NET (LOSS) INCOME PER COMMON SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Numerator:
Net Income (Loss) Available to Common Stockholders, Diluted	$ (17,859)	$ (9,789)	$ 1,573	$ (13,422)
Denominator:
Shares used in computing basic net income (loss) per common share	70,403	69,719	70,181	70,790
Add effect of dilutive securities:
Employee stock compensation plans (in shares)	0	0	103	0
Common stock subject to repurchase (in shares)	0	0	326	0
Shares Used In Computing Diluted Net (Loss) Income Per Common Share	70,403	69,719	70,610	70,790
Basic Net (Loss) Income Per Common Share	$ (0.25)	$ (0.14)	$ 0.02	$ (0.19)
Diluted Net (Loss) Income Per Common Share	$ (0.25)	$ (0.14)	$ 0.02	$ (0.19)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	28,461	11,177	17,269	11,177
Employee Stock Compensation Plans [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	6,435	6,214	6,331	6,214
Restricted Stock Subject to Repurchase [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	4,041	1,794	3,724	1,794
Convertible Notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	17,985	3,169	7,214	3,169