STOCKHOLDERS' EQUITY (Tables)

3 Months Ended

Mar. 31, 2012

STOCKHOLDERS' EQUITY.

Summary of the distribution of stock-based compensation expense

	Three Months Ended
	March 31,			March 31,
	2012			2011
	(in thousands)
Cost of revenue	$	2,255		$	2,293
Research and development	6,763			5,982
Selling, general and administrative	10,309			10,614
Total stock-based compensation expense, before income taxes	19,327			18,889
Tax benefit	(2,790		)	(2,644		)
Total stock-based compensation expense, net of income taxes	$	16,537		$	16,245

Activity under the entity's 2005 Stock Plan

			Outstanding Options			Weighted-
					Exercise	Average
	Available		Number of		Price	Exercise Price
	for Grant		Options		per Share	per Share
	(in thousands, except per share data)
Balances, December 31, 2011	16,523		8,217		$1.68-$10.01	$	4.26
Restricted stock units issued	(210	)	—		—	—
Adjustment for restricted stock units issued	(128	)	—		—	—
Performance-based restricted stock units issued	(200	)	—		—	—
Adjustment for perfomance-based restricted stock units issued	(122	)	—		—	—
Restricted stock units cancelled	405		—		—	—
Adjustment for restricted stock units cancelled	301		—		—	—
Performance-based restricted stock units cancelled	75		—		—	—
Adjustment for perfomance-based restricted stock units cancelled	46		—		—	—
Options cancelled/expired/forfeited	78		(78	)	$2.11-$8.89	4.36
Options exercised	—		(495	)	$1.80-$8.89	4.58
Balances, March 31, 2012	16,768		7,644		$1.68-$10.01	$	4.24

Activity related to restricted stock units

			Weighted-Average
	Number of		Fair Value
	Units		Per Share
	(in thousands, except per share data)
Balance, December 31, 2011	23,187		$	3.18
Restricted stock units issued	210		10.20
Restricted stock units vested	(1,225	)	10.27
Restricted stock units cancelled	(405	)	8.11
Performance-based restricted stock units issued	200		10.73
Performance-based restricted stock units cancelled	(75	)	14.00
Balance, March 31, 2012	21,892		$	2.79

Assumptions used to estimate the fair value of the Company's ESPP shares

	Three Months Ended
	March 31,		March 31,
	2012		2011
Risk-free interest rate	0.15	%	0.17	%
Expected life (years)	0.50		0.50
Expected volatility	56	%	41	%
Expected dividend yield	—		—