Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net loss	$ (198,704)us-gaap_ProfitLoss	$ (232,457)us-gaap_ProfitLoss
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	16,363	15,788
Stock-based compensation expense	57,384us-gaap_ShareBasedCompensation	46,580us-gaap_ShareBasedCompensation
Other non-cash items, net	629us-gaap_OtherNoncashIncomeExpense	(173)us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:
Accounts receivable, net	(5,863)	25,237
Inventories	(2,635)us-gaap_IncreaseDecreaseInInventories	2,488us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	(15,233)	(17,937)
Accounts payable	(23,556)	978
Accrued expenses and other liabilities	(5,866)	(13,536)
Accrued restructuring expense	(24,367)	(4,486)
Deferred revenues	(5,333)	1,756
Net cash used in operating activities	(207,181)	(175,762)
Cash flows from investing activities:
Purchases of marketable securities	(125,655)	(380,949)
Sales and maturities of marketable securities	371,423	376,544
Expenditures for property and equipment	(10,558)	(15,526)
Increase in restricted cash and cash equivalents	(21,971)	0
Decrease (increase) in other assets	799	(476)
Net cash provided by (used in) investing activities	214,038	(20,407)
Cash flows from financing activities:
Issuances of common stock from employee benefit plans	41,616	60,134
Payments on capital lease obligations	(4,497)us-gaap_PaymentsOfFinancingCosts	(2,622)us-gaap_PaymentsOfFinancingCosts
Proceeds from capital lease financing	13,386	0
Payments on Fan Pier lease obligation	(15,146)	(15,146)
Payments returned related to Fan Pier lease obligation	0	8,050
Net cash provided by (used in) financing activities	35,359	50,416
Effect of changes in exchange rates on cash	(2,596)	499
Net increase (decrease) in cash and cash equivalents	39,620	(145,254)
Cash and cash equivalents—beginning of period	625,259	569,299
Cash and cash equivalents—end of period	664,879	424,045
Supplemental disclosure of cash flow information:
Cash paid for interest	6,483us-gaap_InterestPaid	15,970us-gaap_InterestPaid
Cash paid for income taxes	60us-gaap_IncomeTaxesPaid	140us-gaap_IncomeTaxesPaid
Capitalization of costs related to Fan Pier lease obligation	0	25,564
Assets acquired under capital lease	0us-gaap_CapitalLeaseObligationsIncurred	3,619us-gaap_CapitalLeaseObligationsIncurred
Issuances of common stock exercises from employee benefit plans receivable	$ 964us-gaap_ConversionOfStockAmountIssued1	$ 0us-gaap_ConversionOfStockAmountIssued1

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The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

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Net total Increase or Decrease in the accrual for restructuring costs during the reporting period.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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