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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended 126 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Cash flows from operating activities:        
Net loss $ (2,346,826) $ (2,747,328) $ (3,284,252) $ (22,632,002)
Adjustments to reconcile net loss to net cash used in operating activities:        
Depreciation and amortization 109,017 119,773 89,776 565,637
Accretion of preferred stock redemption value       346,673
Stock-based compensation expense 772,997 750,532 1,298,665 6,359,739
Write-off of deferred offering costs 430,402     430,402
Changes in assets and liabilities:        
Grant funds receivable 290,760 (153,954) (8,953) (183,515)
Prepaid expenses and other current assets 19,122 (4,215) 254,671 (29,708)
Deposits 980 (11,010)   (11,010)
Accounts payable and accrued expenses 419,927 39,033 224,943 1,030,325
Total adjustments 2,043,205 740,159 1,859,102 8,508,543
Net cash used in operating activities (303,621) (2,007,169) (1,425,150) (14,123,459)
Cash flows from investing activities:        
Purchase of property and equipment (11,896) (4,706) (270,246) (538,490)
Proceeds from sale of property and equipment   5,580   5,580
Net cash provided (used) by investing activities (11,896) 874 (270,246) (532,910)
Cash flows from financing activities:        
Proceeds from sale of common stock 404,410   3,020,000 15,526,308
Proceeds from sale of preferred stock       728,443
Deferred offering costs   (430,402)   (430,402)
Net cash provided by financing activities 404,410 (430,402) 3,020,000 15,824,349
Net increase (decrease) in cash and cash equivalents 88,893 [1] (2,436,697) [1] 1,324,604 [1] 1,167,980 [1]
Cash and cash equivalents at beginning of period 1,079,087 3,515,784 2,191,180  
Cash and cash equivalents at end of period 1,167,980 1,079,087 3,515,784 1,167,980
Supplemental disclosure of cash flow information        
Interest paid       $ 5,669
[1] Supplemental disclosure of non-cash investing and financing activities: In connection with the Merger discussed in Note 5, all of the outstanding shares of the Company's mandatory redeemable convertible preferred stock were converted into shares of common stock as of September 28, 2006.