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Net Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Computation of Basic and Diluted Net Loss per Share
The following table presents the calculation of basic and diluted net loss per share for the periods presented (in thousands, except per share data):
 
Year Ended
December 31,
2017
 
2016
 
2015
Net loss
$
(110,638
)
 
$
(103,799
)
 
$
(84,052
)
Weighted-average shares used to compute basic and diluted net loss per share
99,918

 
93,161

 
84,926

Net loss per share, basic and diluted
(1.11
)
 
(1.11
)
 
(0.99
)
Schedule of Anti-Dilutive Securities Excluded from the Diluted per Share Calculation
The anti-dilutive securities excluded from the shares used to calculate the diluted net loss per share are as follows (in thousands):
 
As of December 31,
2017
 
2016
 
2015
Shares subject to outstanding common stock options and employee stock purchase plan
6,343

 
8,556

 
10,844

Restricted stock units
5,827

 
6,936

 
6,417

 
12,170

 
15,492

 
17,260