Nature of Operations (Detail Textuals) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Liquidity Disclosure [Line Items]
Net Loss	$ (9,320,764)	$ (6,479,554)	$ (17,897,143)	$ (13,062,656)	$ 31,900,000	$ 27,500,000	$ 47,000,000
Accumulated deficit	(804,560,712)		(804,560,712)		(786,646,266)
Net cash used in operating activities			(10,932,997)	(8,406,750)
Cash and cash equivalents	7,410,948	15,851,417	7,410,948	15,851,417	9,380,059	13,856,893
Net working capital	11,100,000		11,100,000		6,900,000
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			15,000,000
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			$ 20,000,000