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Net Loss Per Share
 9 Months Ended
Sep. 30, 2014
Earnings Per Share [Abstract]  
Net Loss Per Share
Net Loss Per Share
For fiscal years preceding 2013, basic and diluted net (loss) income per common share were presented in conformity with the two-class method required for participating securities.
For the three months and the nine months ended September 30, 2014 and 2013, the two-class method is not applicable due to the net losses, which must be attributed entirely to the common shareholders. Additionally, as of September 30, 2014 and December 31, 2013, there were 4,433 and 26,463 shares of participating securities, respectively, consisting of repurchasable shares issued from early exercise of options and unvested restricted shares; thus, the future effect of participating securities would generally be immaterial, even in years with net income.
The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share amounts):
 
Three months ended September 30,
 
Nine months ended September 30,
 
2014
 
2013
 
2014
 
2013
Numerator:
 
 
 
 
 
 
 
Net loss
$
(7,891
)
 
$
(3,102
)
 
$
(21,288
)
 
$
(8,623
)
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted-average shares used to compute net loss per common share - basic and diluted
25,432

 
24,747

 
25,243

 
24,530

 
 
 
 
 
 
 
 
Net loss per share
 
 
 
 
 
 
 
   Basic and diluted
$
(0.31
)
 
$
(0.13
)
 
$
(0.84
)
 
$
(0.35
)

The following securities were not included in the calculation of diluted shares outstanding as the effect would have been anti-dilutive:
 
Three months ended September 30,
 
Nine months ended September 30,
(in thousands)
2014
 
2013
 
2014
 
2013
Options to purchase common stock, including ESPP
3,771

 
3,347

 
3,589

 
3,324

Common stock subject to repurchase
4

 
20

 
6

 
28

Warrants to purchase common stock
44

 
44

 
44

 
44

Restricted stock units
1,110

 
714

 
954

 
579

Restricted stock awards
—

 
12

 
—

 
12