NET LOSS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Earnings Per Share [Line Items]
Net loss	$ (19,319)	$ (17,950)	$ (33,403)
Weighted Average Number of Shares Outstanding Reconciliation
Weighted-average common shares outstanding - basic	58,538,000	55,299,000	50,073,000
Weighted-average common shares outstanding - diluted	58,538,000	55,299,000	50,073,000
Basic and diluted (in usd per share)	$ (0.33)	$ (0.32)	$ (0.67)
Stock Options and Restricted Stock Units
Schedule of Earnings Per Share [Line Items]
Antidilutive securities included in computation of earnings per share, amount (in shares)	0	0	0
Weighted Average Number of Shares Outstanding Reconciliation
Total number of options to purchase common stock and restricted stock units, outstanding (in shares)	7,600,000	6,700,000	6,600,000
Stock Options and Restricted Stock Units
Weighted Average Number of Shares Outstanding Reconciliation
Effect of diluted potential common shares from stock options and restricted stock units	0	0	0