Financing (Details 8) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Debt Conversion [Line Items]
Adjustment for change in fair value of derivative liability- warrants	$ 3,003	$ 11,347
Series D Preferred Stock [Member]
Debt Conversion [Line Items]
Adjustment for change in fair value of derivative liability- warrants	588	1,826
Warrants With Debenture Attached Series 2007 [Member]
Debt Conversion [Line Items]
Adjustment for change in fair value of derivative liability- warrants	0	1,510
Warrants With Debenture Attached Series 2008 [Member]
Debt Conversion [Line Items]
Adjustment for change in fair value of derivative liability- warrants	1,366	5,185
Warrants With Debenture Attached Series 2010 [Member]
Debt Conversion [Line Items]
Adjustment for change in fair value of derivative liability- warrants	457	1,764
Warrants With Debenture Attached Series 2011 [Member]
Debt Conversion [Line Items]
Adjustment for change in fair value of derivative liability- warrants	378	1,233
Warrants With Debenture Attached Series 2012 [Member]
Debt Conversion [Line Items]
Adjustment for change in fair value of derivative liability- warrants	$ 214	$ (171)