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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
9 Months Ended124 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Cash flows from operating activities:   
Net loss$ (1,193,478)$ (2,268,544)$ (21,478,654)
Adjustments to reconcile net loss to net cash used in operating activities:   
Depreciation and amortization81,277107,247537,897
Accretion of preferred stock redemption value  346,673
Stock-based compensation expense519,747581,3016,106,489
Changes in assets and liabilities:   
Grant funds receivable49,361(374,673)(424,914)
Prepaid expenses and other current assets36,40528,966(12,425)
Deferred offering costs (260,000) 
Deposits and other assets (11,010)(11,990)
Accounts payable and accrued expenses128,452364,444738,850
Total adjustments815,242436,2757,280,580
Net cash used in operating activities(378,236)(1,832,269)(14,198,074)
Cash flows from investing activities:   
Purchase of property and equipment  (526,594)
Proceeds from sale of property and equipment  5,580
Net cash used in investing activities  (521,014)
Cash flows from financing activities:   
Net proceeds from sale of common stock  15,121,898
Net proceeds from sale of preferred stock  728,443
Costs associated with planned stock offering(134,194)(257,173)(564,596)
Net cash provided (used) by financing activities(134,194)(257,173)15,285,745
Net increase (decrease) in cash and cash equivalents(512,430)(2,089,442)566,657
Cash and cash equivalents at beginning of period1,079,0873,515,784 
Cash and cash equivalents at end of period566,6571,426,342566,657
Supplemental disclosure of cash flow information:   
Interest paid  $ 5,669