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NET LOSS PER SHARE (Tables)
6 Months Ended
Jun. 30, 2012
NET LOSS PER SHARE [Abstract]  
Potentially Dilutive Securities not Included in the Diluted Loss per Share Calculation

 

    Six Months Ended June 30,  
    2012     2011  
             
Options to purchase common shares     2,661,334       4,093,921  
Warrants to purchase common shares     -       923,272  
Unvested restricted stock units     88,440       321,310  
Convertible preferred stock     107,172       107,172  
                 
Total potentially dilutive securities     2,856,946       5,445,675