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Net Loss Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Schedule of basic and diluted net loss per share
Basic and diluted net loss per share for the periods set forth below is calculated as follows (in thousands, except share and per share amounts):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
Numerator:
 

 
 

 
 

 
 

Net loss
$
(49,802
)
 
$
(57,843
)
 
$
(180,239
)
 
$
(183,220
)
 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 

 
 

Weighted-average number of common shares used in loss per share - basic and diluted
45,498,909

 
43,999,451

 
45,291,176

 
43,535,874

Loss per share - basic and diluted
$
(1.09
)
 
$
(1.31
)
 
$
(3.98
)
 
$
(4.21
)
Schedule of potentially dilutive securities excluded from the computation of diluted weighted-average shares outstanding
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, 2018 and 2017, respectively, all the Company’s options to purchase common stock, warrants, and restricted stock units outstanding were assumed to be anti-dilutive as earnings attributable to common stockholders was in a loss position.
 
 
Three and Nine Months Ended September 30,
 
 
2018
 
2017
Options to purchase common stock
 
5,759,140

 
6,233,398

Warrants
 
120,532

 
605,415

Restricted stock units
 
262,002

 
108,940