Stock-based Compensation Expense (Tables)

6 Months Ended

Jun. 30, 2016

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, 2016 and 2015, the Company recognized the following stock-based compensation expense:

	Three Months Ended June 30,						Six Months Ended June 30,
	2016			2015			2016			2015
	(in thousands)
Stock-based compensation expense by type of award:
Stock options	$	31,826		$	37,687		$	58,086		$	66,646
Restricted stock and restricted stock units	29,608			24,902			57,141			52,071
ESPP share issuances	1,436			1,825			3,960			3,965
Less stock-based compensation expense capitalized to inventories	(928		)	(1,153		)	(1,773		)	(2,037		)
Total stock-based compensation included in costs and expenses	$	61,942		$	63,261		$	117,414		$	120,645
Stock-based compensation expense by line item:
Research and development expenses	$	40,640		$	41,632		$	75,088		$	79,849
Sales, general and administrative expenses	21,302			21,629			42,326			40,796
Total stock-based compensation included in costs and expenses	$	61,942		$	63,261		$	117,414		$	120,645

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, 2016
	Unrecognized Expense, Net of Estimated Forfeitures		Weighted-average Recognition Period
	(in thousands)		(in years)
Type of award:
Stock options	$	176,251	2.66
Restricted stock and restricted stock units	$	201,858	2.57
ESPP share issuances	$	5,546	0.64

Stock options outstanding and exercisable

The following table summarizes information about stock options outstanding and exercisable at June 30, 2016:

	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)
$18.93–$20.00	137	1.61	$	18.93	137	$	18.93
$20.01–$40.00	1,964	3.45	$	34.24	1,962	$	34.23
$40.01–$60.00	2,066	6.07	$	48.14	1,657	$	48.66
$60.01–$80.00	1,368	7.62	$	75.90	734	$	75.39
$80.01–$100.00	3,555	8.60	$	90.68	1,080	$	88.91
$100.01–$120.00	1,644	8.57	$	109.32	500	$	109.27
$120.01–$134.69	1,497	9.05	$	130.61	420	$	129.84
Total	12,231	7.21	$	79.37	6,490	$	63.32