NET LOSS PER SHARE (Details) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Antidilutive Securities Excluded from Computation of Net Loss Per Share [Line Items]
Anti-dilutive potential common shares (in thousands of shares)	7,615	4,713	6,933	3,957
Anti-dilutive common stock equivalents (in thousands of shares)	20	202	39	350
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Net Loss Per Share [Line Items]
Anti-dilutive potential common shares (in thousands of shares)	6,854	3,903	6,249	3,357
Anti-dilutive common stock equivalents (in thousands of shares)	0	166	0	247
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)	761	810	684	600
Anti-dilutive common stock equivalents (in thousands of shares)	20	36	39	103