Stock-Based Compensation (Details Textual) (USD $)					9 Months Ended		3 Months Ended		9 Months Ended			12 Months Ended	9 Months Ended		12 Months Ended	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2013 Employees And Directors [Member]	Sep. 30, 2012 Employees And Consultants [Member]	Sep. 30, 2013 Employees And Consultants [Member] General and Administrative Expenses and Research and Development Expense [Member]	Sep. 30, 2012 Employees And Consultants [Member] General and Administrative Expenses and Research and Development Expense [Member]	Sep. 30, 2013 Employees And Consultants [Member] General and Administrative Expenses and Research and Development Expense [Member]	Sep. 30, 2012 Employees And Consultants [Member] General and Administrative Expenses and Research and Development Expense [Member]	Sep. 30, 2013 2001 Stock Plan [Member]	Dec. 31, 2001 2001 Stock Plan [Member] Maximum [Member]	Sep. 30, 2013 2007 Stock Plan [Member]	Mar. 20, 2007 2007 Stock Plan [Member]	Dec. 31, 2007 2007 Stock Plan [Member] Maximum [Member]	Sep. 30, 2013 2010 Stock Plan [Member]	Nov. 02, 2010 2010 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	3,804,580	4,453,746	4,258,746	2,979,010							953,507		443,573	2,500,000		2,407,500	3,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross					117,500	1,840,000					953,507	250,000	443,573		250,000	2,407,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value					$ 185,000	$ 4,000,000
Allocated Share-based Compensation Expense							338,000	395,000	1,200,000	1,300,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options	$ 1,900,000