Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended		135 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012
Cash flows from operating activities:
Net loss	$ (1,525,055)	$ (1,193,478)	$ (24,157,057)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	70,232	81,277	635,869
Accretion of preferred stock redemption value			346,673
Stock-based compensation expense	247,318	519,747	6,607,057
Changes in assets and liabilities:
Grant funds receivable	(65,020)	49,361	(248,535)
Prepaid expenses and other current assets	(17,204)	36,405	(46,912)
Deferred offering costs		(134,194)
Deposits and other assets			(11,010)
Accounts payable and accrued expenses	(603,624)	128,452	426,701
Total adjustments	(368,298)	681,048	7,709,843
Net cash used in operating activities	(1,893,353)	(512,430)	(16,447,214)
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	415,839	(512,430)	1,583,819
Cash and cash equivalents at beginning of period	1,167,980	1,079,087
Cash and cash equivalents at end of period	1,583,819	566,657	1,583,819
Supplemental disclosure of cash flow information:
Interest paid			$ 5,669