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STOCK BASED COMPENSATION (Tables)
 9 Months Ended
Sep. 30, 2013
STOCK BASED COMPENSATION [Abstract]  
Components of Stock-Based Compensation Expense
The following table sets forth the components of the Company’s stock-based compensation expense for the three and nine month periods ended September 30, 2013 and 2012 (in thousands):

   
Three months ended
September 30,
  
Nine months ended
September 30,
 
   
2013
  
2012
  
2013
  
2012
 
Stock options and employee stock purchase plan
 $1,326  $1,590  $5,156  $4,762 
Restricted stock awards
  104   278   518   287 
Total stock-based compensation expense
 $1,430  $1,868  $5,674  $5,049 
                  
Weighted-Average Assumptions Used in Estimating Grant Date Fair Value of Stock Options Granted
The weighted-average assumptions used in estimating the grant date fair value of the stock options granted during the three and nine months ended September 30, 2013 and 2012, along with the weighted-average grant date fair values, were as follows:

 
   
Three months ended
September 30,
  
Nine months ended
September 30,
 
   
2013
  
2012
  
2013
  
2012
 
Expected volatility
  N/A   71%  59%  84%
Expected life (in years)
  N/A   4.0   4.0   4.0 
Risk-free interest rate
  N/A   0.7%  0.74%  0.74%
Dividend yield
  N/A   —%  —%  —%
Fair value per stock option
  N/A  $7.08  $6.77  $7.92 
Forfeiture rate
  N/A   8%  8%  8%
                  
Share Based Compensation Plan Activity
The table below sets forth a summary of activity within the Company’s stock option plan for the nine months ended September 30, 2013: 
   
Number of
Options 
(in thousands)
   
Weighted Average Exercise Price
   
Weighted Average Remaining Contractual Term (Years)
   
Aggregate
Intrinsic Value
 
Outstanding at December 31, 2012
   
9,727
   
$
4.22
     
2.55
   
$
88,918,000
 
Granted
   
276
     
15.02
                 
Exercised
   
(415
)
   
4.48
                 
Forfeited
   
(29
)
   
11.26
                 
Outstanding at September 30, 2013
   
9,559
   
$ 
4.50
     
1.88
   
$
145,081,000
 
Exercisable at September 30, 2013
   
7,646
   
$ 
2.94
     
1.19
   
$
128,027,000
 
Non Vested Restricted Stock Activity
The following is a summary of non-vested restricted stock activity:
                 
   
Number of Shares
 
Weighted Average
   
(in thousands)
 
Grant Date Fair Value
Non-vested at December 31, 2012
   
17
   
 $
14.63
 
Granted
   
32
   
   $
15.36
 
Forfeited
   
—
     
—
 
Vested
   
(33)
   
   $
14.98
 
Non-vested at September 30, 2013
   
16
   
  $
15.36