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Intangible Assets
 6 Months Ended
Jul. 03, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
9. Intangible Assets, net
Intangible assets, net, consist of the following (in thousands):
July 3,
2021		January 2,
2021
Acquired technologies$29,011 $29,039 
Patents28,839 26,875 
Customer relationships24,667 24,666 
Trademarks12,072 11,708 
Licenses-related party7,500 7,500 
Other14,166 10,801 
     Total intangible assets116,255 110,589 
Accumulated amortization(41,230)(36,666)
     Intangible assets, net$75,025 $73,923 
Intangible assets have a weighted-average amortization period of twelve years. Total amortization expense for the three months ended July 3, 2021 and June 27, 2020 was $2.4 million and $2.1 million, respectively. Total amortization expense for the six months ended July 3, 2021 and June 27, 2020 was $5.0 million and $3.5 million, respectively.
Total renewal costs for patents and trademarks for each of the three months ended July 3, 2021 and June 27, 2020 were $0.2 million and $0.3 million, respectively. Total renewal costs for patents and trademarks for the six months ended July 3, 2021 and June 27, 2020 were $0.4 million and $0.5 million, respectively. As of July 3, 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)$9,377 
20228,304 
20237,817 
20247,455 
20256,173 
Thereafter35,899 
     Total$75,025