Stock-based Compensation Expense (Tables)

6 Months Ended

Jun. 30, 2014

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

Stock-based compensation expense by line item

During the three and six months ended June 30, 2014 and 2013, the Company recognized the following stock-based compensation expense:

	Three Months Ended June 30,						Six Months Ended June 30,
	2014			2013			2014			2013
	(in thousands)
Stock-based compensation expense by type of award:
Stock options	$	26,985		$	29,949		$	52,112		$	49,623
Restricted stock and restricted stock units	14,020			9,732			33,013			19,110
ESPP share issuances	1,681			2,051			4,348			4,573
Less stock-based compensation expense capitalized to inventories	(242		)	(382		)	(449		)	(681		)
Total stock-based compensation expense included in costs and expenses	$	42,444		$	41,350		$	89,024		$	72,625
Stock-based compensation expense by line item:
Research and development expenses	$	27,253		$	25,740		$	60,153		$	45,089
Sales, general and administrative expenses	15,191			15,610			28,871			27,536
Total stock-based compensation expense included in costs and expenses	$	42,444		$	41,350		$	89,024		$	72,625

Unrecognized stock-based compensation expense, net of estimated forfeitures

The following table sets forth the Company's unrecognized stock-based compensation expense, net of estimated forfeitures, by type of award and the weighted-average period over which that expense is expected to be recognized:

	As of June 30, 2014
	Unrecognized Expense, Net of Estimated Forfeitures		Weighted-average Recognition Period
	(in thousands)		(in years)
Type of award:
Stock options	$	158,362	2.33
Restricted stock and restricted stock units	$	102,006	2.14
ESPP share issuances	$	4,082	0.58

Stock options outstanding and exercisable

The following table summarizes information about stock options outstanding and exercisable at June 30, 2014:

	Options Outstanding			Options Exercisable
Range of Exercise Prices	Number Outstanding	Weighted-average Remaining Contractual Life	Weighted-average Exercise Price	Number Exercisable	Weighted-average Exercise Price
	(in thousands)	(in years)	(per share)	(in thousands)	(per share)
$10.41–$20.00	368	2.01	$15.59	368	$15.59
$20.01–$30.00	889	5.42	$29.46	708	$29.35
$30.01–$40.00	4,876	5.17	$36.20	3,758	$35.73
$40.01–$50.00	3,508	8.37	$46.32	890	$46.55
$50.01–$60.00	1,348	7.34	$54.11	800	$54.63
$60.01–$70.00	129	9.15	$65.71	20	$64.33
$70.01–$80.00	2,095	9.60	$76.73	308	$74.18
$80.01–$88.18	1,336	9.02	$83.11	375	$82.53
Total	14,549	7.10	$49.77	7,227	$41.65