Series C Convertible Preferred Stock (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Summary of Series C Preferred Stock activity
Preferred stock principal paid in common stock, Shares	603,931
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	(778)
Preferred stock principal paid in cash, Amount	(7,780)
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	2,093
Balance at June 30, 2012, Shares	3,888
Balance at June 30, 2012, Amount	$ 36,631