Consolidated Balance Sheets - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 13,359,615	$ 26,043,897
Contracts and grants receivable	115,130	138,889
Research and development incentives receivable, current	104,198	103,832
Prepaid expenses and other current assets	274,209	282,903
Total current assets	13,853,152	26,569,521
Security deposit	22,777	22,777
Office furniture and equipment, net of accumulated depreciation of $114,766 and $167,848	18,481	22,220
Deferred issuance cost	20,206	20,266
Right-of-use lease assets	340,987	106,155
Research and development incentives receivable, net of current portion	24,114	121,238
Other assets		7,750
Total assets	14,279,717	26,869,927
Current liabilities:
Accounts payable	3,865,796	2,925,544
Accrued expenses	2,307,746	2,956,545
Accrued compensation	336,692	302,936
Lease liabilities, current	108,948	106,151
Convertible debt, net of debt discount of $102,309	9,897,691
Total current liabilities	16,516,873	6,291,176
Non-current liabilities:
Convertible debt, net of debt discount of $143,847	0	9,856,153
Lease liabilities, net of current portion	233,627
Total liabilities	16,750,500	16,147,329
Commitments and contingencies
Series D Preferred stock, $.001 par value; 50,000 shares authorized, none issued or outstanding as of December 31, 2022, subject to possible redemption at redemption value; liquidation value is $43	43
Shareholders' equity:
Preferred stock, 300,000 and 350,000 shares authorized as of December 31, 2022 and December 31, 2021, respectively; none issued or outstanding
Common stock, $.001 par value; 75,000,000 shares authorized; 2,908,578 shares and 2,858,244 shares issued and outstanding at December 31, 2022 and December 31, 2021, respectively	2,909	2,859
Additional paid-in capital	217,064,964	216,442,904
Accumulated other comprehensive income	24,747	41,942
Accumulated deficit	(219,563,446)	(205,765,107)
Total shareholders' equity (deficit)	(2,470,826)	10,722,598
Total liabilities, mezzanine equity and shareholders' equity	$ 14,279,717	$ 26,869,927

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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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).