CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net loss from continuing operations	$ (82,647)	$ (174,946)	$ (139,733)
Adjustments to reconcile net loss to net cash used for operating activities from continuing operations:
Depreciation and amortization	1,112us-gaap_Depreciation	973us-gaap_Depreciation	271us-gaap_Depreciation
Amortization of debt issuance costs and discounts	15,923	8,369
Amortization of discount or premium on available-for-sale securities	4,016	2,635	3,950
Share-based compensation expense	9,766us-gaap_ShareBasedCompensation	32,397us-gaap_ShareBasedCompensation	15,938us-gaap_ShareBasedCompensation
Unrealized foreign currency remeasurement gain		(235)
Loss on disposal of property and equipment		896
Inventory impairment	2,170	7,525
Changes in assets and liabilities:
Accounts receivable	619	(9,436)	(2,778)
Inventories	11,886us-gaap_IncreaseDecreaseInInventories	(30,195)us-gaap_IncreaseDecreaseInInventories	(22,050)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	7,734	2,086	(17,366)
Accounts payable	(329)	(14,821)	22,202
Accrued and other liabilities	(9,061)	13,170	7,385
Deferred revenue	706	26,465	1,150
Net cash used for operating activities from continuing operations	(38,105)	(135,117)	(131,031)
Net cash used for operating activities from discontinued operations		(208)	(885)
Net cash used for operating activities	(38,105)	(135,325)	(131,916)
Cash flows from investing activities:
Property and equipment purchases	(262)	(1,795)	(1,669)
Purchases of available-for-sale securities	(240,983)	(329,145)	(226,654)
Proceeds from sales and maturities of available-for-sale securities	260,500	242,500	133,250
Proceeds from sale of available-for-sale securities			40,763
Non-current assets	(3,362)	(1,681)	(287)
Net cash provided by (used for) investing activities	15,893	(90,121)	(54,597)
Cash flows from financing activities:
Net proceeds from debt issuances		290,247
Payments for capped call transactions		(34,709)
Net proceeds from exercise of common stock options	1,719	13,706	13,250
Proceeds from sale of common stock through employee stock purchase plan	405	859	314
Net proceeds from issuance of common stock			192,000
Net cash provided by financing activities	2,124	270,103	205,564
Net (decrease) increase in cash and cash equivalents	(20,088)	44,657	19,051
Cash and cash equivalents:
Beginning of year	103,262	58,605	39,554
End of year	83,174	103,262	58,605
Supplemental cash flow disclosure:
Interest paid	20,251us-gaap_InterestPaid	5,000us-gaap_InterestPaid
Income taxes paid	94us-gaap_IncomeTaxesPaidNet	32us-gaap_IncomeTaxesPaidNet	7us-gaap_IncomeTaxesPaidNet
Non-cash investing activities:
Unrealized (loss) gain on securities	$ (94)us-gaap_UnrealizedGainLossOnSecurities	$ 33us-gaap_UnrealizedGainLossOnSecurities	$ 8us-gaap_UnrealizedGainLossOnSecurities

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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No definition available.

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The cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards other than stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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No definition available.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on 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 cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Nonrecurring impairment charges related to the write-off of production-related equipment and inventory. This tag is used when an Entity charges this cost to cost of goods sold.

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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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Amount of unrealized gain (loss) recognized in the income statement on unsold other securities.

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The net cash inflow from the issuance of common stock net of offering costs.

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No definition available.

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