CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net loss from continuing operations	$ (174,946)	$ (139,733)	$ (47,026)
Adjustments to reconcile net loss from continuing operations to net cash used for operating activities from continuing operations:
Depreciation	973	271	102
Amortization of debt issuance costs and discounts	8,369
Amortization of discount or premium on available-for-sale securities	2,635	3,950	3,118
Share-based compensation expense	32,397	15,938	7,353
Unrealized foreign currency remeasurement gain	(235)
Loss on disposal and impairment of property and equipment	896
Inventory impairment	7,525
Changes in assets and liabilities:
Accounts receivable	(9,436)	(2,778)
Inventories	(30,195)	(22,050)	118
Prepaid expenses and other assets	2,086	(17,366)	(145)
Accounts payable	(14,821)	22,202	545
Accrued and other liabilities	13,170	7,385	15
Deferred revenue	26,465	1,150
Net cash used for operating activities from continuing operations	(135,117)	(131,031)	(35,920)
Net cash used for operating activities from discontinued operations	(208)	(885)	(980)
Net cash used for operating activities	(135,325)	(131,916)	(36,900)
Cash flows from investing activities:
Property and equipment purchases	(1,795)	(1,669)	(201)
Purchases of available-for-sale securities	(329,145)	(226,654)	(137,409)
Proceeds from maturity of available-for-sale securities	242,500	133,250	129,000
Proceeds from sale of available-for-sale securities		40,763
Non-current assets	(1,681)	(287)
Net cash used for investing activities	(90,121)	(54,597)	(8,610)
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	13,706	13,250	2,354
Sale of common stock through employee stock purchase plan	859	314	211
Net proceeds from issuance of common stock		192,000	45,283
Net cash provided by financing activities from continuing operations	270,103	205,564	47,848
Net increase in cash and cash equivalents	44,657	19,051	2,338
Cash and cash equivalents:
Beginning of year	58,605	39,554	37,216
End of year	103,262	58,605	39,554
Supplemental cash flow disclosure:
Interest paid	5,000
Income taxes paid	32	7	24
Non-cash investing activities:
Unrealized gain on securities	$ 33	$ 8	$ 21