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Stock Option Plans and Share-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Options Roll Forward
A summary of option activity under the 2009 Plan for the nine months ended September 30, 2014 is presented below:
Options:
 
Number of Shares
 
Weighted-Average
 Exercise Price
 
 
(in thousands)
 
 
Outstanding at December 31, 2013
 
3,143

 
$15.82
Granted
 
397

 
$26.14
Exercised
 
(786
)
 
$14.44
Forfeited
 
(72
)
 
$18.96
Expired
 
(12
)
 
$19.88
Outstanding at September 30, 2014
 
2,670

 
$17.66
Vested and expected to vest at September 30, 2014
 
2,638

 
$17.60
Exercisable at September 30, 2014
 
1,612

 
$15.47
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
A summary of activity of both restricted stock and restricted stock units ("RSUs") for the nine months ended September 30, 2014 is presented below:
 
Restricted Stock
 
Restricted Stock Units
 
Number of
Shares
 
Weighted-Average
Grant Date
Fair Value Per
Share
 
Number of
Shares
 
Weighted-Average
Grant Date
Fair Value Per
Share
 
(in thousands)
 
 
 
(in thousands)
 
 
Non-vested, December 31, 2013
52

 
$18.43
 
362

 
$17.15
Granted
38

 
$25.16
 
127

 
$25.73
Vested
(54
)
 
$17.78
 
(118
)
 
$16.70
Forfeited

 

 
(18
)
 
$16.15
Non-vested, September 30, 2014
36

 
$26.47
 
353

 
$20.42

PSU % eligible vesting vs Total Shareholder Return - Second year
The following table shows the percent of PSUs granted in 2013 eligible for further time-based vesting based on our percentile placement:
Percentile Placement of Our Total Shareholder Return
% of PSUs Eligible for Time-
Based Vesting
Below the 35th percentile
—%
At least the 35th percentile, but below the 50th percentile
50%
At least the 50th percentile
100%
PSU % eligible vesting vs total Shareholder Return placement - First year
The following table shows the percent of PSUs granted in 2012 eligible for further time-based vesting based on our percentile placement:
Percentile Placement of Our Total Shareholder Return
% of PSUs Eligible for Time-
Based Vesting
Below the 35th percentile
—%
At least the 35th percentile, but below the 50th percentile
50%
At least the 50th percentile
100%
Schedule of Nonvested Performance-based Units Activity
A summary of activity of the PSUs for the nine months ended September 30, 2014 is presented below:
Performance-based Stock Units
Number of Shares
 
Weighted-Average
Grant Date
Fair Value Per
Share
 
(in thousands)
 
 
Non-vested, December 31, 2013
225

 
$13.32
   Granted
155

 
$14.36
   Vested
(74
)
 
$13.66
   Forfeited
(28
)
 
$3.07
Non-vested, September 30, 2014
278

 
$14.84
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
 The following table shows a summary of the share-based compensation expense included in the condensed consolidated statements of operations (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
Cost of revenues
$
441

 
$
325

 
$
973

 
$
955

Research and development
407

 
405

 
1,156

 
1,019

Selling, general and administrative
2,313

 
2,080

 
6,481

 
6,449

Total share-based compensation expenses
$
3,161

 
$
2,810

 
$
8,610

 
$
8,423