NET LOSS PER SHARE (Details) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive potential common shares (in thousands of shares)	6,481	5,194	5,015
Anti-dilutive common stock equivalents (in thousands of shares)	99	68	27
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive potential common shares (in thousands of shares)	5,987	5,008	4,308
Anti-dilutive common stock equivalents (in thousands of shares)	21	13	12
Non-Vested Restricted Stock and Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive potential common shares (in thousands of shares)	494	186	707
Anti-dilutive common stock equivalents (in thousands of shares)	78	55	15