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Net Loss Per Common Share
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Net Loss Per Common Share
Net Loss Per Common Share
The following table sets forth the computation of basic and diluted net loss per common share for the periods indicated (in thousands, except per share data):
 
 
Years Ended December 31,
 
 
2018
 
2017
 
2016
Numerator:
 
 
 
 
 
 
Net loss
 
$
(19,298
)
 
$
(83,032
)
 
$
(27,402
)
Denominator:
 
 
 
 
 
 
Weighted-average common shares outstanding
 
52,609

 
50,155

 
48,730

Basic and diluted net loss per common share
 
$
(0.37
)
 
$
(1.66
)
 
$
(0.56
)
Potentially dilutive shares, weighted-average
 
5,833

 
3,446

 
5,890


For the year ended December 31, 2018 and 2017, 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. There were no unvested restricted stock awards for the year ended December 31, 2016.
Potentially dilutive shares have been excluded from the computation of diluted net loss per common share when their effect is antidilutive. These antidilutive shares were primarily from stock options, restricted stock units and performance restricted stock units. For each of the periods presented where the Company reported a net loss, the effect of all potentially dilutive securities would be antidilutive, and as a result diluted net loss per common share is the same as basic net loss per common share.