Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 5,282	$ 9,311	[1]
Marketable securities	29,594	34,804	[1]
Prepaids and other current assets	1,855	1,550	[1]
Total current assets	36,731	45,665	[1]
Property and equipment, net	66	74	[1]
Deposits and other assets	118	130	[1]
Total assets	36,915	45,869	[1]
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	869	658	[1]
Accrued clinical expense	2,564	2,370	[1]
Accrued compensation	580	1,274	[1]
Other accrued liabilities	1,513	1,805	[1]
Current portion of notes payable	50	0	[1]
Warrant liability	7,155	2,276	[1]
Total current liabilities	12,731	8,383	[1]
Non-current portion of notes payable	9,496	9,453	[1]
Non-current portion of deferred rent	3	13	[1]
Commitments			[1]
Stockholders' equity:
Common stock	5	5	[1]
Additional paid-in capital	429,742	429,142	[1]
Accumulated other comprehensive income	8	19	[1]
Accumulated deficit	(415,070)	(401,146)	[1]
Total stockholders' equity	14,685	28,020	[1]
Total liabilities and stockholders' equity	$ 36,915	$ 45,869	[1]

[1] The condensed consolidated balance sheet as of December 31, 2011 has been derived from the audited financial statements as of that date included in the Company's Annual Report on Form 10-K for the year ended December 31, 2011.