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Intangible Assets
 6 Months Ended
Jul. 02, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets

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 as of the end of the second quarter of fiscal 2016:
 
 
Weighted Average Amortization Period (in years)
 
Gross
 
Accumulated Amortization
 
Intangible assets, net of amortization
(In thousands)
 
 
 
 
 
 
 
July 2, 2016
Developed technology
 
4.7
 
$
128,759

 
$
(41,197
)
 
$
87,562

Customer relationships
 
5.9
 
30,800

 
(11,446
)
 
19,354

Licensed technology
 
3.3
 
2,127

 
(906
)
 
1,221

Patents
 
5
 
769

 
(203
)
 
566

     Total identified finite-lived intangible assets
 
 
 
162,455

 
(53,752
)
 
108,703

In-process research and development
 
indefinite
 
34,941

 
—

 
34,941

     Total identified intangible assets
 
 
 
$
197,396

 
$
(53,752
)
 
$
143,644




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
 
Six Months Ended
(In thousands)
July 2,
2016
 
July 4,
2015
 
July 2,
2016
 
July 4,
2015
Research and development
$
187

 
$
223

 
$
373

 
$
284

Amortization of acquired intangible assets
8,311

 
8,941

 
17,032

 
11,883

 
$
8,498

 
$
9,164

 
$
17,405

 
$
12,167




The annual expected amortization expense related to acquired intangible assets with finite lives is as follows:
(In thousands)
Amount
2016 (remaining 6 months)
$
16,752

2017
32,687

2018
26,804

2019
24,021

2020
6,073

Thereafter
2,366

Total
$
108,703