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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended 150 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Cash flows from operating activities:        
Net loss $ (2,284,943) $ (2,135,140) $ (2,346,826) $ (27,052,085)
Adjustments to reconcile net loss to net cash used in operating activities:        
Depreciation and amortization 78,862 93,643 109,017 738,142
Accretion of preferred stock redemption value       346,673
Stock-based compensation expense, including common stock issued for services 402,104 310,076 772,997 7,160,709
Changes in assets and liabilities:        
Grant funds receivable 125,339 (82,733) 290,760 (140,909)
Prepaid expenses and other current assets (1,268) (12,593) 19,122 (43,569)
Deferred offering costs     430,402  
Deposits     980 (11,010)
Accounts payable and accrued expenses (14,686) (614,500) 419,927 312,349
Total adjustments 590,351 (306,107) 2,043,205 8,362,385
Net cash used in operating activities (1,694,592) (2,441,247) (303,621) (18,689,700)
Cash flows from investing activities:        
Purchase of property and equipment (86,603)   (11,896) (625,093)
Proceeds from sale of property and equipment       5,580
Net cash used in investing activities (86,603)   (11,896) (619,513)
Cash flows from financing activities:        
Proceeds from sale of common stock 1,643,333 310,160 404,410 17,479,801
Proceeds from sale of preferred stock 1,615,798 1,999,032   4,343,273
Net cash provided in financing activities 3,259,131 2,309,192 404,410 21,823,074
Net increase (decrease) in cash and cash equivalents 1,477,936 (132,055) 88,893 2,513,861
Cash and cash equivalents at beginning of period 1,035,925 1,167,980 1,079,087  
Cash and cash equivalents at end of period 2,513,861 1,035,925 1,167,980 2,513,861
Supplemental disclosure of cash flow information        
Interest paid       $ 5,669