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Net Loss Per Share
 6 Months Ended
Jun. 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
June 30,
 
Six Months Ended
June 30,
 
2016
 
2015
 
2016
 
2015
Numerator:
 

 
 

 
 
 
 
Net loss
$
(43,435
)
 
$
(22,965
)
 
$
(83,898
)
 
$
(40,022
)
Loss attributable to common stockholders - basic and diluted
$
(43,435
)
 
$
(22,965
)
 
$
(83,898
)
 
$
(40,022
)
 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 

 
 

Weighted-average number of common shares used in loss per share - basic and diluted
43,042,883

 
37,895,651

 
43,027,903

 
37,089,642

Loss per share - basic and diluted
$
(1.01
)
 
$
(0.61
)
 
$
(1.95
)
 
$
(1.08
)

 
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 six months ended June 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
June 30,
 
Six Months Ended
June 30,
 
2016
 
2015
 
2016
 
2015
Options to purchase common stock
5,773,589

 
3,747,303

 
5,373,641

 
3,562,712

Warrants
631,588

 
846,720

 
631,588

 
979,434

Restricted stock units
55,929

 
—

 
27,964

 
—

Performance units
—

 
—

 
—

 
—