Consolidated Balance Sheets - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 11,342,794	$ 5,420,708
Contracts and grants receivable	394,402	1,018,835
Research and development incentives receivable	312,378	444,043
Prepaid expenses and other current assets	680,088	609,739
Total current assets	12,729,662	7,493,325
Security deposit	22,757	22,757
Office furniture and equipment, net	27,511	36,093
Deferred issuance cost	57,884	39,324
Intangible assets, net		19,699
Right-of-use lease assets	259,837	125,412
Research and development incentives receivable	125,303
Other assets	27,124	38,750
Total assets	13,250,078	7,775,360
Current liabilities:
Accounts payable	2,444,919	2,735,442
Accrued expenses	2,647,224	3,157,386
Accrued compensation	74,028	298,173
Paycheck Protection Program loan	255,341
Lease liabilities - current	114,392	121,075
Total current liabilities	5,535,904	6,312,076
Non-current liabilities:
Paycheck Protection Program loan, net of current	162,489
Lease liabilities, net of current	146,214	6,149
Total liabilities	5,844,607	6,318,225
Commitments and contingencies
Shareholders' equity:
Preferred stock, 350,000 shares authorized, none issued or outstanding
Common stock, $.001 par value; 50,000,000 shares authorized; 29,847,288 shares and 21,753,124 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	29,847	21,753
Additional paid-in capital	195,058,736	177,006,004
Accumulated other comprehensive loss	(9,243)	(45,010)
Accumulated deficit	(187,673,869)	(175,525,612)
Total shareholders’ equity	7,405,471	1,457,135
Total liabilities and shareholders’ equity	$ 13,250,078	$ 7,775,360