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Consolidated Balance Sheets (USD $)
Mar. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 5,606,850 $ 5,856,242
Contracts and grants receivable 694,346 867,086
Taxes receivable    750,356
Prepaid expenses 97,620 135,391
Total current assets 6,398,816 7,609,075
Office furniture and equipment, net 36,357 23,868
Intangible assets, net 577,800 632,512
Total assets 7,012,973 8,265,455
Current liabilities:    
Accounts payable 1,552,629 1,520,290
Warrant liability 9,521,312 8,281,247
Accrued compensation 45,309 233,739
Total current liabilities 11,119,250 10,035,276
Shareholders' equity (deficiency):    
Preferred stock; 350,000 shares authorized; none issued or outstanding      
Common stock, $.001 par value; 50,000,000 shares authorized; 19,852,260 shares and 19,626,439 shares issued and outstanding at March 31, 2014 and December 31, 2013, respectively 19,852 19,626
Additional paid-in capital 131,544,956 130,549,930
Accumulated deficit (135,671,085) (132,339,377)
Total shareholders' deficiency (4,106,277) (1,769,821)
Total liabilities and shareholders' equity deficiency $ 7,012,973 $ 8,265,455