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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Compensation Expense Related to Stock-Based Compensation Plans
Total stock-based compensation expense, related to all of the Company’s share-based awards, was comprised as follows (in millions):
 
Year ended December 31,
 
2014
 
2013
 
2012
Cost of sales
$
0.6

 
$
0.8

 
$
0.6

Research and development
1.1

 
1.9

 
1.1

Sales and marketing
1.1

 
0.9

 
0.6

General and administrative
3.9

 
5.2

 
4.3

 
$
6.7

 
$
8.8

 
$
6.6
Estimated Fair Value of Each Stock Option Award
The estimated fair value of each stock option award was determined on the date of grant using the Black-Scholes option valuation model with the following weighted-average assumptions for the option grants:
 
Year ended December 31,
 
2014
 
2013
 
2012
Risk-free interest rate
1.59
%
 
0.86
%
 
0.83
%
Expected option life (in years)
5.78

 
5.53

 
5.52

Volatility rate
42
%
 
44
%
 
46
%
Dividend rate
—
%
 
—
%
 
—
%
Summary of Status of Stock Option Activity
A summary of the status of stock option activity for the years ended December 31, 2012, 2013 and 2014 is as follows (in thousands, except price data and years):
 
Number
of Shares
 
Weighted-
average exercise
price per
share
 
Weighted-
average remaining
contractual
term (in years)
 
Aggregate
intrinsic
value
Outstanding at January 1, 2012
3,417

 
$
12.60

 
 
 
 
Granted
624

 
15.23

 
 
 
 
Exercised
(351
)
 
11.85

 
 
 
 
Cancelled
(90
)
 
11.94

 
 
 
 
Outstanding at December 31, 2012
3,600

 
13.15

 
 
 
 
Granted
529

 
22.36

 
 
 
 
Exercised
(642
)
 
12.16

 
 
 
 
Cancelled
(13
)
 
10.61

 
 
 
 
Outstanding at December 31, 2013
3,474

 
14.74

 
 
 
 
Granted
559

 
26.63

 
 
 
 
Exercised
(251
)
 
13.67

 
 
 
 
Cancelled
(175
)
 
20.63

 
 
 
 
Outstanding at December 31, 2014
3,607

 
$
16.37

 
6.08
 
$
41,157

Vested and expected to vest at December 31, 2014
3,461

 
$
16.04

 
5.97
 
$
40,629

Exercisable at December 31, 2014
2,330

 
$
13.33

 
4.89
 
$
33,667

Available for future grant at December 31, 2014
2,162

 
 
 
 
 
 
Summary of Status of Stock Awards Activity
A summary of the status of stock awards activity for the years ended December 31, 2012, 2013 and 2014 is as follows (in thousands, except price data):
 
Shares
 
Weighted-average
grant date
fair value
Non-vested at January 1, 2012
502

 
$
13.65

Granted
145

 
15.69

Vested
(107
)
 
15.29

Forfeited
(18
)
 
13.81

Non-vested at December 31, 2012
522

 
13.87

Granted
74

 
23.53

Vested
(141
)
 
23.43

Forfeited
(1
)
 
15.26

Non-vested at December 31, 2013
454

 
16.22

Granted
145

 
25.73

Vested
(174
)
 
28.27

Forfeited
(23
)
 
18.19

Non-vested at December 31, 2014
402

 
$
14.84