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Net Loss Per Share
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Net Loss Per Share
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):
 
Year Ended December 31,
 
2015
 
2014
 
2013
Numerator:
 
 
 
 
 
Net loss
$
(34,853
)
 
$
(56,153
)
 
$
(75,371
)
Denominator:
 
 
 
 
 
Weighted-average common shares outstanding
75,365

 
71,251

 
67,858

Less: Weighted-average unvested common shares subject to repurchase or forfeiture
148

 
500

 
477

Weighted-average shares used to compute net loss per share, basic and diluted
75,217

 
70,751

 
67,381

Net loss per share, basic and diluted
$
(0.46
)
 
$
(0.79
)
 
$
(1.12
)


Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows:
 
Year Ended December 31,
 
2015
 
2014
 
2013
Shares subject to outstanding common stock options
6,976,957

 
7,329,575

 
9,480,138

Unvested restricted common stock
4,498,292

 
4,043,912

 
4,796,112

Common stock subject to repurchase
—

 
313,412

 
635,928

Purchase rights from employee stock purchase plans
8,268

 
—

 
—

 
11,483,517

 
11,686,899

 
14,912,178