Consolidated Balance Sheets (USD $)	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 4,431,288	$ 5,996,668
Grants receivable	239,599	362,473
Other receivable		574,157
Prepaid expenses	249,978	195,762
Total current assets	4,920,865	7,129,060
Office furniture and equipment, net	16,223	15,032
Intangible assets, net	974,377	1,079,566
Total assets	5,911,465	8,223,658
Current liabilities:
Accounts payable	1,219,568	1,303,555
Accrued compensation	71,486	129,061
Total current liabilities	1,291,054	1,432,616
Commitments and contingencies
Shareholders’ equity:
Preferred stock; 250,000 shares authorized; none issued or outstanding
Common stock, $.001 par value; 50,000,000 shares and 20,000,000 in 2011 authorized; 11,132,544 shares and 11,105,532 shares issued and outstanding in 2012 and 2011, respectively	11,133	11,106
Additional paid-in capital	125,145,284	124,897,309
Accumulated deficit	(120,536,006)	(118,117,373)
Total shareholders’ equity	4,620,411	6,791,042
Total liabilities and shareholders’ equity	$ 5,911,465	$ 8,223,658