Net Loss Per Share
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Net Loss Per Share
Net Loss Per Share
We compute basic net loss per share by dividing net loss by the weighted-average number of common shares outstanding for the period. We compute diluted net loss per share giving effect to all potential dilutive common stock, including awards granted under our equity compensation plans and warrants to acquire common stock.
The following table sets forth the computation of basic and diluted net loss:
 
For the Three Months Ended March 31,
 
2015
 
2014
Net loss
$
(9,158
)
 
$
(4,295
)
Denominator (basic and diluted):
 
 
 
Weighted average common shares outstanding
94,033,035

 
91,903,036

Net loss per share:
 
 
 
Basic and diluted
$
(0.10
)
 
$
(0.05
)

For the three-month periods ended March 31, 2015 and 2014, potentially dilutive securities were not included in the calculation of diluted net loss per share, as their impact would be anti-dilutive. The following weighted-average number of outstanding employee stock options, restricted stock units and restricted stock awards, warrants to purchase common stock, and shares purchased under our ESPP were excluded from the computation of diluted net loss per share:  
 
For the Three Months Ended March 31,
 
2015
 
2014
Stock options outstanding
2,898,461

 
5,131,673

Restricted stock units and restricted stock awards
145,676

 
217,010

Common equivalent shares from stock warrants
2,219,671

 
2,378,641

Shares purchased under ESPP
—

 
25,105

 
5,263,808

 
7,752,429