Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended		147 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013
Cash flows from operating activities:
Net loss	$ (1,413,229)	$ (1,525,055)	$ (26,180,371)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	52,652	70,232	711,932
Accretion of preferred stock redemption value			346,673
Stock-based compensation expense	116,600	247,318	6,634,289
Investor warrant modification expense	238,169		390,295
Changes in assets and liabilities:
Grant funds receivable	241,234	(65,020)	(25,014)
Prepaid expenses and other current assets	(5,961)	(17,204)	(48,262)
Deposits and other assets			(11,010)
Accounts payable and accrued expenses	(101,505)	(603,624)	314,320
Total adjustments	541,189	(368,298)	8,313,223
Net cash used in operating activities	(872,040)	(1,893,353)	(17,867,148)
Cash flows from investing activities:
Purchase of property and equipment	(86,602)		(625,092)
Proceeds from sale of property and equipment			5,580
Net cash used in investing activities	(86,602)		(619,512)
Cash flows from financing activities:
Net proceeds from sale of common stock	1,643,333	310,160	17,479,801
Net proceeds from sale of preferred stock		1,999,032	2,727,475
Net cash provided by financing activities	1,643,333	2,309,192	20,207,276
Net increase in cash and cash equivalents	684,691	415,839	1,720,616
Cash and cash equivalents at beginning of period	1,035,925	1,167,980
Cash and cash equivalents at end of period	1,720,616	1,583,819	1,720,616
Supplemental disclosure of cash flow information:
Interest paid			$ 5,669