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Intangible Assets
 3 Months Ended
Apr. 02, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
9. Intangible Assets, net
Intangible assets, net, consist of the following (in thousands):
April 2,
2022		January 1,
2022
Patents$31,459 $31,513 
Acquired technologies28,213 28,371 
Customer relationships24,614 24,624 
Trademarks12,558 12,210 
Licenses8,698 8,108 
Licenses-related party7,500 7,500 
Other7,000 6,203 
     Total intangible assets120,042 118,529 
Accumulated amortization(47,764)(46,027)
     Intangible assets, net$72,278 $72,502 
Intangible assets have a weighted-average amortization period of twelve years. Total amortization expense for each of the three months ended April 2, 2022 and April 3, 2021 was $2.5 million, respectively.
Total renewal costs for patents and trademarks for the three months ended April 2, 2022 and April 3, 2021 were $0.4 million and $0.2 million, respectively. As of April 2, 2022, the weighted-average number of years until the next renewal was two years for patents and six years for trademarks.
Estimated amortization expense for each of the next fiscal years is as follows (in thousands):
Fiscal yearAmount
2022 (balance of year)$9,142 
20237,894 
20247,471 
20256,507 
20265,610 
Thereafter35,654 
     Total$72,278