Consolidated Balance Sheets - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 11,720,085	$ 7,809,487
Contract and grants receivable	998,609	926,251
Prepaid expenses	420,963	263,254
Income tax receivable		416,810
Total current assets	13,139,657	9,415,802
Security deposit	22,734	22,734
Office furniture and equipment, net	25,993	37,163
Deferred issuance costs	47,352
Intangible assets, net	53,653	73,952
Total assets	13,289,389	9,549,651
Current liabilities:
Accounts payable	1,713,632	1,753,614
Accrued expenses	1,984,407	1,143,306
Deferred revenue	259,862
Accrued compensation	63,019	333,019
Total current liabilities	4,020,920	3,229,939
Commitments and contingencies
Shareholders' equity:
Preferred stock, 350,000 shares authorized; none issued or outstanding
Common stock, $.001 par value; 50,000,000 and 25,000,000 shares authorized at September 30, 2018 and December 31, 2017, respectively; 17,682,839 shares and 8,730,640 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	17,683	8,731
Additional paid-in capital	172,317,754	163,581,026
Accumulated other comprehensive loss	(1,767)
Accumulated deficit	(163,065,201)	(157,270,045)
Total shareholders' equity	9,268,469	6,319,712
Total liabilities and shareholders' equity	$ 13,289,389	$ 9,549,651