Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 5,012,605	$ 5,525,094
Contracts and grants receivable	345,420us-gaap_GrantsReceivableCurrent	794,767us-gaap_GrantsReceivableCurrent
Prepaid expenses	131,546us-gaap_PrepaidExpenseCurrent	172,928us-gaap_PrepaidExpenseCurrent
Total current assets	5,489,571us-gaap_AssetsCurrent	6,492,789us-gaap_AssetsCurrent
Office furniture and equipment, net	57,176us-gaap_PropertyPlantAndEquipmentNet	51,510us-gaap_PropertyPlantAndEquipmentNet
Intangible assets, net	355,910	409,949
Total assets	5,902,657us-gaap_Assets	6,954,248us-gaap_Assets
Current liabilities:
Accounts payable	2,543,942us-gaap_AccountsPayableCurrent	3,003,545us-gaap_AccountsPayableCurrent
Warrant liability	5,152,367us-gaap_DerivativeLiabilitiesCurrent	3,789,562us-gaap_DerivativeLiabilitiesCurrent
Accrued compensation	32,189	315,030
Total current liabilities	7,728,498us-gaap_LiabilitiesCurrent	7,108,137us-gaap_LiabilitiesCurrent
Commitments and contingencies
Shareholders' deficiency:
Preferred stock; 350,000 shares authorized; none issued or outstanding
Common stock, $.001 par value; 50,000,000 shares authorized; 25,339,364 shares and 23,936,568 shares issued and outstanding at March 31, 2015 and December 31, 2014, respectively	25,340us-gaap_CommonStockValue	23,937us-gaap_CommonStockValue
Additional paid-in capital	141,764,490us-gaap_AdditionalPaidInCapital	138,868,523us-gaap_AdditionalPaidInCapital
Accumulated deficit	(143,615,671)	(139,046,349)
Total shareholders' deficiency	(1,825,841)us-gaap_StockholdersEquity	(153,889)us-gaap_StockholdersEquity
Total liabilities and shareholders' deficiency	$ 5,902,657	$ 6,954,248

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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