BASIC AND DILUTED NET INCOME (LOSS) PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
BASIC AND DILUTED NET INCOME (LOSS) PER SHARE
Difference between basic and diluted loss per share			$ 0
Numerator:
Net income (loss)	$ (7,251)	$ (7,745)	$ (21,879)	$ 13,147
Denominator:
Weighted average number of common shares outstanding	34,516,051	34,243,792	34,435,129	34,188,146
Effect of dilutive securities:
Stock options (in shares)				82,309
Dilutive potential common shares				82,309
Shares used in calculating diluted earnings per share	34,516,051	34,243,792	34,435,129	34,270,455
Antidilutive securities
Antidilutive common stock excluded from the calculation of dilutive shares	6,199,523	5,669,132	5,679,919	5,417,159
Options
Antidilutive securities
Antidilutive common stock excluded from the calculation of dilutive shares	6,195,437	5,665,046	5,675,833	5,413,073
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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