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Net Loss per Share Attributable to Common Stockholders (Tables)
 9 Months Ended
Sep. 30, 2016
Earnings Per Share [Abstract]  
Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share Attributable to Common Stockholders
The following table sets forth the computation of the Company’s basic and diluted net loss per share attributable to common stockholders for the three and nine months ended September 30, 2016 and 2015 (in thousands, except for share and per share amounts):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2016
 
2015
 
2016
 
2015
Net loss attributable to common stockholders, basic
$
(17,978
)
 
$
(19,175
)
 
$
(62,468
)
 
$
(51,382
)
Net loss attributable to common stockholders, diluted
$
(17,978
)
 
$
(19,175
)
 
$
(62,468
)
 
$
(51,382
)
Net loss per share attributable to common stockholders
 
 
 
 
 
 
 
Basic
$
(0.64
)
 
$
(0.81
)
 
$
(2.22
)
 
$
(2.17
)
Diluted
$
(0.64
)
 
$
(0.81
)
 
$
(2.22
)
 
$
(2.17
)
Weighted-average shares used in computing net loss per share attributable to common stockholders:
 
 
 
 
 
 
 
Basic
28,160,458

 
23,755,199

 
28,085,541

 
23,625,869

Diluted
28,160,458

 
23,755,199

 
28,085,541

 
23,625,869
Summary of Common Stock Equivalents Excluded from Computation of Diluted Net Income (Loss) Per Share
The following common stock equivalents were excluded from the computation of diluted net loss per share for the periods presented as their inclusion would have been antidilutive: 
 
As of September 30,
 
2016
 
2015
Stock options
2,843,580

 
2,374,055

Common stock warrants
61,595

 
198,662

Unvested restricted stock awards
327,899

 
308,193

Shares expected to be purchased on December 31 under the 2014 ESPP
11,643

 
7,945