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Net Income (Loss) Per Share
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Net Income (Loss) Per Share
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. 4,621,008 stock options (common stock equivalents) were excluded from the calculation of diluted loss per share for the three and six months ended June 30, 2017, respectively, because their inclusion would have been anti-dilutive. 257,678 and 114,148 stock options were excluded from the calculation of diluted loss per share for the three and six months ended June 30, 2016, 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 June 30,
Six Months Ended June 30,
 
2017
 
2016
2017
 
2016
Numerator:
 
 
 
 
 
 
Net income (loss) used for calculation of basic and diluted EPS
$
(40,654
)
 
$
40,464

$
(78,310
)
 
$
10,101

 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
Weighted average shares outstanding, basic
35,784,804

 
34,616,197

35,373,799

 
34,560,021

Effect of dilutive securities:
 
 
 
 
 
 
Stock options and restricted stock units
—

 
1,401,214

—

 
1,406,966

Weighted average shares outstanding, diluted
35,784,804

 
36,017,411

35,373,799

 
35,966,987

 
 
 
 
 
 
 
Net income (loss) per share, basic
$
(1.14
)
 
$
1.17

$
(2.21
)
 
$
0.29

Net income (loss) per share, diluted
$
(1.14
)
 
$
1.12

$
(2.21
)
 
$
0.28