Goodwill and Intangible Assets
 12 Months Ended
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Intangible Assets
Goodwill
The changes in the carrying amount of goodwill for the fiscal years ended December 31, 2013 and 2012 are as follows (in thousands):
 
Goodwill
Balance as of December 31, 2011
$
24,416

Acquisitions
6,791

Balance as of December 31, 2012
$
31,207

Acquisitions
—

Balance as of December 31, 2013
$
31,207


    
Intangible assets consisted of the following as of December 31, 2013 and 2012 (in thousands):
 
December 31,
2012 Cost
 
December 31,
2012 Net
 
Additions
 
Amortization
Expense
 
December 31,
2013 Net
 
Weighted
Average
Amortization
Period (Years)
Developed technology
$
20,576

 
$
12,384

 
$
611

 
$
(3,326
)
 
$
9,669

 
4.3
Customer relationships
8,154

 
4,952

 
—

 
(876
)
 
4,076

 
4.9
Tradenames
1,522

 
1,040

 
—

 
(212
)
 
828

 
5.2
Favorable lease
40

 
1

 
13

 
(14
)
 
—

 
N/A
Patents and licenses
3,059

 
2,744

 
—

 
(351
)
 
2,393

 
7.6
Other
142

 
75

 
—

 
(46
)
 
29

 
0.5
Total
$
33,493

 
$
21,196

 
$
624

 
$
(4,825
)
 
$
16,995

 
 

 
December 31,
2011 Cost
 
December 31,
2011 Net
 
Additions
 
Amortization
Expense
 
December 31,
2012 Net
 
Weighted
Average
Amortization
Period (Years)
Developed technology
$
15,179

 
$
10,626

 
$
5,397

 
$
(3,639
)
 
$
12,384

 
5.1
Customer relationships
6,884

 
4,542

 
1,270

 
(860
)
 
4,952

 
5.8
Tradenames
1,202

 
942

 
320

 
(222
)
 
1,040

 
5.9
Favorable lease
40

 
14

 
—

 
(13
)
 
1

 
0.0
Patents and licenses
1,525

 
1,522

 
1,534

 
(312
)
 
2,744

 
8.4
Other
142

 
123

 
—

 
(48
)
 
75

 
1.5
Total
$
24,972

 
$
17,769

 
$
8,521

 
$
(5,094
)
 
$
21,196

 
 

Intangible assets include third-party software licenses used in our products and acquired assets related to the Company's acquisitions. Costs incurred to renew or extend the term of a recognized intangible asset are expensed in the period incurred.
Amortization expense related to intangible assets was $4.8 million, $5.1 million and $3.5 million in 2013, 2012 and 2011, respectively, and was charged to cost of revenue for purchased technology, sales and marketing expense for customer relationships and general and administrative expense for the favorable lease and other. The Company's intangible assets are amortized over their estimated useful lives of one to twelve years. Total future expected amortization is as follows (in thousands):
 
Developed
Technology
 
Customer
Relationships
 
Tradenames
 
Patents and
Licenses
 
Other
Year Ending December 31:
 
 
 
 
 
 
 
 
 
2014
$
2,524

 
$
873

 
$
179

 
$
349

 
$
29

2015
2,118

 
873

 
179

 
343

 
—

2016
2,123

 
876

 
151

 
344

 
—

2017
1,813

 
768

 
142

 
343

 
—

2018
1,082

 
502

 
100

 
313

 
—

2019 and beyond
9

 
184

 
77

 
701

 
—

Total expected amortization expense
$
9,669

 
$
4,076

 
$
828

 
$
2,393

 
$
29