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Net Loss Per Share
 12 Months Ended
Dec. 31, 2019
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 amounts):
 
Year Ended December 31,
 
2019
 
2018
 
2017
Numerator:
 

 
 

 
 

Net loss
$
(132,993
)
 
$
(221,337
)
 
$
(254,237
)
Loss attributable to common stockholders—basic
(132,993
)
 
(221,337
)
 
(254,237
)
Loss attributable to common stockholders—diluted
$
(132,993
)
 
$
(221,337
)
 
$
(254,237
)
Denominator:
 

 
 

 
 

Weighted-average number of common shares used in loss per share— basic and diluted
46,026,217

 
45,356,263

 
43,804,660

Loss per share—basic and diluted
$
(2.89
)
 
$
(4.88
)
 
$
(5.80
)

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 years ended December 31, 2019, 2018, and 2017 all of the Company’s options to purchase common stock, warrants and stock units outstanding were assumed to be anti-dilutive as earnings attributable to common stockholders was in a loss position.
 
Year Ended December 31
 
2019
 
2018
 
2017
Options to purchase common stock
4,834,255

 
5,462,787

 
5,647,895

Warrants
—

 
120,532

 
605,415

Restricted stock units
614,273

 
227,088

 
146,451

Performance units
79,000

 
—

 
—