Equity Incentive Plans and Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Shares available for grant under stock-based incentive plans

A summary of shares available for grant under the Company’s plans is as follows:



	Shares Available for Grant
Shares available as of December 31, 2012	2,729,159
Stock options granted	(1,756,312	)
Stock options forfeited	1,637,125
Stock options expired under former plans	(475,419	)
Nonvested equity stock and stock units granted (1)	(457,428	)
Nonvested equity stock and stock units forfeited (1)	181,137
Total available for grant as of June 30, 2013	1,858,262

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(1)	For purposes of determining the number of shares available for grant under the 2006 Plan against the maximum number of shares authorized, each restricted stock granted reduces the number of shares available for grant by 1.5 shares and each restricted stock forfeited increases shares available for grant by 1.5 shares.

Schedule of stock option activity

The following table summarizes stock option activity under the 1997 Plan, 1999 Plan and 2006 Plan for the six months ended June 30, 2013 and information regarding stock options outstanding, exercisable, and vested and expected to vest as of June 30, 2013.



	Options Outstanding
	Number of Shares		Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
	(In thousands, except per share amounts)
Outstanding as of December 31, 2012	13,094,815		$	12.79
Options granted	1,756,312		5.51
Options exercised	(44,850	)	6.23
Options forfeited	(1,637,125	)	11.17
Outstanding as of June 30, 2013	13,169,152		12.04		5.93	$	21,033
Vested or expected to vest at June 30, 2013	12,273,266		12.47		5.68	18,444
Options exercisable at June 30, 2013	6,615,397		17.59		3.45	3,088

Weighted-average assumptions for Stock Option Plans

The following table presents the weighted-average assumptions used to estimate the fair value of stock options granted that contain only service conditions in the periods presented.



	Stock Option Plans
	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Stock Option Plans
Expected stock price volatility	47		%	68		%	47		%	60-68%
Risk free interest rate	0.8		%	0.9		%	0.8-0.9%			0.7-0.9%
Expected term (in years)	5.4			5.7			5.4			5.6 –5.7
Weighted-average fair value of stock options granted to employees	$	2.61		$	3.41		$	2.35		$	3.83

Weighted- average assumptions for Employee Stock Purchase Plan



	Employee Stock Purchase Plan
	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Employee Stock Purchase Plan
Expected stock price volatility	48		%	63		%	48		%	63		%
Risk free interest rate	0.1		%	0.2		%	0.1		%	0.2		%
Expected term (in years)	0.5			0.5			0.5			0.5
Weighted-average fair value of purchase rights granted under the purchase plan	$	1.94		$	1.61		$	1.94		$	1.61

Schedule of nonvested equity stock and stock units activity

The following table reflects the activity related to nonvested equity stock and stock units for the six months ended June 30, 2013:



Nonvested Equity Stock and Stock Units	Shares		Weighted- Average Grant-Date Fair Value
Nonvested at December 31, 2012	922,491		$	10.24
Granted	304,952		5.51
Vested	(312,070	)	11.25
Forfeited	(120,753	)	11.80
Nonvested at June 30, 2013	794,620		7.79