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Net Loss Per Share (Tables)
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Weighted Average Number of Common Shares Outstanding
For purposes of this calculation, common stock subject to repurchase by the Company, options and warrants are considered to be common stock equivalents and are only included in the calculation of diluted earnings per share when their effect is dilutive (in thousands, except per share data):
 
 
Three Months Ended 
 March 31,
 
 
2015
 
2014
 
Numerator:
 
 
 
 
Net loss for basic earnings per share
$
(4,561
)
 
$
(6,673
)
 
Diluted net loss applicable to common stockholders
$
(4,561
)
 
$
(6,673
)
 
Denominator:
 
 
 
 
Weighted average common shares outstanding
99,849

 
97,668

 
Weighted average unvested common shares subject to repurchase
(829
)
 
(830
)
 
Weighted average common shares outstanding—basic
99,020

 
96,838

 
Effect of dilutive securities:
 
 
 
 
Conversion of preferred stock
—

 
—

 
Options
—

 
—

 
Warrants
—

 
—

 
Weighted average common shares outstanding—diluted
99,020

 
96,838

 
Net loss per share:
 
 
 
 
Basic
$
(0.05
)
 
$
(0.07
)
 
Diluted
$
(0.05
)
 
$
(0.07
)
 
Weighted-Average Anti-Dilutive Securities Not Included in Diluted Net Loss Per Share
The anti-dilutive securities not included in diluted net loss per share were as follows (in thousands):
 
 
Three Months Ended 
 March 31,
 
 
2015
 
2014
 
Options to purchase common stock
7,318

 
5,378

 
Unvested restricted share awards
829

 
830

 
Warrants to purchase common stock
11,544

 
10,844

 
Total
19,691

 
17,052