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Consolidated Balance Sheets (USD $)
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Current assets:      
Cash and cash equivalents $ 4,209,949 $ 5,856,242 $ 3,356,380
Contracts and grants receivable 1,338,043 867,086 339,308
Taxes receivable    750,356   
Prepaid expenses 205,507 135,391 140,693
Total current assets 5,753,499 7,609,075 3,836,381
Office furniture and equipment, net 53,229 23,868 12,995
Intangible assets, net 466,214 632,512 855,728
Total assets 6,272,942 8,265,455 4,705,104
Current liabilities:      
Accounts payable 3,059,325 1,520,290 1,124,503
Warrant liability 7,429,460 8,281,247   
Accrued compensation 59,983 233,739 29,495
Total current liabilities 10,548,768 10,035,276 1,153,998
Commitments and contingencies         
Shareholders' equity (deficiency):      
Preferred stock; 350,000 shares authorized; none issued or outstanding         
Common stock, $.001 par value; 50,000,000 shares authorized in September 2014, Dec 2013 and 2012, respectively; 22,050,038 shares,19,626,439 shares and 11,168,905 shares issued and outstanding September 2014, Dec 2013 and 2012, respectively 22,050 19,626 11,169
Additional paid-in capital 136,671,281 130,549,930 125,820,318
Accumulated deficit (140,969,157) (132,339,377) (122,280,381)
Total shareholders' equity (deficiency) (4,275,826) (1,769,821) 3,551,106
Total liabilities and shareholders' equity (deficiency) $ 6,272,942 $ 8,265,455 $ 4,705,104