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Intangible Assets | 12 Months Ended
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Jan. 01, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | 9. Intangible Assets, net Intangible assets, net, consist of the following (in thousands):
| January 1, 2022 |  | January 2, 2021
Gross carrying amount |  |  |
Patents | $ | 31,513 |  |  | $ | 26,875 |
Acquired technologies | 28,371 |  |  | 29,039 |
Customer relationships | 24,624 |  |  | 24,666 |
Trademarks | 12,210 |  |  | 11,708 |
Licenses | 8,108 |  |  | 5,108 |
Licenses-related party | 7,500 |  |  | 7,500 |
Other | 6,203 |  |  | 5,693 |
Total gross carrying amount | $ | 118,529 |  |  | $ | 110,589 |
Accumulated amortization |  |  |
Patents | $ | (13,222) |  |  | $ | (10,763) |
Acquired technologies | (7,668) |  |  | (5,259) |
Customer relationships | (7,381) |  |  | (6,486) |
Trademarks | (6,127) |  |  | (3,999) |
Licenses-related party | (5,969) |  |  | (5,594) |
Licenses | (1,975) |  |  | (1,247) |
Other | (3,685) |  |  | (3,318) |
Total accumulated amortization | (46,027) |  |  | (36,666) |
Net carrying amount | $ | 72,502 |  |  | $ | 73,923 |
Intangible assets have a weighted-average amortization period of twelve years. For the years ended January 1, 2022, January 2, 2021 and December 28, 2019, amortization of intangible assets was $10.3 million, $7.5 million and $4.4 million, respectively. As of January 1, 2022 and January 2, 2021, the total costs of patents not yet amortizing was $9.0 million and $8.2 million, respectively. As of January 1, 2022 and January 2, 2021, the total costs of trademarks not yet amortizing was $1.0 million and $0.9 million, respectively. For the years ended January 1, 2022 and January 2, 2021, total renewal costs capitalized for patents and trademarks was $1.5 million and $1.3 million, respectively. As of January 1, 2022, the weighted-average number of years until the next renewal was two years for patents and three years for trademarks. During the first quarter of 2020, the Company completed an immaterial business combination. Based on the Company’s 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 second quarter of 2020, the Company completed another immaterial business combination. Based on the Company’s 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. During the fourth quarter of 2020, the Company obtained a controlling interest in a provider of advanced hemodynamic monitoring solutions. Based on the Company’s purchase price allocation, approximately $14.0 million, $2.3 million, $1.0 million and $1.0 million of the purchase price was assigned to acquired technologies, trademarks, customer relationships and other intangibles, respectively. Subsequently, during the first quarter of 2021, the Company acquired the remaining minority interest. See Note 14 to these consolidated financial statements for further details. Estimated amortization expense for each of the next fiscal years is as follows (in thousands):
Fiscal year | Amount
2022 | $ | 8,242 |
2023 | 8,138 |
2024 | 7,674 |
2025 | 6,864 |
2026 | 5,930 |
Thereafter | 35,654 |
Total | $ | 72,502 |

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