Series C Convertible Preferred Stock (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Summary of Series C Preferred Stock activity
Preferred stock principal paid in common stock, Shares	600,309
Preferred stock principal paid in common stock, Amount	$ (7,780)
Series C Preferred Stock [Member]
Summary of Series C Preferred Stock activity
Balance at December 31, 2011, Shares	5,444
Balance at December 31, 2011, Amount	50,098
Preferred stock principal paid in cash, Shares	(1,556)
Preferred stock principal paid in cash, Amount	(15,560)
Preferred stock principal paid in common stock, Shares	(778)
Preferred stock principal paid in common stock, Amount	(7,780)
Preferred stock accretion of fees and embedded derivative, Amount	2,875
Balance at September 30, 2012, Shares	3,110
Balance at September 30, 2012, Amount	$ 29,633