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NET LOSS PER SHARE (Tables)
3 Months Ended
Mar. 31, 2013
NET LOSS PER SHARE [Abstract]  
Potentially Dilutive Securities not Included in the Diluted Loss per Share Calculation

 

    Three Months Ended March 31,  
    2013     2012  
             
Options to purchase common shares     1,172,166       2,824,001  
Unvested restricted stock units     38,230       224,001  
Convertible preferred stock     107,172       107,172  
                 
Total potentially dilutive securities     1,317,568       3,155,174