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Intangible Assets | 9 Months Ended
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Sep. 26, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | 9. Intangible Assets Intangible assets, net, consist of the following (in thousands):
| September 26, 2020 |  | December 28, 2019
Patents | $ | 28,286 |  |  | $ | 23,242 |
Customer relationships | 23,619 |  |  | 7,669 |
Acquired technologies | 12,176 |  |  | 5,580 |
Trademarks | 9,507 |  |  | 4,614 |
Licenses-related party | 7,500 |  |  | 7,500 |
Capitalized software development costs | 3,366 |  |  | 3,328 |
Other | 7,073 |  |  | 5,466 |
Total intangible assets | 91,527 |  |  | 57,399 |
Accumulated amortization | (34,221) |  |  | (30,148) |
Intangible assets, net | $ | 57,306 |  |  | $ | 27,251 |
Intangible assets have a weighted-average amortization period of twelve years. Total amortization expense for the three months ended September 26, 2020 and September 28, 2019 was $1.6 million and $1.1 million, respectively. Total amortization expense for the nine months ended September 26, 2020 and September 28, 2019 was $5.2 million and $3.3 million, respectively. Total renewal costs for patents and trademarks for the three months ended September 26, 2020 and September 28, 2019 were $0.6 million and $0.7 million, respectively. Total renewal costs for patents and trademarks for the nine months ended September 26, 2020 and September 28, 2019 were $1.2 million and $1.1 million, respectively. As of September 26, 2020, the weighted-average number of years until the next renewal was two years for patents and five years for trademarks. During the three months ended March 28, 2020, the Company completed an immaterial business combination. Based on the Company’s preliminary purchase price allocation, approximately $15.5 million, $2.6 million and $1.7 million of the purchase price was assigned to customer relationships, acquired technologies and trademarks, respectively. During the three months ended June 27, 2020, the Company completed another immaterial business combination. Based on the Company’s preliminary purchase price allocation, approximately $6.3 million, $2.4 million, $0.4 million and $0.3 million of the purchase price was assigned to acquired technologies, trademarks, customer relationships and other intangibles, respectively. The Company is still gathering additional information to finalize these preliminary estimates and expects to finalize the purchase price allocations as soon as practicable, but no later than one year from the acquisition dates. Estimated amortization expense for each of the next fiscal years is as follows (in thousands):
Fiscal year | Amount
2020 (balance of year) | $ | 7,083 |
2021 | 7,011 |
2022 | 5,691 |
2023 | 5,243 |
2024 | 4,880 |
Thereafter | 27,398 |
Total | $ | 57,306 |

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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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