Fair Value (Details 2) (Recurring basis, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Total
Derivative liabilities measured at fair value on a recurring basis
Derivative liabilities	$ 79	$ 5,778
(Level 1)
Derivative liabilities measured at fair value on a recurring basis
Derivative liabilities	0	0
(Level 2)
Derivative liabilities measured at fair value on a recurring basis
Derivative liabilities	0	0
(Level 3)
Derivative liabilities measured at fair value on a recurring basis
Derivative liabilities	79	5,778
Conversion feature embedded | Total
Derivative liabilities measured at fair value on a recurring basis
Derivative liabilities	16	1,835
Conversion feature embedded | (Level 1)
Derivative liabilities measured at fair value on a recurring basis
Derivative liabilities	0	0
Conversion feature embedded | (Level 2)
Derivative liabilities measured at fair value on a recurring basis
Derivative liabilities	0	0
Conversion feature embedded | (Level 3)
Derivative liabilities measured at fair value on a recurring basis
Derivative liabilities	16	1,835
2008 Warrants | Total
Derivative liabilities measured at fair value on a recurring basis
Derivative liabilities	0	29
2008 Warrants | (Level 1)
Derivative liabilities measured at fair value on a recurring basis
Derivative liabilities	0	0
2008 Warrants | (Level 2)
Derivative liabilities measured at fair value on a recurring basis
Derivative liabilities	0	0
2008 Warrants | (Level 3)
Derivative liabilities measured at fair value on a recurring basis
Derivative liabilities	0	29
2010 Warrants | Total
Derivative liabilities measured at fair value on a recurring basis
Derivative liabilities	63	3,914
2010 Warrants | (Level 1)
Derivative liabilities measured at fair value on a recurring basis
Derivative liabilities	0	0
2010 Warrants | (Level 2)
Derivative liabilities measured at fair value on a recurring basis
Derivative liabilities	0	0
2010 Warrants | (Level 3)
Derivative liabilities measured at fair value on a recurring basis
Derivative liabilities	$ 63	$ 3,914