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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended 153 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Cash flows from operating activities:      
Net loss $ (615,918) $ (696,797) $ (27,668,003)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 16,372 17,550 754,514
Accretion of preferred stock redemption value     346,673
Stock-based compensation expense 26,307 265,825 7,187,016
Changes in assets and liabilities:      
Grant funds receivable 140,909 52,434  
Prepaid expenses and other current assets 5,801 (6,248) (37,768)
Deposits and other assets     (11,010)
Accounts payable and accrued expenses (77,006) 22,747 235,343
Total adjustments 112,383 352,308 8,474,768
Net cash used in operating activities (503,535) (344,489) (19,193,235)
Cash flows from investing activities:      
Purchase of property and equipment     (625,093)
Proceeds from sale of property and equipment     5,580
Net cash used in investing activities     (619,513)
Cash flows from financing activities:      
Net proceeds from sale of common stock   1,060,000 17,479,801
Net proceeds from sale of preferred stock     4,343,273
Net cash provided by financing activities   1,060,000 21,823,074
Net increase (decrease) in cash and cash equivalents (503,535) 715,511 2,010,326
Cash and cash equivalents at beginning of period 2,513,861 1,035,925  
Cash and cash equivalents at end of period 2,010,326 1,751,436 2,010,326
Supplemental disclosure of cash flow information:      
Interest paid     $ 5,669