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Net Loss Per Share
 12 Months Ended
Dec. 31, 2012
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, 2012, 2011 and 2010 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 4.7 million, 5.4 million and 5.1 million outstanding stock warrants, 52,000, 55,000 and 100,000 shares issuable upon conversion of preferred stock, 1.7 million, 19,000 and 20,000 stock options and 0, 0 and 0.2 million shares issuable upon conversion of notes are excluded from the diluted earnings per share calculation for the years ended December 31, 2012, 2011 and 2010, respectively, due to their anti-dilutive effect.
 
(in thousands, except per share amounts)
     Year ended December 31,  
   
2012
    
2011
    
2010_
  
BASIC AND DILUTED
                  
Weighted average number of
                  
common shares outstanding
     33,003       26,784       18,293  
                         
Net loss
   $ (9,287 )   $ (17,145 )   $ (31,626 )
                         
Net loss per shares basic and diluted
   $ (0.28 )   $ (0.64 )   $ (1.73