Intangible Assets

9 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

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



	September 30, 2017			December 31, 2016
Patents	$	20,715		$	19,950
Customer relationships	7,669			7,669
Licenses	7,500			7,500
Acquired technology	5,580			5,580
Trademarks	3,990			3,777
Capitalized software development costs	2,606			2,539
Other	3,681			3,674
Total intangible assets	51,741			50,689
Accumulated amortization	(24,252		)	(21,313		)
Intangible assets, net	$	27,489		$	29,376

Total amortization expense for the nine months ended September 30, 2017 and October 1, 2016 was $3.7 million and $2.8 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
2017 (balance of year)	$	5,343
2018	4,769
2019	3,710
2020	3,362
2021	2,330
Thereafter	7,975
Total	$	27,489