CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net loss from continuing operations	$ (109,403)	$ (43,028)
Adjustments to reconcile net loss to net cash used for operating activities from continuing operations:
Provision for cash discounts	262
Depreciation	419	54
Amortization of debt issuance costs and discounts	1,659
Amortization of discount or premium on available-for-sale securities	998	1,968
Share-based compensation expense	11,961	6,242
Loss on disposal of property and equipment	105
Inventory impairment	7,525
Changes in assets and liabilities:
Accounts receivable	(2,569)
Inventories	(16,022)	(323)
Prepaid expenses and other assets	821	(6,052)
Accounts payable	(8,762)	3,306
Accrued and other liabilities	1,390	1,286
Deferred revenue	1,696
Net cash used for operating activities from continuing operations	(109,920)	(36,547)
Net cash used for operating activities from discontinued operations	(410)	(539)
Net cash used for operating activities	(110,330)	(37,086)
Cash flows from investing activities:
Property and equipment purchases	(1,845)	(146)
Purchases of available-for-sale securities	(209,118)	(181,810)
Proceeds from sales and maturities of available-for-sale securities	130,500	57,635
Non-current assets	(228)
Net cash used for investing activities	(80,691)	(124,321)
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	1,083	10,671
Proceeds from sale of common stock through employee stock purchase plan	508	122
Net proceeds from issuance of common stock		192,000
Net cash provided by financing activities	257,129	202,793
Net increase in cash and cash equivalents	66,108	41,386
Cash and cash equivalents:
Beginning of period	58,605	39,554
End of period	$ 124,713	$ 80,940