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Net Loss Per Share
 9 Months Ended
Sep. 30, 2016
Earnings Per Share [Abstract]  
Net Loss Per Share
Net Loss Per Share
 
Basic and diluted net loss per share is calculated as follows (in thousands, except share and per share numbers):
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2016
 
2015
 
2016
 
2015
Numerator:
 

 
 

 
 
 
 
Net loss
$
(46,186
)
 
$
(28,264
)
 
$
(130,084
)
 
$
(68,286
)
Loss attributable to common stockholders - basic and diluted
$
(46,186
)
 
$
(28,264
)
 
$
(130,084
)
 
$
(68,286
)
 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 

 
 

Weighted-average number of common shares used in loss per share - basic and diluted
43,092,921

 
41,331,612

 
43,049,734

 
38,525,827

Loss per share - basic and diluted
$
(1.07
)
 
$
(0.68
)
 
$
(3.02
)
 
$
(1.77
)

 
The following potentially dilutive securities, prior to the use of the treasury stock method, have been excluded from the computation of diluted weighted-average shares outstanding, as they would be anti-dilutive. For the three and nine months ended September 30, 2016 and 2015, all of the Company’s options to purchase common stock, warrants, restricted stock units and performance units outstanding were assumed to be anti-dilutive as earnings attributable to common stockholders was in a loss position.
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2016
 
2015
 
2016
 
2015
Options to purchase common stock
6,148,974

 
4,115,204

 
5,633,972

 
3,748,900

Warrants
631,588

 
703,127

 
631,588

 
886,320

Restricted stock units
—

 
—

 
37,700

 
—

Performance units
—

 
—

 
—

 
—