CONDENSED BALANCE SHEETS (Unaudited) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 12,453,637	$ 17,988,590
Short-term investments	10,000,000	18,057,672
Receivable	82,899	175,704
Interest receivable	25,605	41,275
Prepaid expenses and other current assets	1,200,084	1,017,799
Total current assets	23,762,225	37,281,040
Equipment and furnishings, net	302,316	266,335
Goodwill	183,780	183,780
Other assets	110,469	123,268
Total assets	24,358,790	37,854,423
Current liabilities:
Accounts payable	2,584,977	2,074,463
Accrued expenses and other current liabilities	5,297,089	4,786,956
Warrant liabilities	12,718,950	6,738,934
Total current liabilities	20,601,016	13,600,353
Stockholders' equity (2011 restated to reflect a 1-for-7 reverse common stock split, see Note 1):
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; 21,307,916 shares issued and outstanding at September 30, 2012 and 21,294,413 shares issued and outstanding at December 31, 2011	21,308	21,294
Additional paid-in capital	238,769,155	237,452,308
Treasury stock	(2,279,238)	(2,279,238)
Accumulated deficit	(232,753,451)	(210,940,294)
Total stockholders' equity	3,757,774	24,254,070
Total liabilities and stockholders' equity	$ 24,358,790	$ 37,854,423