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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net loss $ (2,689,287) $ (2,733,555) $ (2,284,943)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 28,935 69,037 78,862
Stock-based compensation expense, including common stock issued for services 67,905 479,103 402,104
Changes in assets and liabilities:      
Grant funds receivable (40,637) 61,568 125,339
Prepaid expenses and other current assets (12,146) (934) (1,268)
Accounts payable and accrued expenses (60,033) (125,326) (14,686)
Total adjustments (15,976) 483,448 590,351
Net cash used in operating activities (2,705,263) (2,250,107) (1,694,592)
Cash flows from investing activities:      
Purchase of property and equipment (15,850) (35,503) (86,603)
Net cash used in investing activities $ (15,850) (35,503) (86,603)
Cash flows from financing activities:      
Proceeds from sale of common stock $ 873,400 1,643,333
Proceeds from sale of preferred stock $ 2,679,810 1,615,798
Net cash provided in financing activities 2,679,810 $ 873,400 3,259,131
Net increase (decrease) in cash and cash equivalents (41,303) (1,412,210) 1,477,936
Cash and cash equivalents at beginning of period 1,101,651 2,513,861 1,035,925
Cash and cash equivalents at end of period $ 1,060,348 $ 1,101,651 $ 2,513,861