Stock Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Total Compensation Cost from Share-Based Payments

The Company’s statements of operations included total compensation cost from awards under the Plans and purchases under the ESPP for the years ended December 31, as follows:

In thousands	2013		2012		2011
Compensation cost from:
Stock options	$	16,364	$	10,626	$	2,893
Stock and stock units		18,458		9,467		4,601
Purchases of common stock at a discount		599		248		181
	$	35,421	$	20,341	$	7,675
Compensation cost included in:
Research and development expense	$	15,150	$	9,846	$	3,782
Selling, general and administrative expense		20,271		10,495		3,893
	$	35,421	$	20,341	$	7,675

Summary of Information About Stock Options

The following table summarizes information about stock options as of and for the years ended December 31 as follows:

In thousands, except per share amounts	2013		2012		2011
Weighted average fair value of options granted, per share	$	8.38	$	13.04	$	5.80
Total cash received from exercises of stock options		4,847		9,677		4,648
Total intrinsic value of stock options exercised		13,829		27,572		5,169

Weighted-Average Assumptions of Fair Value of Options Granted

The weighted average fair value of options granted in the years ended December 31, 2013, 2012 and 2011, reflect the following weighted-average assumptions:

	2013			2012			2011
Expected life of options granted (in years)		6.9			7.1			7.5
Expected volatility		76	%		76	%		75	%
Risk-free rate		1.74	%		1.32	%		2.53	%
Expected dividends		0	%		0	%		0	%

Stock Option Activity

Stock option activity under the Company’s stock plans for the year ended December 31, 2013 was as follows:

	Number of Shares			Weighted Average Exercise  Price Per Share
Options outstanding, January 1, 2013		8,228,334		$	10.20
Granted		4,732,275		$	13.10
Forfeited		(1,597,853	)	$	17.92
Exercised		(983,088	)	$	4.93
Options outstanding, December 31, 2013		10,379,668		$	10.83

Summary of Stock Options Outstanding

The following table summarizes information about stock options outstanding as of December 31, 2013:

	Options Outstanding		Options Exercisable		Options Vested and Expected To Vest
Number of options		10,379,668		4,489,008		10,188,693
Weighted average exercise price per share	$	10.83	$	7.86	$	10.73
Aggregate intrinsic value (in 000’s)	$	11,240	$	6,886	$	11,217
Weighted average remaining contractual term (years)		6.98		4.18		6.94

Stock and stock units

Stock and Stock Unit Activity

Stock and stock unit activity under the Company’s stock plans for the year ended December 31, 2013 was as follows:

	Number of Shares			Weighted Average Grant  Date Fair Value
Outstanding, January 1, 2013		1,903,445		$	9.55
Granted / awarded		1,798,448		$	15.24
Forfeited		(209,986	)	$	16.05
Vested or restrictions lapsed		(1,444,307	)	$	9.12
Outstanding, December 31, 2013		2,047,600		$	14.18