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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net loss $ (1,295,455) $ (1,223,081)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 32,744 35,101
Stock-based compensation expense 51,354 321,420
Changes in assets and liabilities:    
Grant funds receivable 140,909 230,498
Prepaid expenses and other current assets 14,408 13,618
Accounts payable and accrued expenses (74,855) (175,422)
Total adjustments 164,560 425,215
Net cash used in operating activities (1,130,895) (797,866)
Cash flows from investing activities:    
Purchase of property and equipment (11,164)  
Net cash used in investing activities (11,164)  
Cash flows from financing activities:    
Net proceeds from sale of common stock   1,643,334
Net cash provided by financing activities   1,643,334
Net increase (decrease) in cash and cash equivalents (1,142,059) 845,468
Cash and cash equivalents at beginning of period 2,513,861 1,035,925
Cash and cash equivalents at end of period $ 1,371,802 $ 1,881,393