Nature of Operations (Detail Textuals) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Organization, Consolidation and Presentation Of Financial Statements [Abstract]
Net loss	$ (8,576,379)	$ (6,583,102)	$ (31,900,000)	$ (27,500,000)	$ (47,000,000)
Accumulated deficit	(795,222,645)		(786,646,266)
Net cash used in operating activities	(5,933,416)	(3,475,739)
Cash and cash equivalents	4,502,838	20,829,033	9,380,059	13,856,893	10,955,403	14,580,983
Net working capital	7,900,000		6,900,000
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