Intangible Assets

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible assets, net, consist of the following (in thousands):



	March 31, 2018			December 30, 2017
Patents	$	21,558		$	20,623
Licenses-related party	8,000			7,500
Customer relationships	7,669			7,669
Acquired technology	5,580			5,580
Trademarks	4,112			4,036
Capitalized software development costs	2,868			2,699
Other	5,466			3,691
Total intangible assets	55,253			51,798
Accumulated amortization	(25,800		)	(24,675		)
Intangible assets, net	$	29,453		$	27,123

Total amortization expense for the three months ended March 31, 2018 and April 1, 2017 was $1.1 million and $1.1 million, respectively. All of these intangible assets have a 10 year weighted average amortization period.

Estimated amortization expense for future fiscal years is as follows (in thousands):



Fiscal year	Amount
2018 (balance of year)	$	5,091
2019	3,748
2020	3,598
2021	3,345
2022	2,173
Thereafter	11,498
Total	$	29,453