STOCK PLANS AND SHARE-BASED COMPENSATION (Stock-Based Compensation) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	$ 3,847,000	$ 1,668,000	$ 10,520,000	$ 6,617,000
Unrecognized Compensation Expense for Unvested Awards	22,700,000		22,700,000
Stock compensation expense		(700,000)
Stock Options [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Unrecognized Compensation Expense for Unvested Awards	4,500,000		4,500,000
Weighted Average Remaining Recognition Period (in years)			2.01
Stock compensation expense	1,100,000	1,000,000	3,000,000	3,100,000
Performance-based Awards [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Unrecognized Compensation Expense for Unvested Awards	700,000		700,000
Weighted Average Remaining Recognition Period (in years)			0.25
Stock compensation expense	400,000	(700,000)	1,600,000
Restricted Stock Units (RSUs) [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Unrecognized Compensation Expense for Unvested Awards	17,100,000		17,100,000
Weighted Average Remaining Recognition Period (in years)			2.67
Stock compensation expense	2,000,000	1,100,000	5,100,000	2,500,000
Employees Stock Purchase Plan [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Unrecognized Compensation Expense for Unvested Awards	400,000		400,000
Weighted Average Remaining Recognition Period (in years)			0.50
Stock compensation expense	300,000	300,000	800,000	900,000
Compensation Expense Amortized from Beginning Inventory [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock compensation expense				100,000
Cost of revenues [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	271,000	128,000	772,000	584,000
Research and development [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	1,467,000	564,000	4,154,000	2,354,000
Sales and marketing [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	940,000	449,000	2,433,000	1,659,000
General and administrative [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	$ 1,169,000	$ 527,000	$ 3,161,000	$ 2,020,000