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Loss per common share (Tables)
 12 Months Ended
Dec. 31, 2012
Loss per common share [Abstract]  
Basic and Diluted Loss per Common Share
Basic and diluted loss per common share was computed as follows:

 
 
(in thousands, except per share amounts)
 
 
 
2012
  
2011
  
2010
 
Numerator:
 
  
  
 
   Net loss
 
$
(15,056
)
 
$
(36,670
)
 
$
(11,930
)
 
            
Denominator:
            
   Basic – weighted-average shares
  
17,852
   
17,589
   
17,275
 
   Effect of dilutive stock options
  
-
   
-
   
-
 
   Diluted – weighted-average shares
  
17,852
   
17,589
   
17,275
 
 
            
Basic loss per common share
 
$
(0.84
)
 
$
(2.08
)
 
$
(0.69
)
Diluted loss per common share
 
$
(0.84
)
 
$
(2.08
)
 
$
(0.69
)