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Loss per common share (Tables)
 3 Months Ended
Mar. 31, 2013
Loss per common share [Abstract]  
Basic and diluted loss per common share
Basic and diluted loss per common share were computed as follows:

 
 
Three Months Ended March 31,
 
 
 
(in thousands, except per share amounts)
 
 
 
2013
  
2012
 
Numerator:
 
  
 
   Net loss
 
$
(3,255
)
 
$
(5,649
)
 
        
Denominator:
        
   Basic-weighted average shares
  
17,924
   
17,727
 
   Effect of dilutive stock options
  
-
   
-
 
   Diluted-weighted average shares
  
17,924
   
17,727
 
 
        
Basic loss per common share
 
$
(0.18
)
 
$
(0.32
)
Diluted loss per common share
 
$
(0.18
)
 
$
(0.32
)