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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 9 Months Ended
Sep. 30, 2013
Accounting Policies [Abstract]  
Schedule of accumulated other comprehensive loss
The components of accumulated other comprehensive loss were as follows (in thousands):
 
September 30,
2013
 
December 31,
2012
Foreign currency translation adjustment
$
(4,593
)
 
$
(4,613
)
Accumulated net unrealized loss on investments, net of tax
(1,842
)
 
(1,905
)
Total accumulated other comprehensive loss
$
(6,435
)
 
$
(6,518
)
Calculation of basic and diluted net income per share
The following table sets forth the calculation of basic and diluted net income per share (in thousands, except per share data):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
Numerator:
2013
 
2012
 
2013
 
2012
 
Net income
$
11,052

 
$
6,779

 
$
16,935

 
$
5,201

Denominator:
 

 
 

 
 

 
 

Denominator for basic net income per share — weighted-average outstanding shares
27,758

 
27,243

 
27,607

 
26,279

Effect of dilutive securities:
 

 
 

 
 

 
 

Stock options and restricted stock
591

 
430

 
530

 
412

Denominator for diluted net income per share — weighted-average outstanding shares
28,349

 
27,673

 
28,137

 
26,691

 
 

 
 

 
 

 
 

Net income per share — basic 
$
0.40

 
$
0.25

 
$
0.61

 
$
0.20

Net income per share — diluted 
$
0.39

 
$
0.24

 
$
0.60

 
$
0.19
Stock-based compensation expense for stock options and restricted stock
Stock-based compensation expense for stock options and restricted stock issued under equity incentive plans and stock purchases under the ESPP included in the Company’s results of operations were as follows (in thousands):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2013
 
2012
 
2013
 
2012
Cost of revenues
$
1,061

 
$
849

 
$
3,353

 
$
1,784

Selling and marketing
944

 
493

 
3,763

 
1,331

Software development
1,608

 
809

 
5,439

 
1,565

General and administrative
4,175

 
1,588

 
19,715

 
3,987

Total stock-based compensation
$
7,788

 
$
3,739

 
$
32,270

 
$
8,667