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Net Income (Loss) Per Share
 9 Months Ended
Sep. 30, 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. 1,458,168 and 1,916,156 stock options (common stock equivalents) were excluded from the calculation of diluted income (loss) per share for the three months ended September 30, 2016 and 2015, respectively, because their inclusion would have been anti-dilutive. 1,424,980 and 911,304 stock options were excluded from the calculation of diluted income per share for the nine months ended September 30, 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 September 30,
  
Nine Months Ended September 30,
 
  
2016
  
2015
  
2016
  
2015
 
Numerator:
            
Net income (loss) used for calculation of basic and diluted EPS
 
$
(33,846
)
 
$
(15,442
)
 
$
(23,745
)
 
$
8,311
 
                 
Denominator:
                
Weighted average shares outstanding, basic
  
34,766,440
   
33,339,163
   
34,629,330
   
30,952,458
 
Effect of dilutive securities:
                
Stock options and restricted stock units
  
-
   
-
   
-
   
2,007,775
 
Weighted average shares outstanding, diluted
  
34,766,440
   
33,339,163
   
34,629,330
   
32,960,233
 
                 
Net income (loss) per share, basic
 
$
($0.97
)
 
$
($0.46
)
 
$
($0.69
)
 
$
$0.27
 
Net income (loss) per share, diluted
 
$
($0.97
)
 
$
($0.46
)
 
$
($0.69
)
 
$
$0.25