Stock-based Compensation Expense (Tables)

9 Months Ended

Sep. 30, 2016

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

Stock-based compensation expense by line item

During the three and nine months ended September 30, 2016 and 2015, the Company recognized the following stock-based compensation expense:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
	(in thousands)
Stock-based compensation expense by type of award:
Stock options	$	28,773		$	39,074		$	86,859		$	105,720
Restricted stock and restricted stock units	30,966			26,203			88,107			78,274
ESPP share issuances	2,425			1,738			6,385			5,703
Less stock-based compensation expense capitalized to inventories	(955		)	(1,281		)	(2,728		)	(3,318		)
Total stock-based compensation included in costs and expenses	$	61,209		$	65,734		$	178,623		$	186,379
Stock-based compensation expense by line item:
Research and development expenses	$	39,980		$	44,701		$	115,068		$	124,550
Sales, general and administrative expenses	21,229			21,033			63,555			61,829
Total stock-based compensation included in costs and expenses	$	61,209		$	65,734		$	178,623		$	186,379

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 September 30, 2016
	Unrecognized Expense, Net of Estimated Forfeitures		Weighted-average Recognition Period
	(in thousands)		(in years)
Type of award:
Stock options	$	185,148	2.66
Restricted stock and restricted stock units	$	206,336	2.57
ESPP share issuances	$	2,886	0.47

Stock options outstanding and exercisable

The following table summarizes information about stock options outstanding and exercisable at September 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	1.35	$	18.93	137	$	18.93
$20.01–$40.00	1,816	3.32	$	34.08	1,815	$	34.07
$40.01–$60.00	1,937	5.89	$	48.19	1,719	$	48.57
$60.01–$80.00	1,348	7.38	$	75.90	809	$	75.51
$80.01–$100.00	4,598	8.74	$	90.62	1,271	$	89.38
$100.01–$120.00	1,627	8.33	$	109.33	606	$	109.29
$120.01–$134.69	1,484	8.80	$	130.60	510	$	130.06
Total	12,947	7.29	$	80.99	6,867	$	66.29