STOCK PLANS AND SHARE BASED COMPENSATION (Details)	6 Months Ended						6 Months Ended				6 Months Ended		1 Months Ended	6 Months Ended				6 Months Ended
	Jun. 30, 2011 years segments plans	Jun. 30, 2011 2007 Equity Incentive Plan [Member]	Jun. 30, 2011 2007 Equity Incentive Plan [Member] Incentive Stock Options [Member]	Jun. 30, 2011 2007 Equity Incentive Plan [Member] Nonstatutory Stock Options [Member]	Jun. 30, 2011 Directors Equity Compensation Program [Member]	Jun. 30, 2011 1997 Stock Option Plan [Member]	Jun. 30, 2011 1997 Stock Option Plan [Member] Incentive Stock Options [Member]	Jun. 30, 2011 1997 Stock Option Plan [Member] Nonstatutory Stock Options [Member]	Jun. 30, 2011 1997 Outside Directors Stock Option Plan [Member]	Sep. 30, 1997 1997 Outside Directors Stock Option Plan [Member]	Jun. 30, 2011 1997 Outside Directors Stock Option Plan [Member] Initial Grant [Member]	Jun. 30, 2011 1997 Outside Directors Stock Option Plan [Member] Annual Grant [Member]	Jul. 31, 1998 1998 Nonstatutory Stock Option Plan [Member]	Jun. 30, 2011 1998 Nonstatutory Stock Option Plan [Member]	Jun. 30, 2011 Stock Options [Member]	Jun. 30, 2011 1997 Employees Stock Purchase Plan [Member] years purchaseperiods	Jul. 31, 1998 1997 Employees Stock Purchase Plan [Member]	Jun. 30, 2011 Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans	5
Number of shares available for future issuance		6,855,024				0								0		712,448
Exercise price of stock options as percentage of fair market value on date of grant, minimum			100.00%	100.00%			100.00%	85.00%					85.00%
Awards vesting period (in months)		48			3 years									48 months	4 years			4 years
Awards expiration period, maximum (in years)		10 years							10 years					10 years
Award vesting rights											1/3rd of Initial Grants became exercisable one year after the date of grant and 1/36th of the Initial Grant will become exercisable monthly thereafter	exercisable in twelve equal monthly installments beginning in the 25th month after the date of grant
Multiplier for calculation of common stock options granted to directors on the first trading day of the month following commencement of service					8,000
Number of options granted to directors on the first trading day of July following commencement of service					24,000						30,000
Shares reserved for issuance										800,000			1,000,000				3,000,000
Maximum percentage of employee's compensation eligible for payroll deductions																	15.00%
Purchase price of stock options as percentage of the lower of the fair market value on the first day of each offering period or on the purchase date																85.00%
Option to purchase, number of shares												10,000
Award requisite service period												12 months
Number of purchase period in each offering period																1
Duration of each purchase period in each offering period																6 months
Number of shares purchased																2,287,552