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Intangible Assets
 9 Months Ended
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 technologies28,567 29,039 
Customer relationships24,636 24,666 
Trademarks12,080 11,708 
Licenses8,108 5,108 
Licenses-related party7,500 7,500 
Other6,257 5,693 
     Total intangible assets117,676 110,589 
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 yearAmount
2021 (balance of year)$9,211 
20228,377 
20237,964 
20247,352 
20256,274 
Thereafter34,911 
     Total$74,089