NET LOSS PER SHARE (Details) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Antidilutive Securities Excluded from Computation of Net Loss Per Share [Line Items]
Anti-dilutive potential common shares (in thousands of shares)	6,734	6,344	6,836	5,163
Anti-dilutive common stock equivalents (in thousands of shares)	31	19	52	157
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Net Loss Per Share [Line Items]
Anti-dilutive potential common shares (in thousands of shares)	6,125	5,653	6,193	4,692
Anti-dilutive common stock equivalents (in thousands of shares)	0	6	0	68
Non-Vested Restricted Stock and Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Net Loss Per Share [Line Items]
Anti-dilutive potential common shares (in thousands of shares)	609	691	643	471
Anti-dilutive common stock equivalents (in thousands of shares)	31	13	52	89