NET INCOME (LOSS) PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Numerator [Abstract]
Net income (loss)	$ (6,717)	$ 579
Denominator [Abstract]
Weighted average common shares - basic (in shares)	19,931	14,547
Dilutive effect of employee equity incentive plans (in shares)	0	483
Dilutive effect of warrants (in shares)	0	34
Weighted average common shares - diluted (in shares)	19,931	15,064
Net income (loss) per share [Abstract]
Basic (in dollars per share)	$ (0.34)	$ 0.04
Diluted (in dollars per share)	$ (0.34)	$ 0.04
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive securities (in shares)	1,107	280
Options and restricted stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive securities (in shares)	1,107	260
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive securities (in shares)	0	20