Stock-Based Compensation (Details Textual) (USD $)				12 Months Ended		3 Months Ended					12 Months Ended		3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2001 2001 Stock Plan [Member]	Mar. 31, 2013 2001 Stock Plan [Member]	Mar. 31, 2013 Employees And Directors [Member]	Mar. 31, 2012 Employees And Consultants [Member]	Mar. 31, 2013 Employees And Consultants [Member] General and Administrative Expenses and Research and Development Expense [Member]	Mar. 31, 2012 Employees And Consultants [Member] General and Administrative Expenses and Research and Development Expense [Member]	Mar. 31, 2013 2007 Stock Plan [Member]	Dec. 31, 2007 2007 Stock Plan [Member]	Mar. 20, 2007 2007 Stock Plan [Member]	Mar. 31, 2013 2010 Stock Plan [Member]	Nov. 02, 2010 2010 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	4,221,247	4,453,746	2,979,010		953,507					660,240		2,500,000	2,607,500	3,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				250,000		117,500	1,300,000			660,240	250,000		2,607,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value						$ 185,000	$ 3,000,000
Allocated Share-based Compensation Expense								457,000	508,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options	$ 2,900,000