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Net Loss Per Share
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Net Loss Per Share
Net Loss Per Share
Net loss per share for the years ended December 31, 2014 and 2013 was as follows (in thousands):
 
 
 
Years Ended December 31,
 
 
2014
 
2013
 
2012
Numerator
 
 
 
 
 
 
Net loss attributable to common stockholders
 
(10,977
)
 
(27,935
)
 
(9,701
)
Denominator
 
 
 
 
 
 
Weighted average shares outstanding - basic
 
25,288

 
9,041

 
4,615

Dilutive effect of preferred stock, restricted stock units, options, warrants and convertible debt
 
—

 
—

 
—

Weighted average shares outstanding - diluted
 
25,288

 
9,041

 
4,615

The following common equivalent shares were excluded from the diluted net loss per share calculation as their inclusion would have been anti-dilutive (in thousands):
 
 
Years Ended December 31,
 
 
2014
 
2013
 
2012
Stock options
 
1,881

 
1,573

 
1,254

Restricted stock units
 
100

 
—

 
—

Redeemable convertible preferred stock
 
—

 
—

 
4,451

Convertible preferred stock
 
—

 
—

 
6,527

Common stock warrants
 
—

 
—

 
604

Preferred stock warrants
 
—

 
—

 
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