Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net loss	$ (36,102)	$ (198,704)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	55,472	57,384
Depreciation and amortization expense	16,415	16,363
Deferred income taxes	2,060	0
Other non-cash items, net	(3,835)	629
Changes in operating assets and liabilities:
Accounts receivable, net	(2,512)	(5,863)
Inventories	(4,771)	(2,635)
Prepaid expenses and other assets	(7,325)	(15,233)
Accounts payable	(343)	(23,556)
Accrued expenses and other liabilities	(29,922)	(20,921)
Accrued restructuring expense	(1,459)	(24,367)
Deferred revenues	(2,815)	(5,333)
Net cash used in operating activities	(15,137)	(222,236)
Cash flows from investing activities:
Purchases of marketable securities	(224,624)	(125,655)
Maturities of marketable securities	131,173	371,423
Expenditures for property and equipment	(11,974)	(10,558)
Increase in restricted cash and cash equivalents	(3)	(21,971)
Decrease in restricted cash and cash equivalents (VIE)	2,637	0
Decrease in other assets	83	799
Net cash (used in) provided by investing activities	(102,708)	214,038
Cash flows from financing activities:
Issuances of common stock under benefit plans	8,846	41,616
Payments on capital lease obligations	(4,041)	(4,497)
Proceeds from capital lease financing	0	13,386
Payments on construction financing lease obligation	(103)	(91)
Net cash provided by financing activities	4,702	50,414
Effect of changes in exchange rates on cash	2,620	(2,596)
Net increase in cash and cash equivalents	(110,523)	39,620
Cash and cash equivalents—beginning of period	714,768	625,259
Cash and cash equivalents—end of period	604,245	664,879
Supplemental disclosure of cash flow information:
Cash paid for interest	20,603	21,538
Cash paid for income taxes	581	60
Issuances of common stock exercises from employee benefit plans receivable	$ 593	$ 964