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




Nine Months Ended September 30,


2012

2011







Options to purchase common shares

1,658,166


4,028,590
Unvested restricted stock units

83,684


291,221
Convertible preferred stock

107,172


107,172









Total potentially dilutive securities

1,849,022


4,426,983