Consolidated Balance Sheets - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 4,244,871	$ 7,809,487
Contract and grants receivable	1,530,735	926,251
Prepaid expenses	122,898	263,254
Income tax receivable		416,810
Total current assets	5,898,504	9,415,802
Security deposit	22,734	22,734
Office furniture and equipment, net	30,210	37,163
Deferred offering costs	140,246
Intangible assets, net	60,445	73,952
Total assets	6,152,139	9,549,651
Current liabilities:
Accounts payable	1,686,467	1,753,614
Accrued expenses	1,729,905	1,143,306
Deferred revenue	56,692
Accrued compensation	56,116	333,019
Total current liabilities	3,529,180	3,229,939
Commitments and contingencies
Shareholders' equity:
Preferred stock, 350,000 shares authorized; none issued or outstanding
Common stock, $.001 par value; 25,000,000 shares authorized ; 8,750,801 shares and 8,730,640 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively	8,751	8,731
Additional paid-in capital	163,817,801	163,581,026
Accumulated deficit	(161,203,593)	(157,270,045)
Total shareholders' equity	2,622,959	6,319,712
Total liabilities and shareholders' equity	$ 6,152,139	$ 9,549,651