Intangible Assets

3 Months Ended

Apr. 02, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

In connection with our acquisitions of Silicon Image in March 2015 and SiliconBlue in December 2011 we recorded identifiable intangible assets related to developed technology, customer relationships, licensed technology, patents, and in-process research and development based on guidance for determining fair value under the provisions of ASC 820, "Fair Value Measurements and Disclosures." Additionally, during fiscal 2015, we licensed additional third-party technology.

The following table summarizes the details of our total purchased intangible assets:



	Weighted Average Amortization Period (in years)	Gross		Accumulated Amortization			Intangible assets, net of amortization
(In thousands)							April 2, 2016
Developed technology	4.7	$	131,844	$	(35,801	)	$	96,043
Customer relationships	5.5	30,800		(10,142		)	20,658
Licensed technology	2.5	2,127		(758		)	1,369
Patents	5	769		(164		)	605
Total identified finite-lived intangible assets		165,540		(46,865		)	118,675
In-process research and development	indefinite	35,000		—			35,000
Total identified intangible assets		$	200,540	$	(46,865	)	$	153,675

We do not believe there is any significant residual value associated with these intangible assets. We are amortizing the intangible assets using the straight-line method over their estimated useful lives. We recorded amortization expense on the Consolidated Statements of Operations as follows:



	Three Months Ended
(In thousands)	April 2, 2016		April 4, 2015
Research and development	$	186	$	61
Amortization of acquired intangible assets	8,721		2,942
	$	8,907	$	3,003

The annual expected amortization expense related to acquired intangible assets with finite lives is as follows:



(In thousands)	Amount
2016 (remaining 9 months)	$	26,169
2017	33,275
2018	26,793
2019	24,009
2020	6,063
Thereafter	2,366
Total	$	118,675