CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended		288 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013
Operating activities:
Net loss	$ (5,544)	$ (9,455)	$ (275,898)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation and amortization	150	179	8,297
Loss on property held for resale			110
Amortization of discounts and premiums on investments			(1,704)
Stock compensation expense	(43)	815	17,452
Increase (decrease) due to change in fair value of warrants	(1,619)	900	(18,156)
Inventory write downs and reserves			2,240
Stock issued pursuant to license agreement			3,300
Provision for losses on accounts receivable			204
Changes in operating assets and liabilities:
Inventories			(2,335)
Other current assets	52	181	(529)
Accounts payable and accrued expenses	(232)	421	2,783
Accrued employee benefits	475	356	858
Net cash used for operating activities	(6,761)	(6,603)	(263,378)
Investing activities:
Organizational costs			(73)
Purchase of short-term investments			(217,041)
Maturities of short-term investments			218,745
Property and equipment purchases	(18)	(82)	(7,508)
Proceeds from sale of property held for resale			400
Net cash used for investing activities	(18)	(82)	(5,477)
Financing activities:
Net proceeds from issuance of preferred stock		37,723	89,267
Net proceeds from issuance of common stock and warrants	2,378	176	187,432
Payments received for stock purchase rights and other, net			3,500
Proceeds from long-term debt			751
Principal payments under long-term debt obligations	(11)	(11)	(2,851)
Other, net			(18)
Net cash provided by financing activities	2,367	37,888	278,081
Net increase (decrease) in cash and cash equivalents	(4,412)	31,203	9,226
Cash and cash equivalents at beginning of period	13,638	5,530
Cash and cash equivalents at end of period	9,226	36,733	9,226
Supplemental cash flow information (non-cash):
Accretion of convertible preferred stock	$ 1,263	$ 289	$ 6,224