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Net Income (Loss) Per Share
 3 Months Ended
Mar. 31, 2016
Net Income (Loss) Per Share [Abstract]  
Net Income (Loss) Per Share
7. Net Income (Loss) Per Share

Basic income (loss) per common share is determined by dividing income (loss) attributable to common stockholders by the weighted-average number of common shares outstanding during the period, without consideration of common stock equivalents. Diluted income (loss) per share is computed by dividing the income (loss) attributable to common stockholders by the weighted-average number of common stock equivalents outstanding for the period. The treasury stock method is used to determine the dilutive effect of the Company's stock option grants. 1,415,558 and 2,719,339 stock options (common stock equivalents) were excluded from the calculation of diluted income (loss) per share for the three months ended March 31, 2016 and 2015, respectively, because their inclusion would have been anti-dilutive.

Basic and diluted income (loss) per common share is computed as follows (in thousands except share and per share data):

  
Three Months Ended March 31,
 
  
2016
  
2015
 
Numerator:
      
Net income (loss) used for calculation of basic and diluted EPS
 
$
(30,363
)
 
$
45,129
 
         
Denominator:
        
Weighted average shares outstanding, basic
  
34,503,845
   
29,415,768
 
Effect of dilutive securities:
        
Stock options and restricted stock units
  
-
   
2,268,406
 
Weighted average shares outstanding, diluted
  
34,503,845
   
31,684,174
 
         
Net income (loss) per share, basic
 
$
(0.88
)
 
$
1.53
 
Net income (loss) per share, diluted
 
$
(0.88
)
 
$
1.42