Financing (Details 8) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Debt Conversion [Line Items]
Gain from change in fair value of derivative liability - warrants	$ 373	$ 3,166
Series D Convertible Preferred Stock [Member]
Debt Conversion [Line Items]
Gain from change in fair value of derivative liability - warrants	66	71
Warrants With Debenture Attached Series 2008 [Member]
Debt Conversion [Line Items]
Gain from change in fair value of derivative liability - warrants	177	1,409
Warrants With Debenture Attached Series 2010 [Member]
Debt Conversion [Line Items]
Gain from change in fair value of derivative liability - warrants	61	1,080
Warrants With Debenture Attached Series 2011 [Member]
Debt Conversion [Line Items]
Gain from change in fair value of derivative liability - warrants	43	385
Warrants With Debenture Attached Series 2012 [Member]
Debt Conversion [Line Items]
Gain from change in fair value of derivative liability - warrants	$ 26	$ 221