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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended 132 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Cash flows from operating activities:      
Net loss $ (1,228,276) $ (817,626) $ (23,860,278)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 46,822 54,184 612,459
Accretion of preferred stock redemption value     346,673
Stock-based compensation expense 162,576 385,164 6,522,315
Changes in assets and liabilities:      
Grant funds receivable (68,276) (164,388) (251,791)
Prepaid expenses and other current assets (11,458) 7,813 (41,166)
Deferred offering costs   (85,183)  
Deposits and other assets     (11,010)
Accounts payable and accrued expenses (561,546) 209,004 468,779
Total adjustments (431,882) 406,594 7,646,259
Net cash used in operating activities (1,660,158) (411,032) (16,214,019)
Cash flows from investing activities:      
Purchase of property and equipment     (538,490)
Proceeds from sale of property and equipment     5,580
Net cash used in investing activities     (532,910)
Cash flows from financing activities:      
Net proceeds from sale of common stock 310,160   15,836,468
Net proceeds from sale of preferred stock 1,999,032   2,727,475
Net cash provided by financing activities 2,309,192   18,563,943
Net increase (decrease) in cash and cash equivalents 649,034 (411,032) 1,817,014
Cash and cash equivalents at beginning of period 1,167,980 1,079,087  
Cash and cash equivalents at end of period 1,817,014 668,055 1,817,014
Supplemental disclosure of cash flow information:      
Interest paid     $ 5,669