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Net Income (Loss) Per Share
9 Months Ended
Sep. 30, 2011
Net Income (Loss) Per Share [Abstract] 
Net Income (Loss) Per Share
 
5. Net Income (Loss) Per Share
 
We compute net income (loss) per share in accordance with FASB ASC Topic 260, "Earnings Per Share" (ASC Topic 260).  Under ASC Topic 260, basic earnings per share is calculated by dividing net income (loss) by the weighted average number of common shares outstanding during the period.  Diluted earnings per share is calculated by dividing net income by the weighted average number of common shares outstanding, assuming dilution, during the period. The diluted earnings per share calculation assumes (i) all stock options which are in the money are exercised at the beginning of the period and (ii) if applicable, unvested awards that are considered to be contingently issuable shares because they contain either a performance or market condition will be included in diluted earnings per share if dilutive and if their conditions have (a) been satisfied at the reporting date or (b) would have been satisfied if the reporting date was the end of the contingency period.
 
The following table sets forth the computation of basic and diluted net income (loss) per share for the three and nine months ended September 30, 2011 and 2010 (in thousands, except share and per share amounts):
 
  
  
Three Months Ended September 30,
    
Nine Months Ended September 30,
  
   
2011
    
2010
    
2011
    
2010
  
                                 
Numerator:
                                
Net income (loss)
  
$
5,361
    
$
1,182
    
$
32,255
    
$
(1,386
)
                                 
Denominator:
                                
Weighted average common stock outstanding (basic)
    
41,396,431
      
40,404,126
      
41,146,197
      
40,246,374
  
Common equivalent shares from options to purchase common stock, restricted common stock units and performance stock units
    
1,100,936
      
950,554
      
1,220,664
      
—
  
                                 
Weighted average common stock outstanding (diluted)
    
42,497,367
      
41,354,680
      
42,366,861
      
40,246,374
  
                                 
Basic net income (loss) per share
  
$
0.13
    
$
0.03
    
$
0.78
    
$
(0.03
)
                                 
Diluted net income (loss) per share
  
$
0.13
    
$
0.03
    
$
0.76
    
$
(0.03
)
 
 
The following is a summary of the weighted shares outstanding during the respective periods that have been excluded from the diluted net  income (loss) per share calculation because the effect would have been antidilutive:

   
Three Months Ended September 30,
    
Nine Months Ended September 30,
  
   
2011
    
2010
    
2011
    
2010
  
                             
Stock options
    
1,858,971
      
2,671,746
      
1,350,991
      
4,855,370
  
Restricted stock units
    
58,708
      
11,445
      
291,808
      
786,541
  
Performance stock units
    
1,472
      
—
      
75
      
29,887
  
                                 
Total antidilutive awards
    
1,919,151
      
2,683,191
      
1,642,874
      
5,671,798