Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net loss	$ (419,696)	$ (391,839)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	30,428	29,960
Stock-based compensation expense	120,645	89,024
Deferred income taxes	6,346	0
Other non-cash items, net	6,045	22
Changes in operating assets and liabilities:
Accounts receivable, net	(21,197)	2,518
Inventories	(9,426)	1,194
Prepaid expenses and other assets	(15,397)	(17,538)
Accounts payable	(3,033)	7,671
Accrued expenses and other liabilities	38,206	(9,459)
Accrued restructuring expense	(26,012)	(9,369)
Deferred revenues	(9,303)	(5,866)
Net cash used in operating activities	(302,394)	(303,682)
Cash flows from investing activities:
Purchases of marketable securities	(125,655)	(703,977)
Sales and maturities of marketable securities	741,725	801,206
Payment for acquisition of variable interest entity	(80,000)	0
Expenditures for property and equipment	(23,978)	(27,227)
(Increase) decrease in restricted cash and cash equivalents	(21,975)	1
Decrease in restricted cash and cash equivalents (VIE)	2,277	0
Decrease (increase) in other assets	87	(528)
Net cash provided by investing activities	492,481	69,475
Cash flows from financing activities:
Issuances of common stock from employee benefit plans	87,850	117,947
Payments on capital lease obligations	(14,441)	(11,884)
Proceeds from capital lease financing	13,386	0
Payments on Fan Pier lease obligation	(30,292)	(30,292)
Payments returned related to Fan Pier lease obligation	0	8,050
Net cash provided by (used in) financing activities	56,503	83,821
Effect of changes in exchange rates on cash	(1,306)	1,645
Net increase (decrease) in cash and cash equivalents	245,284	(148,741)
Cash and cash equivalents—beginning of period	625,259	569,299
Cash and cash equivalents—end of period	870,543	420,558
Supplemental disclosure of cash flow information:
Cash paid for interest	12,777	31,933
Cash paid for income taxes	1,022	798
Capitalization of costs related to Fan Pier lease obligation	0	25,564
Assets acquired under capital lease	0	8,985
Issuances of common stock exercises from employee benefit plans receivable	$ 166	$ 0