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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net loss $ (2,170,162) $ (3,271,701) $ (2,689,287)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 28,027 28,780 28,935
Stock-based compensation expense 57,224 967,667 67,905
Changes in assets and liabilities:      
Grant funds receivable (31,684) 91,904 (40,637)
Prepaid expenses and other current assets (13,314) (5,626) (12,146)
Accounts payable and accrued expenses 441,445 242,857 (60,033)
Total adjustments 481,698 1,325,582 (15,976)
Net cash used in operating activities (1,688,464) (1,946,119) (2,705,263)
Cash flows from investing activities:      
Purchase of property and equipment (4,350) (15,850)
Net cash used in investing activities (4,350) (15,850)
Cash flows from financing activities:      
Net proceeds from sale of preferred stock 980,000 2,679,810
Net proceeds from sale of common stock 571,511 1,339,801
Net cash provided in financing activities 1,551,511 1,339,801 2,679,810
Net decrease in cash and cash equivalents (141,303) (606,318) (41,303)
Cash and cash equivalents at beginning of period 454,030 1,060,348 1,101,651
Cash and cash equivalents at end of period $ 312,727 $ 454,030 $ 1,060,348