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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Fair value of options granted to employees and members of our board of directors
The following table summarizes the weighted-average assumptions used to compute the fair value of options granted to employees and members of our board of directors:
 
For the Three Months Ended September 30,
 
For the Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
Risk-free interest rate
1.7%
 
1.5%
 
1.6%
 
1.4%
Expected life of options — years
4.78
 
4.73
 
4.72
 
4.72
Expected stock price volatility
33%
 
47%
 
33%
 
48%
Expected dividend yield
0%
 
0%
 
0%
 
0%
Stock options activity under share-based payment plans
The following table summarizes stock option activity under our share-based plans for the nine months ended September 30, 2014 (options in thousands):
 
Options
 
Weighted-
Average
Exercise
Price
 
Weighted-Average
Remaining
Contractual Term
(Years)
 
Aggregate
Intrinsic
Value
Outstanding as of December 31, 2013
264,239

 
$
2.42

 
 
 
 
Granted
59,534

 
$
3.39

 
 
 
 
Exercised
(33,878
)
 
$
1.67

 
 
 
 
Forfeited, cancelled or expired
(8,297
)
 
$
4.22

 
 
 
 
Outstanding as of September 30, 2014
281,598

 
$
2.67

 
7.24
 
$
269,957

Exercisable as of September 30, 2014
134,344

 
$
2.21

 
5.52
 
$
204,055
Summary of restricted stock unit activity
The following table summarizes the nonvested restricted stock unit activity under our share-based plans for the nine months ended September 30, 2014 (shares in thousands):
 
Shares
 
Grant Date Fair Value
Nonvested as of December 31, 2013
6,984

 
$
3.58

Granted
5,883

 
$
3.39

Vested restricted stock units
(1,105
)
 
$
3.61

Forfeited
(224
)
 
$
3.56

Nonvested as of September 30, 2014
11,538

 
$
3.48