Stock-based Compensation Expense (Tables)

3 Months Ended

Mar. 31, 2015

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

Stock-based compensation expense by line item

During the three months ended March 31, 2015 and 2014, the Company recognized the following stock-based compensation expense included in loss from continuing operations:

	Three Months Ended March 31,
	2015			2014
	(in thousands)
Stock-based compensation expense by type of award:
Stock options	$	28,959		$	25,127
Restricted stock and restricted stock units	27,169			18,993
ESPP share issuances	2,140			2,667
Less stock-based compensation expense capitalized to inventories	(884		)	(207		)
Total stock-based compensation included in costs and expenses	$	57,384		$	46,580
Stock-based compensation expense by line item:
Research and development expenses	$	38,217		$	32,900
Sales, general and administrative expenses	19,167			13,680
Total stock-based compensation included in costs and expenses	$	57,384		$	46,580

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 March 31, 2015
	Unrecognized Expense, Net of Estimated Forfeitures		Weighted-average Recognition Period
	(in thousands)		(in years)
Type of award:
Stock options	$	199,256	2.31
Restricted stock and restricted stock units	$	201,465	2.88
ESPP share issuances	$	2,205	0.45

Stock options outstanding and exercisable

The following table summarizes information about stock options outstanding and exercisable at March 31, 2015:

	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)
$17.16–$20.00	165	2.51	$	18.69	165	$	18.69
$20.01–$40.00	3,207	4.24	$	34.97	2,711	$	34.73
$40.01–$60.00	3,339	7.33	$	48.55	1,499	$	50.27
$60.01–$80.00	1,837	8.59	$	76.07	492	$	74.88
$80.01–$100.00	2,232	8.70	$	90.29	542	$	86.07
$100.01–$120.00	1,898	9.84	$	109.23	1	$	110.59
$120.01–$125.63	4	9.82	$	125.63	—	$	—
Total	12,682	7.28	$	65.17	5,410	$	47.36