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LOSS PER SHARE (Details 3)	3 Months Ended
LOSS PER SHARE (Details 3)	Mar. 31, 2015	Mar. 31, 2014
Restricted common stock
Effect of anti-dilutive securities
Anti-dilutive securities excluded from diluted weighted-average shares outstanding (in shares)	70,522	0
ESPP
Effect of anti-dilutive securities
Anti-dilutive securities excluded from diluted weighted-average shares outstanding (in shares)	12	3
Employee stock option
Effect of anti-dilutive securities
Anti-dilutive securities excluded from diluted weighted-average shares outstanding (in shares)	1,964,665	2,664,963

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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