Stockholders' Equity - Common and Preferred Shares (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Summary of the gain (loss) from the change in fair value of warrants and other financial instruments
Total gain (loss) on change in fair market value of derivatives	$ 4	$ (31)	$ 5	$ 2,179
Committed Equity Financing Facility Warrants [Member]
Summary of the gain (loss) from the change in fair value of warrants and other financial instruments
Total gain (loss) on change in fair market value of derivatives				3
Direct Registration Warrants [Member]
Summary of the gain (loss) from the change in fair value of warrants and other financial instruments
Total gain (loss) on change in fair market value of derivatives	4	(31)	5	59
Gain recognized in connection with Warrant Exchange agreements [Member]
Summary of the gain (loss) from the change in fair value of warrants and other financial instruments
Total gain (loss) on change in fair market value of derivatives				690
Private Placement Warrants [Member]
Summary of the gain (loss) from the change in fair value of warrants and other financial instruments
Total gain (loss) on change in fair market value of derivatives				$ 1,427