Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended		121 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011
Cash flows from operating activities:
Net loss	$ (817,626)	$ (1,623,878)	$ (21,102,802)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	54,184	71,498	510,804
Accretion of preferred stock redemption value			346,673
Stock-based compensation expense	385,164	413,985	5,971,906
Changes in assets and liabilities:
Grant funds receivable	(164,388)	(782,602)	(638,663)
Prepaid expenses and other current assets	7,813	(177,386)	(41,017)
Deposits and other assets		(11,010)	(11,990)
Accounts payable and accrued expenses	209,004	741,932	819,402
Total adjustments	491,777	256,417	6,957,115
Net cash used in operating activities	(325,849)	(1,367,461)	(14,145,687)
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	(85,183)	(340,676)	(515,585)
Net cash provided (used) by financing activities	(85,183)	(340,676)	15,334,756
Net increase (decrease) in cash and cash equivalents	(411,032)	(1,708,137)	668,055
Cash and cash equivalents at beginning of period	1,079,087	3,515,784
Cash and cash equivalents at end of period	668,055	1,807,647	668,055
Supplemental disclosure of cash flow information:
Interest paid			$ 5,669