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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 for the periods indicated (in thousands, except per share data):
 
Years Ended December 31,
 
2015
 
2014
 
2013
Numerator:
 
 
 
 
 
Net loss
$
(26,333
)
 
$
(20,814
)
 
$
(17,265
)
Denominator:
 
 
 
 
 
Weighted-average common shares outstanding
51,489

 
50,808

 
49,419

Basic and diluted net loss per common share
$
(0.51
)
 
$
(0.41
)
 
$
(0.35
)
Potentially dilutive shares, weighted-average
6,120

 
5,020

 
5,308


For all the three years presented, unvested restricted stock awards are included in the calculation of basic weighted-average shares because such shares are participating securities, however the impact was immaterial.
Potentially dilutive shares are excluded from the computation of diluted net loss per common share because their effect is antidilutive. These antidilutive shares were primarily from stock options, restricted stock units and performance restricted stock awards. We have incurred a net loss for all periods presented, hence, diluted net loss per common share is the same as basic net loss per common share since the effect of all potentially dilutive securities is antidilutive.