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Net Loss Per Share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Schedule of Historical Basic and Diluted Net Loss Per Share
The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share data):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2016
 
2015
 
2016
 
2015
Numerator:
 
 
 
 
 
 
 
Net loss
$
(6,725
)
 
$
(9,310
)
 
$
(14,134
)
 
$
(17,475
)
Denominator:
 
 
 
 
 
 
 
Weighted-average common shares outstanding
77,144

 
75,126

 
76,813

 
74,759

Less: Weighted-average unvested common shares subject to repurchase or forfeiture
—

 
(115
)
 
—

 
(231
)
Weighted-average shares used to compute net loss per share, basic and diluted
77,144

 
75,011

 
76,813

 
74,528

Net loss per share, basic and diluted
$
(0.09
)
 
$
(0.12
)
 
$
(0.18
)
 
$
(0.23
)
Summary of Potentially Dilutive Securities That Are Not Included in Diluted Per Share
Potentially dilutive securities that are not included in the diluted per share calculations because they would be anti-dilutive were as follows:
 
As of June 30,
 
2016
 
2015
Shares subject to outstanding common stock options
7,934,530

 
7,521,078

Unvested restricted common stock
5,726,833

 
5,335,381

Common stock subject to repurchase
—

 
41,344

Purchase rights from the ESPP
206,986

 
—

 
13,868,349

 
12,897,803