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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2014
Equity [Abstract]  
Summary of Restricted Stock Unit Activity
The following table summarizes RSU activity for the years ended December 31, 2014, 2013 and 2012:
 
2014
 
2013
 
2012
 
Number
of
Units
 
Weighted
Average
Grant-Date
Fair Value
 
Number
of
Units
 
Weighted
Average
Grant-Date
Fair Value
 
Number
of
Units
 
Weighted
Average
Grant-Date
Fair Value
Units outstanding, beginning of year
1,279,123

 
$
9.67

 
582,212

 
$
5.42

 
1,096

 
$
4.76

Granted
554,328

 
16.98

 
1,054,293

 
10.72

 
713,148

 
5.40

Released
(432,706
)
 
7.61

 
(257,693
)
 
5.44

 
(97,007
)
 
5.30

Forfeited
(174,657
)
 
13.08

 
(99,689
)
 
6.86

 
(35,025
)
 
5.29

Units outstanding, end of year
1,226,088

 
13.23

 
1,279,123

 
9.67

 
582,212

 
5.42

Aggregate intrinsic value at year end (in thousands)
$
32,467

 
 
 

 
 
 

 
 
Summary of the Company's Stock Options Activity
The following table summarizes stock option activity for the years ended December 31, 2014, 2013 and 2012:
 
2014
 
2013
 
2012
 
Number
of
Options
 
Weighted
Average
Exercise
Price
 
Number
of
Options
 
Weighted
Average
Exercise
Price
 
Number
of
Options
 
Weighted
Average
Exercise
Price
Options outstanding, beginning of year
3,365,692

 
$
6.15

 
6,321,076

 
$
6.05

 
7,576,493

 
$
5.75

Granted
—

 
—

 
—

 
—

 
—

 


Exercised
(1,644,146
)
 
6.69

 
(2,671,058
)
 
5.75

 
(784,383
)
 
2.46

Expired / terminated
(80,463
)
 
16.59

 
(284,326
)
 
7.83

 
(471,034
)
 
7.15

Options outstanding, end of year
1,641,083

 
5.26

 
3,365,692

 
6.15

 
6,321,076

 
6.05

Options exercisable, end of year
1,605,789

 
5.27

 
3,217,146

 
6.22

 
5,278,243

 
6.31

Options expected to vest, end of year
4,443

 
4.66

 

 

 

 
Summary of Stock Options Outstanding and Exercisable
The following table summarizes information about stock options outstanding and exercisable as of December 31, 2014:
 
Options Outstanding
 
Options Exercisable
Range of
Exercise Price
Number of
Options
Outstanding
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
Number of
Options
Exercisable
 
Weighted
Average
Price
 
Weighted
Average
Remaining
Contractual
Life (Years)
$3.85 - $5.00
1,206,798

 
$
4.63

 
4.8
 
1,172,329

 
$
4.63

 
4.8
$5.01 - $7.00
210,663

 
5.58

 
4.0
 
209,838

 
5.58

 
4.0
$7.01 - $10.00
151,761

 
7.38

 
2.9
 
151,761

 
7.38

 
2.9
$10.01 - $16.23
71,861

 
10.29

 
2.4
 
71,861

 
10.29

 
2.4
$3.85 - $16.23
1,641,083

 
5.26

 
4.4
 
1,605,789

 
5.27

 
4.4
Reported Share-Based Compensation
The Company accounts for stock-based compensation using the fair-value method. Reported stock-based compensation was classified as follows for the years ended December 31 (in thousands):
 
2014
 
2013
 
2012
Cost of products sold and services delivered
$
204

 
$
175

 
$
172

Sales, general and administrative expenses
3,555

 
3,158

 
2,647

Research and development expenses
1,820

 
1,007

 
603

Total stock-based compensation
$
5,579

 
$
4,340

 
$
3,422