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Intangible Assets
 3 Months Ended
Apr. 04, 2015
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. The following table summarizes the details of our total purchased intangible assets:
(In thousands)
 
Weighted Average Amortization Period (in years)
 
Gross
 
Accumulated Amortization
 
Intangible assets, net of amortization April 4, 2015
Developed technology
 
4.7
 
$
135,700

 
$
(6,873
)
 
$
128,827

Customer relationships
 
5.5
 
37,258

 
(5,032
)
 
32,226

Licensed technology
 
2.5
 
1,852

 
(50
)
 
1,802

Patents
 
5
 
769

 
(11
)
 
758

     Total identified finite-lived intangible assets
 
 
 
175,579

 
(11,966
)
 
163,613

In-process research and development
 
indefinite
 
35,000

 
—

 
35,000

     Total identified intangible assets
 
 
 
$
210,579

 
$
(11,966
)
 
$
198,613




We recorded amortization expense on the Consolidated Statements of Operations as follows:

 
Three Months Ended
(In thousands)
April 4, 2015
 
March 29, 2014
Research and development
$
61

 
$
—

Amortization of acquired intangible assets
2,942

 
737

 
$
3,003

 
$
737




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

(In thousands)
Amount
2015 (remaining 9 months)
$
27,491

2016
36,452

2017
35,635

2018
29,752

Thereafter
34,283

Total
$
163,613