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Stock-Based Compensation And Employee Purchase Plans (Tables)

12 Months Ended

Dec. 31, 2014

Stock-based employee compensation expense

The following table summarizes the effect of compensation cost arising from share-based payment arrangements in the Company's Statements of Operations for the years ended December 31, 2014, 2013 and 2012 for the Company's stock option plans, the ESPP and other share-based awards (in thousands):

		Years ended December 31,
		2014			2013			2012
Research and development		$	5,657		$	4,107		$	3,343
Selling, general and administrative			9,346			5,330			4,205
Amounts charged against income, before
income tax expense		$	15,003		$	9,437		$	7,548

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

			Years ended December 31,
			2014			2013			2012
Dividend yield			—			—			—
Expected volatility			57.98% — 60.69%			59.15% — 60.69%			61.22% — 67.58%
Risk-free interest rate			1.4% — 1.8%			0.7% — 3.7%			0.6% — 1.1%
Expected term (in years)			5.2 — 5.6			5.2 — 6.0			5.1 — 5.9

Disclosure Of Share-Based Compensation Arrangements By Share-Based Payment Award

A summary of activity related to aggregate stock options under all plans is indicated in the following table (in thousands, except per share amounts):

		Year ended December 31, 2014
					Weighted			Weighted
		Number			average			average remaining			Aggregate
		of			exercise			contractual			intrinsic
		options			price			term			value
		(in thousands)						(in years)			(in thousands)
Options outstanding at beginning
of year		6,656		$	8.03
Options granted		1,269			32.80
Options exercised		1,245			7.48
Options forfeited/expired		559			11.56
Options outstanding at end of year		6,121			12.96			7.21		$	141,011

Vested and expected to vest		5,838			12.53			7.14		$	136,909

Options exercisable at end of year		3,246		$	7.16			6.11		$	92,865

Restricted Stock Units

Disclosure Of Share-Based Compensation Arrangements By Share-Based Payment Award

A summary of activity related to aggregate restricted stock, restricted stock units and deferred stock units as of December 31, 2014, is indicated in the following table (shares in thousands, except per share amounts):

		Number of		Weighted-average
		shares		grant date fair value
Nonvested at beginning of year		752		$	8.89
Granted		394			31.07
Vested		(229)			9.19
Forfeited		(59)			12.40
Nonvested at December 31, 2014		858		$	18.75

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

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