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Net Income (Loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2011
Net Income (Loss) Per Share  
Computation of Basic and Diluted Net Income (Loss) Per Share
  
  
Three Months Ended June 30,
    
Six Months Ended June 30,
  
   
2011
    
2010
    
2011
    
2010
  
                                 
Numerator:
                                
Net income (loss)
  
$
2,166
    
$
(117
)
  
$
26,894
    
$
(2,568
)
                                 
Denominator:
                                
Weighted average common stock outstanding (basic)
    
41,202,939
      
40,271,983
      
41,035,681
      
40,182,567
  
Common equivalent shares from options to purchase common stock and restricted common stock units
    
1,347,459
      
—
      
1,244,305
      
—
  
                             
                                 
Weighted average common stock outstanding (diluted)
    
42,550,398
      
40,271,983
      
42,279,986
      
40,182,567
  
                             
                                 
Basic net income (loss) per share
  
$
0.05
    
$
(0.00
)
  
$
0.66
    
$
(0.06
)
                             
Diluted net income (loss) per share
  
$
0.05
    
$
(0.00
)
  
$
0.64
    
$
(0.06
)
Securities Excluded from Computation of Diluted Earnings Per Share
   
Three Months Ended June 30,
    
Six Months Ended June 30,
  
   
2011
    
2010
    
2011
    
2010
  
                             
Stock options
    
1,163,365
      
5,051,340
      
1,240,235
      
4,829,268
  
Restricted stock units
    
42,640
      
829,041
      
249,118
      
747,810
  
Performance stock units
    
—
      
80,513
      
71,988
      
50,710
  
                                 
Total antidilutive awards
    
1,206,005
      
5,960,894
      
1,561,341
      
5,627,788