Consolidated Balance Sheets - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 6,986,289	$ 8,983,717
Contracts and grants receivable	1,675,545	1,201,715
Prepaid expenses	149,749	157,278
Total current assets	8,811,583	10,342,710
Security deposit	22,734	22,734
Office furniture and equipment, net	12,290	19,634
Deferred issuance costs	74,375	59,761
Intangible assets, net	33,281	46,863
Right-of-use assets	192,200
Other assets	46,500
Total assets	9,192,963	10,491,702
Current liabilities:
Accounts payable	2,451,632	2,126,215
Deferred revenue	69,976
Accrued expenses	2,791,511	1,790,689
Accrued compensation	50,162	294,628
Lease liabilities - current	136,890
Total current liabilities	5,500,171	4,211,532
Non-current liabilities:
Lease liabilities, net of current	56,558
Total liabilities	5,556,729	4,211,532
Shareholders' equity:
Preferred stock, 350,000 shares authorized; none issued or outstanding
Common stock, $.001 par value; 50,000,000 shares authorized; 18,741,210 shares and 17,682,839 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively	18,741	17,683
Additional paid-in capital	173,557,669	172,436,176
Accumulated other comprehensive loss	(7,008)	(3,669)
Accumulated deficit	(169,933,168)	(166,170,020)
Total shareholders' equity	3,636,234	6,280,170
Total liabilities and shareholders' equity	$ 9,192,963	$ 10,491,702