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Intangible Assets
 3 Months Ended
Apr. 03, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
9. Intangible Assets, net
Intangible assets, net, consist of the following (in thousands):
April 3,
2021		January 2,
2021
Acquired technologies$28,955 $29,039 
Patents27,996 26,875 
Customer relationships24,664 24,666 
Trademarks11,975 11,708 
Licenses-related party7,500 7,500 
Other10,801 10,801 
     Total intangible assets111,891 110,589 
Accumulated amortization(38,954)(36,666)
     Intangible assets, net$72,937 $73,923 
Intangible assets have a weighted-average amortization period of twelve years. Total amortization expense for the three months ended April 3, 2021 and March 28, 2020 was $2.5 million and $1.4 million, respectively.
Total renewal costs for patents and trademarks for each of the three months ended April 3, 2021 and March 28, 2020 were $0.2 million. As of April 3, 2021, the weighted-average number of years until the next renewal was one year for patents and six years for trademarks.
Estimated amortization expense for each of the next fiscal years is as follows (in thousands):
Fiscal yearAmount
2021 (balance of year)$8,865 
20228,104 
20237,387 
20247,020 
20255,837 
Thereafter35,724 
     Total$72,937