Stock-based Compensation Expense (Tables)

3 Months Ended

Mar. 31, 2017

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

Stock-based compensation expense by line item

During the three months ended March 31, 2017 and 2016, the Company recognized the following stock-based compensation expense:

	Three Months Ended March 31,
	2017			2016
	(in thousands)
Stock-based compensation expense by type of award:
Stock options	$	26,981		$	26,260
Restricted stock and restricted stock units	40,745			27,533
ESPP share issuances	2,064			2,524
Less stock-based compensation expense capitalized to inventories	(808		)	(845		)
Total stock-based compensation included in costs and expenses	$	68,982		$	55,472
Stock-based compensation expense by line item:
Research and development expenses	$	44,837		$	34,448
Sales, general and administrative expenses	24,145			21,024
Total stock-based compensation included in costs and expenses	$	68,982		$	55,472

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 March 31, 2017
	Unrecognized Expense		Weighted-average Recognition Period
	(in thousands)		(in years)
Type of award:
Stock options	$	200,906	2.65
Restricted stock and restricted stock units	$	291,088	2.57
ESPP share issuances	$	2,016	0.43

Stock options outstanding and exercisable

The following table summarizes information about stock options outstanding and exercisable at March 31, 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	134	0.85	$	18.93	134	$	18.93
$20.01–$40.00	1,576	2.95	$	33.77	1,576	$	33.77
$40.01–$60.00	1,678	5.34	$	48.36	1,678	$	48.36
$60.01–$80.00	1,279	6.88	$	75.86	924	$	75.61
$80.01–$100.00	5,932	8.65	$	89.51	1,757	$	89.81
$100.01–$120.00	1,572	7.79	$	109.33	799	$	109.30
$120.01–$134.69	1,427	8.22	$	130.53	668	$	130.27
Total	13,598	7.19	$	82.60	7,536	$	71.52