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Net Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2016
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,
2016
 
2015
 
2014
Net loss
$
(103,799
)
 
$
(84,052
)
 
$
(67,415
)
Less: Accretion of redeemable convertible preferred stock
—

 
—

 
(18
)
Net loss attributable to common stockholders
$
(103,799
)
 
$
(84,052
)
 
$
(67,433
)
Basic shares:
 

 
 

 
 

Weighted-average common shares outstanding
93,307

 
85,238

 
54,383

Less: Weighted-average common shares subject to repurchase
(146
)
 
(312
)
 
(812
)
Weighted-average common shares used to compute basic net loss per share
93,161

 
84,926

 
53,571

Diluted shares:
 

 
 

 
 

Weighted-average common shares used to compute diluted net loss per share
93,161

 
84,926

 
53,571

Net loss per share attributable to common stockholders:
 

 
 

 
 

Basic and diluted
$
(1.11
)
 
$
(0.99
)
 
$
(1.26
)
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,
2016
 
2015
 
2014
Shares subject to outstanding common stock options and employee stock purchase plan
8,556

 
10,844

 
12,178

Restricted stock units
6,936

 
6,417

 
3,064

 
15,492

 
17,260

 
15,242