Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 6,582,556	$ 3,356,380
Grants receivable	161,835	339,308
Prepaid expenses	198,060	140,693
Total current assets	6,942,451	3,836,381
Office furniture and equipment, net	18,830	12,995
Intangible assets, net	688,766	855,728
Total assets	7,650,047	4,705,104
Current liabilities:
Accounts payable	1,214,585	1,124,503
Warrant liability	9,975,899
Accrued compensation	55,554	29,495
Total current liabilities	11,246,038	1,153,998
Shareholders' equity (deficiency):
Preferred stock; 350,000 shares authorized; none issued or outstanding
Common stock, $.001 par value; 50,000,000 shares authorized; 19,152,630 shares and 11,168,905 shares issued and outstanding in 2013 and 2012, respectively	19,152	11,169
Additional paid-in capital	129,717,665	125,820,318
Accumulated deficit	(133,332,808)	(122,280,381)
Total shareholders' equity (deficiency)	(3,595,991)	3,551,106
Total liabilities and shareholders' equity (deficiency)	$ 7,650,047	$ 4,705,104