CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 16,916,696	$ 17,988,590
Marketable securities	15,067,770	18,057,672
Receivable	3,379	175,704
Interest receivable	11,555	41,275
Prepaid expenses and other current assets	800,481	1,017,799
Total current assets	32,799,881	37,281,040
Equipment and furnishings, net	267,432	266,335
Goodwill	183,780	183,780
Other assets	129,566	123,268
Total assets	33,380,659	37,854,423
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	2,609,267	2,074,463
Accrued expenses and other current liabilities	5,703,486	4,786,956
Warrant liabilities	10,627,100	6,738,934
Total current liabilities	18,939,853	13,600,353
Commitment and contingencies
Stockholders' equity:
Preferred Stock, $.01 par value, 5,000,000 shares authorized, including 25,000 shares of Series A Junior Participating Preferred Stock; no shares issued and outstanding	0	0
Common stock, $.001 par value, 250,000,000 shares authorized; 149,060,885 shares issued and outstanding at each of March 31, 2012 and December 31, 2011	149,057	149,057
Additional paid-in capital	237,646,160	237,324,545
Treasury stock, at cost (633,816 shares)	(2,279,238)	(2,279,238)
Accumulated deficit	(221,075,173)	(210,940,294)
Total stockholders' equity	14,440,806	24,254,070
Total liabilities and stockholders' equity	$ 33,380,659	$ 37,854,423