Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities:
Net loss	$ (3,933,548)	$ (4,045,035)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization and depreciation	22,384	39,671
Share-based compensation	198,395	240,674
Issuance of common stock for services		5,925
Change in operating assets and liabilities:
Contract and grants receivable	(604,484)	491,884
Income tax receivable	416,810
Prepaid expenses	140,356	5,356
Accounts payable and accrued expenses	379,206	579,756
Accrued compensation	(276,903)	(297,904)
Deferred revenue	56,692
Total adjustments	332,456	1,065,362
Net cash used in operating activities	(3,601,092)	(2,979,673)
Investing activities:
Purchases of office furniture and equipment	(1,924)	(2,131)
Net cash used in investing activities	(1,924)	(2,131)
Financing activities:
Proceeds from issuance of common stock pursuant to the equity line	38,400	23,100
Net cash provided by financing activities	38,400	23,100
Net decrease in cash and cash equivalents	(3,564,616)	(2,958,704)
Cash and cash equivalents at beginning of period	7,809,487	8,772,567
Cash and cash equivalents at end of period	4,244,871	5,813,863
Supplemental disclosure of non cash financing activity:
Accrued deferred issuance costs	$ 140,246