Nature of Business (Details) (USD $)	9 Months Ended		12 Months Ended
	Sep. 30, 2013 Grant Segments	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Nature Of Business Textual [Abstract]
Number of active business segments	2
Number of active grants	4
Cash and cash equivalents	$ 6,582,556	$ 3,698,398	$ 3,356,380	$ 5,996,668
Net increase in cash and cash equivalents	3,226,176	(2,298,270)
Percentage increase in cash and cash equivalents	96.00%
Working capital, carrying value	5,672,312
Warrant liability	9,975,899		2,682,383
Increase in working capital	2,989,929
Percentage increase in working capital	111.00%
Net proceeds received from public offering	6,216,762
Net cash used in operating activities	(3,164,333)	(2,293,515)
Increase in net cash used in provided by operating activities	870,818
Percentage decrease in net cash used in provided by operating activities	38.00%
Active grant funding available	34,600,000
Proceeds from net operating losses			$ 521,458