NET LOSS PER COMMON SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss)	$ 2,384	$ (4,156)	$ (9,001)	$ (25,700)
Adjusted net income (loss)	2,384	(4,156)	(9,001)	(25,700)
Shares used in computing basic net income (loss) per common share	73,413	71,600	72,955	71,227
Shares used in computing diluted net income (loss) per common share	76,315	71,600	72,955	71,227
Basic net income (loss) per common share	$ 0.03	$ (0.06)	$ (0.12)	$ (0.36)
Diluted net income (loss) per common share	$ 0.03	$ (0.06)	$ (0.12)	$ (0.36)
Employee stock options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive securities	1,170
Restricted stock and restricted stock units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive securities	$ 1,732