Stock Compensation (Tables)

12 Months Ended

Dec. 31, 2015

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	2015		2014		2013
Compensation cost from:
Stock options	$	14,648	$	16,608	$	16,364
Stock and stock units		21,826		15,346		18,458
Purchases of common stock at a discount		546		449		599
	$	37,020	$	32,403	$	35,421
Compensation cost included in:
Research and development expense	$	14,297	$	13,856	$	15,150
Selling, general and administrative expense		22,723		18,547		20,271
	$	37,020	$	32,403	$	35,421

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	2015		2014		2013
Weighted average fair value of options granted, per share	$	5.24	$	5.20	$	8.38
Total cash received from exercises of stock options		2,895		2,356		4,847
Total intrinsic value of stock options exercised		1,718		1,619		13,829

Weighted-Average Assumptions of Fair Value of Options Granted

The weighted average fair value of options granted in the years ended December 31, 2015, 2014 and 2013, reflect the following weighted-average assumptions:

	2015			2014			2013
Expected life of options granted (in years)		6.5			6.8			6.9
Expected volatility		76	%		84	%		76	%
Risk-free rate		1.77	%		2.16	%		1.74	%
Expected dividends		0	%		0	%		0	%

Stock Option Activity

Stock option activity under the Company’s stock plans for the year ended December 31, 2015 was as follows:

	Number of Shares			Weighted Average Exercise Price Per Share
Options outstanding, January 1, 2015		10,148,087		$	10.09
Granted		1,534,425		$	7.49
Forfeited		(780,914	)	$	9.90
Exercised		(668,629	)	$	5.78
Options outstanding, December 31, 2015		10,232,969		$	10.00

Summary of Stock Options Outstanding

The following table summarizes information about stock options outstanding as of December 31, 2015:

	Options Outstanding		Options Exercisable		Options Vested and Expected To Vest
Number of options		10,232,969		6,458,568		9,511,988
Weighted average exercise price per share	$	10.00	$	10.27	$	10.10
Aggregate intrinsic value (in 000’s)	$	6,147	$	4,924	$	5,772
Weighted average remaining contractual term (years)		6.67		5.66		6.55

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, 2015 was as follows:

	Number of Shares			Weighted Average Grant Date Fair Value
Outstanding, January 1, 2015		3,503,153		$	9.97
Granted / awarded		3,042,995		$	8.67
Forfeited		(168,157	)	$	8.07
Vested or restrictions lapsed		(1,884,937	)	$	11.21
Outstanding, December 31, 2015		4,493,054		$	8.64