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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2015
Stock-based Compensation Expense
The stock-based compensation related to all of our stock-based awards and employee stock purchases for the year ended December 31, 2015, 2014 and 2013 is as follows (in thousands):
 
For the Year Ended December 31,
 
2015
 
2014
 
2013
Cost of net revenues
$
3,938

 
$
3,616

 
$
2,565

Selling, general and administrative
40,813

 
29,625

 
20,354

Research and development
8,192

 
6,582

 
3,519

Total stock-based compensation
$
52,943

 
$
39,823

 
$
26,438

Stock Option Activity
Activity for the year ended December 31, 2015, under the stock option plans are set forth below (in thousands, except years and per share amounts): 
 
Stock Options
 
Number of
Shares
Underlying
Stock Options
 
Weighted
Average
Exercise
Price per Share
 
Weighted Average
Remaining
Contractual Term
(in years )
 
Aggregate
Intrinsic
Value
Outstanding as of December 31, 2014
668

 
15.57

 
 
 
 
Granted

 

 
 
 
 
Exercised
(172
)
 
16.82

 
 
 
 
Cancelled or expired

 

 
 
 
 
Outstanding as of December 31, 2015
496

 
$
15.14

 
2.05
 
$
25,163

Vested and expected to vest at December 31, 2015
496

 
$
15.14

 
2.05
 
$
25,163

Exercisable at December 31, 2015
496

 
$
15.14

 
2.05
 
$
25,163

Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Method Used
The following weighted-average assumptions used in the Monte Carlo simulation were as follows: 
 
Year Ended December 31,
 
2015
 
2014
 
2013
Expected term (in years)
3

 
3

 
3

Expected volatility
36.9
%
 
46.0
%
 
47.0
%
Risk-free interest rate
1.0
%
 
0.7
%
 
0.4
%
Expected dividends

 

 

Weighted average fair value per share at grant date
$
61.73

 
$
50.46

 
$
35.49

2001 Purchase Plan  
Weighted Average Assumptions Used for the Fair Value of Options Component of Purchase Plan Granted Estimated at Grant Date
The fair value of the option component of the Purchase Plan shares was estimated at the grant date using the Black-Scholes option pricing model with the following weighted average assumptions:
 
Year Ended December 31,
  
2015
 
2014
 
2013
Employee Stock Purchase Plan:
 
 
 
 
 
Expected term (in years)
1.2

 
1.2

 
1.2

Expected volatility
31.1
%
 
38.8
%
 
44.9
%
Risk-free interest rate
0.3
%
 
0.2
%
 
0.2
%
Expected dividends

 

 

Weighted average fair value at grant date
$
16.19

 
$
17.15

 
$
11.69

Stock Option  
Weighted Average Assumptions Used for the Fair Value of Options Component of Purchase Plan Granted Estimated at Grant Date
Activity for the year ended December 31, 2015, under the stock option plans are set forth below (in thousands, except years and per share amounts): 
 
Stock Options
 
Number of
Shares
Underlying
Stock Options
 
Weighted
Average
Exercise
Price per Share
 
Weighted Average
Remaining
Contractual Term
(in years )
 
Aggregate
Intrinsic
Value
Outstanding as of December 31, 2014
668

 
15.57

 
 
 
 
Granted

 

 
 
 
 
Exercised
(172
)
 
16.82

 
 
 
 
Cancelled or expired

 

 
 
 
 
Outstanding as of December 31, 2015
496

 
$
15.14

 
2.05
 
$
25,163

Vested and expected to vest at December 31, 2015
496

 
$
15.14

 
2.05
 
$
25,163

Exercisable at December 31, 2015
496

 
$
15.14

 
2.05
 
$
25,163

Restricted Stock Units (RSUs)  
Summary Of Nonvested Shares
A summary for the year ended December 31, 2015, is as follows (in thousands, except years and per share amounts):
 
 
Shares
Underlying  RSUs
 
Weighted Average Grant Date Fair Value
 
Weighted
Remaining
Vesting Period
(in years)
 
Aggregate
Intrinsic
Value
Nonvested as of December 31, 2014
2,124

 
$
42.08

 
 
 
 
Granted
843

 
57.78

 
 
 
 
Vested and released
(781
)
 
38.41

 
 
 
 
Forfeited
(107
)
 
49.42

 
 
 
 
Nonvested as of December 31, 2015
2,079

 
$
49.45

 
1.16
 
$
136,857

Market Performance Based Restricted Stock Units  
Summary Of Nonvested Shares
The following table summarizes the MSU performance as of December 31, 2015:
 
Number of  Shares
Underlying MSUs
(in thousands)
 
Weighted Average Grant Date Fair Value
 
Weighted  Average
Remaining
Vesting Period
(in years )
 
Aggregate
Intrinsic  Value
(in thousands)
Nonvested as of December 31, 2014
498

 
42.00

 

 


Granted
289

 
55.92

 
 
 
 
Vested and released
(162
)
 
30.28

 
 
 
 
Forfeited
(14
)
 
53.69

 
 
 
 
Nonvested as of December 31, 2015
611

 
51.41

 
1.30
 
$
40,244