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Net Loss Per Share
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Net Loss Per Share
Net Loss Per Share
Basic loss per common share is determined by dividing loss attributable to common stockholders by the weighted-average number of common shares outstanding during the period, without consideration of common stock equivalents. Diluted loss per share is computed by dividing the 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. 4,533,794 stock options (common stock equivalents) were excluded from the calculation of diluted loss per share for the three and nine months ended September 30, 2017 because their inclusion would have been anti-dilutive. 3,856,652 stock options were excluded from the calculation of diluted loss per share for the three and nine months ended September 30, 2016 because their inclusion would have been anti-dilutive.
Basic and diluted 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,
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Net loss used for calculation of basic and diluted EPS
$
(47,043
)
 
$
(33,846
)
 
$
(125,353
)
 
$
(23,745
)
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted average shares outstanding, basic
36,779,305

 
34,766,440

 
35,847,449

 
34,629,330

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

 
—

 
—

 
—

Weighted average shares outstanding, diluted
36,779,305

 
34,766,440

 
35,847,449

 
34,629,330

 
 
 
 
 
 
 
 
Net loss per share, basic and diluted
$
(1.28
)
 
$
(0.97
)
 
$
(3.50
)
 
$
(0.69
)