Stockholders' Equity - Common and Preferred Shares (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2012	Sep. 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	$ 40	$ 5	$ 2,219
Committed Equity Financing Facility [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	40	5	99
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