Intangible Assets

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

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



	June 30, 2018			December 30, 2017
Patents	$	19,833		$	20,623
Customer relationships	7,669			7,669
Licenses-related party	7,500			7,500
Acquired technology	5,580			5,580
Trademarks	4,168			4,036
Capitalized software development costs	2,998			2,699
Other	5,466			3,691
Total intangible assets	53,214			51,798
Accumulated amortization	(25,235		)	(24,675		)
Intangible assets, net	$	27,979		$	27,123

Total amortization expense for the three months ended June 30, 2018 and July 1, 2017 was $1.4 million and $1.0 million, respectively. Total amortization expense for the six months ended June 30, 2018 and July 1, 2017 was $2.5 million and $2.1 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)	$	4,288
2019	3,787
2020	3,630
2021	3,395
2022	1,848
Thereafter	11,031
Total	$	27,979