CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 6,397	$ 5,891
Grant receivable		234
Prepaid expenses and other current assets	104	70
Total current assets	6,501	6,195
Property and equipment, net	6	7
Restricted cash	69	59
Intangible assets, net	36	39
Total assets	6,612	6,300
Current liabilities:
Accounts payable	384	125
Accrued expenses	1,551	537
Accrued dividends payable	80	48
Deferred revenue	200	200
Warrant liabilities		861
Total current liabilities	2,215	1,771
Other long-term liabilities		12
Total liabilities	2,215	1,783
Commitments and contingencies (Note 11)
Stockholders' deficit:
Undesignated stock, $0.01 par value; 20,000,000 shares authorized at December 31, 2011 and 2010, 8,001,000 shares designated at December 31, 2011 and 2010
Series A 12% convertible preferred stock; 5,000,000 shares authorized, 1,562,500 and 1,592,500 issued and outstanding at December 31, 2011 and 2010, respectively	632	644
Common stock, $0.001 par value; 50,000,000 shares authorized at December 31, 2011 and 2010, 12,919,538 and 10,651,535 issued and outstanding at December 31, 2011 and 2010, respectively	13	11
Additional paid-in capital	66,367	54,075
Deficit accumulated during the development stage	(69,137)	(56,424)
Total stockholders' deficit	(2,125)	(1,694)
Total liabilities, redeemable convertible preferred stock and stockholders' deficit	6,612	6,300
Series B-1 12% Redeemable Convertible Preferred Stock
Stockholders' deficit:
Convertible preferred stock, value	1,681	1,664
Series B-2 12% redeemable convertible preferred stock
Stockholders' deficit:
Convertible preferred stock, value	2,687	2,474
Series C super dividend convertible preferred stock
Stockholders' deficit:
Convertible preferred stock, value	$ 2,154	$ 2,073