Consolidated Balance Sheets - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 11,168,305	$ 5,420,708
Contracts and grants receivable	334,787	1,018,835
Research and development incentives receivable	299,749	444,043
Prepaid expenses and other current assets	174,482	609,739
Total current assets	11,977,323	7,493,325
Security deposit	22,757	22,757
Office furniture and equipment, net	32,846	36,093
Deferred issuance costs	39,715	39,324
Intangible assets, net	6,117	19,699
Right-of-use lease assets	55,393	125,412
Research and development incentives receivable	95,525
Other assets	30,998	38,750
Total assets	12,260,674	7,775,360
Current liabilities:
Accounts payable	2,521,494	2,735,442
Accrued expenses	3,157,532	3,157,386
Accrued compensation	76,660	298,173
Paycheck Protection Program loan	185,702
Lease liabilities - current	54,455	121,075
Total current liabilities	5,995,843	6,312,076
Non-current liabilities:
Paycheck Protection Program loan, net of current	232,128
Lease liabilities, net of current	2,101	6,149
Total liabilities	6,230,072	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; 28,591,432 shares and 21,753,124 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively	28,591	21,753
Additional paid-in capital	191,922,671	177,006,004
Accumulated other comprehensive loss	(36,951)	(45,010)
Accumulated deficit	(185,883,709)	(175,525,612)
Total shareholders’ equity	6,030,602	1,457,135
Total liabilities and shareholders’ equity	$ 12,260,674	$ 7,775,360