BASIC AND DILUTED NET INCOME (LOSS) PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
BASIC AND DILUTED NET INCOME (LOSS) PER SHARE
Difference between basic and diluted loss per share			$ 0
Numerator:
Net income (loss)	$ (7,866)	$ (7,948)	$ (14,628)	$ 20,892
Denominator:
Weighted average number of common shares outstanding	34,434,271	34,183,702	34,393,998	34,160,018
Effect of dilutive securities:
Stock options (in shares)				104,410
Dilutive potential common shares				104,410
Shares used in calculating diluted earnings per share	34,434,271	34,183,702	34,393,998	34,264,428
Antidilutive securities
Antidilutive common stock excluded from the calculation of dilutive shares	5,647,604	4,460,713	5,539,962	4,440,713
Options
Antidilutive securities
Antidilutive common stock excluded from the calculation of dilutive shares	5,643,518	4,456,627	5,535,876	4,436,627
Warrants
Antidilutive securities
Antidilutive common stock excluded from the calculation of dilutive shares	4,086	4,086	4,086	4,086

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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