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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net loss $ (1,996,556) $ (1,809,970)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 21,701 50,003
Stock-based compensation expense, including common stock issued for services 50,516 165,638
Changes in assets and liabilities:    
Grant funds receivable 79,341 140,909
Prepaid expenses and other current assets (30,773) (20,631)
Accounts payable and accrued expenses (68,802) (142,116)
Total adjustments 51,983 193,803
Net cash used in operating activities (1,944,573) (1,616,167)
Cash flows from investing activities:    
Purchase of property and equipment (15,850) (35,503)
Net cash used in investing activities (15,850) $ (35,503)
Cash flows from financing activities:    
Net proceeds from sale of preferred stock 2,679,809
Net cash provided by financing activities 2,679,809
Net increase (decrease) in cash and cash equivalents 719,386 $ (1,651,670)
Cash and cash equivalents at beginning of period 1,101,651 2,513,861
Cash and cash equivalents at end of period $ 1,821,037 $ 862,191