Employee Stock Purchase Plan (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Stock Purchase Plan [Line Items]
Allocated Share-based Compensation Expense	$ 4	$ 41
Employee Stock [Member]
Employee Stock Purchase Plan [Line Items]
Allocated Share-based Compensation Expense	(4)	29	66
Employee Stock [Member] | General and Administrative Expense [Member]
Employee Stock Purchase Plan [Line Items]
Allocated Share-based Compensation Expense	(1)	12	30
Employee Stock [Member] | Research and Development Expense [Member]
Employee Stock Purchase Plan [Line Items]
Allocated Share-based Compensation Expense	$ (3)	$ 17	$ 36