Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Total Compensation Cost from Share-Based Payments

The Company’s statements of operations included total compensation cost from share-based payments for the three-month periods ended March 31, 2013 and 2012, as follows:

	Three Months  Ended March 31,
In thousands	2013		2012
Compensation cost from:
Stock options	$	3,360	$	2,889
Stock and stock units		2,147		1,975
Purchases of common stock at a discount		103		49
	$	5,610	$	4,913
Compensation cost included in:
Research and development expenses	$	2,654	$	2,516
Selling, general and administrative expenses		2,956		2,397
	$	5,610	$	4,913

Stock Option Activity

Stock option activity under the Company’s stock plans for the three-month period ended March 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		734,600		$	20.89
Forfeited		(32,569	)	$	21.45
Exercised		(246,060	)	$	5.17
Options outstanding, March 31, 2013		8,684,305		$	11.20

Stock and Stock Units

Stock and Stock Unit Activity

Stock and stock unit activity under the Company’s stock plans for the three-month period ended March 31, 2013 was as follows:

	Number of Shares			Weighted Average Grant  Date Fair Value
Outstanding, January 1, 2013		1,903,445		$	9.55
Granted		824,550		$	20.78
Forfeited		(1,833	)	$	4.90
Vested or restrictions lapsed		(795,992	)	$	7.31
Outstanding, March 31, 2013		1,930,170		$	15.28