Nature of Operations (Detail Textuals) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Liquidity Disclosure [Line Items]
Accumulated deficit	$ (786,646,266)	$ (754,783,812)
Net cash used in operating activities	(20,164,996)	(33,310,067)	(40,770,469)
Cash and cash equivalents	9,380,059	13,856,893	10,955,403	14,580,983
Net working capital	6,900,000	22,500,000
Maximum
Liquidity Disclosure [Line Items]
Reduction in annual expenses as a result of restructuring	4,000,000
Expected operating cash burn for fiscal year 2013	15,000,000
Minimum
Liquidity Disclosure [Line Items]
Reduction in annual expenses as a result of restructuring	3,000,000
Expected operating cash burn for fiscal year 2013	$ 10,000,000