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Loss Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Reconciliation of Basic Loss Per Common Share to Diluted Loss Per Common Share
A reconciliation of basic loss per common share to diluted loss per common share is as follows (in thousands, except per share data):
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
 
2017
 
2016
 
2017
 
2016
Net loss—basic and diluted
 
$
(6,182
)
 
$
(5,307
)
 
$
(10,984
)
 
$
(9,574
)
 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding—basic
 
24,155

 
23,268

 
23,916

 
23,078

Dilutive effect of common stock equivalents
 
—

 
—

 
—

 
—

Weighted average common shares outstanding—diluted
 
24,155

 
23,268

 
23,916

 
23,078

 
 
 
 
 
 
 
 
 
Net loss per common share—basic and diluted
 
$
(0.26
)
 
$
(0.23
)
 
$
(0.46
)
 
$
(0.41
)