Stock-based Compensation Expense (Tables)

9 Months Ended

Sep. 30, 2017

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, 2017 and 2016, the Company recognized the following stock-based compensation expense:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
	(in thousands)
Stock-based compensation expense by type of award:
Stock options	$	25,969		$	28,773		$	80,865		$	86,859
Restricted stock and restricted stock units	46,737			30,966			131,388			88,107
ESPP share issuances	2,428			2,425			6,738			6,385
Less stock-based compensation expense capitalized to inventories	(1,364		)	(955		)	(3,657		)	(2,728		)
Total stock-based compensation included in costs and expenses	$	73,770		$	61,209		$	215,334		$	178,623
Stock-based compensation expense by line item:
Research and development expenses	$	46,186		$	39,980		$	134,855		$	115,068
Sales, general and administrative expenses	27,584			21,229			80,479			63,555
Total stock-based compensation included in costs and expenses	$	73,770		$	61,209		$	215,334		$	178,623

Unrecognized stock-based compensation expense, net of estimated forfeitures

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

	As of September 30, 2017
	Unrecognized Expense		Weighted-average Recognition Period
	(in thousands)		(in years)
Type of award:
Stock options	$	175,298	2.60
Restricted stock and restricted stock units	$	289,008	2.64
ESPP share issuances	$	2,636	0.46

Stock options outstanding and exercisable

The following table summarizes information about stock options outstanding and exercisable at September 30, 2017:

	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	128	0.35	$	18.93	128	$	18.93
$20.01–$40.00	834	2.21	$	34.51	834	$	34.51
$40.01–$60.00	877	4.83	$	49.17	877	$	49.17
$60.01–$80.00	821	6.46	$	75.62	649	$	75.44
$80.01–$100.00	4,587	8.33	$	89.37	1,397	$	89.47
$100.01–$120.00	1,137	7.36	$	109.34	586	$	109.24
$120.01–$140.00	1,260	7.88	$	130.24	688	$	129.86
$140.01–$160.00	—	0.00	$	—	—	$	—
$160.01–$163.74	634	9.80	$	162.94	3	$	162.94
Total	10,278	7.22	$	91.28	5,162	$	77.92