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Net Loss Per Share
 6 Months Ended
Jun. 30, 2013
Net Loss Per Share [Abstract]  
Net Loss Per Share
8.     Net Loss Per Share
 
Basic net loss per common share for the three and six months ended June 30, 2013 and 2012 was computed by dividing the net loss for the relevant period by the weighted average number of shares of common stock outstanding. Diluted loss per common share is computed by dividing net loss by the weighted average number of shares of common stock and common stock equivalents outstanding.
 
Potential common stock equivalents of approximately 332,000 and 103,000 outstanding stock options, 2.5 million and 3.4 million outstanding stock warrants under the treasury stock method and 11,000 and 52,000 shares issuable upon conversion of preferred stock are excluded from the diluted earnings per share calculation for the six months ended June 30, 2013 and 2012, respectively, due to their anti-dilutive effect.
 
(in thousands, except per share amounts)  
Three months ended
June 30,
  
    2013     2012  
BASIC AND DILUTED
            
             
Weighted average number of common shares outstanding
     34,135       32,969  
                 
Number of shares for computation of net loss per share
     34,135       32,969  
                 
Net loss
   $
(3,120
 )   $ (3,427 )
                 
Net loss per share - basic and diluted
   $ (0.09 )   $ (0.10 )
                   
(in thousands, except per share amounts)  
Six months ended
June 30,
  
    2013     2012  
             
BASIC AND DILUTED
            
Weighted average number of common shares outstanding
     33,825       32,889  
                 
Number of shares for computation of net loss per share
     33,825       32,889  
                 
Net loss
   $
(6,690
 )   $ (5,015 )
                 
Net loss per share - basic and diluted
   $ (0.20 )   $ (0.15 )