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Net Loss Per Share
 12 Months Ended
Dec. 31, 2013
Net Loss Per Share [Abstract]  
Net Loss Per Share
15.   Net Loss Per Share
 
 
Basic net loss per common share for the years ended December 31, 2013, 2012 and 2011 was computed by dividing the net loss by the weighted average number of shares of common stock outstanding during the year. 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 during the year.
 
Potential common stock equivalents of approximately 0.8 million, 4.7 million and 5.4 million outstanding stock warrants, 11,000, 52,000 and 55,000 shares issuable upon conversion of preferred stock and 1.6 million, 1.7 million and 19,000 stock options are excluded from the diluted earnings per share calculation for the years ended December 31, 2013, 2012 and 2011, respectively, due to their anti-dilutive effect.
 
(in thousands, except per share amounts)
   Years ended December 31,  
   
2013
    
2012
    
2011
  
BASIC AND DILUTED
                  
Weighted average number of common shares outstanding
     35,266       33,003       26,784  
                         
Net loss
   $ (13,080 )   $ (9,287 )   $ (17,145 )
                         
Net loss per shares basic and diluted
   $ (0.37 )   $ (0.28 )   $ (0.64 )