | $ | 74,089 |  |  | $ | 73,923 |
Intangible assets have a weighted-average amortization period of twelve years. Total amortization expense for the three months ended October 2, 2021 and September 26, 2020 was $2.7 million and $1.6 million, respectively. Total amortization expense for the nine months ended October 2, 2021 and September 26, 2020 was $7.6 million and $5.2 million, respectively. Total renewal costs for patents and trademarks for the three months ended October 2, 2021 and September 26, 2020 were $0.9 million and $0.6 million, respectively. Total renewal costs for patents and trademarks for the nine months ended October 2, 2021 and September 26, 2020 were $1.3 million and $1.2 million, respectively. As of October 2, 2021, the weighted-average number of years until the next renewal was two years for patents and four 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) | $ | 9,211 |
2022 | 8,377 |
2023 | 7,964 |
2024 | 7,352 |
2025 | 6,274 |
Thereafter | 34,911 |
Total | $ | 74,089 |

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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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