Common Stock And Warrant Sale And Common Stock Purchase Agreements (Details) (USD $)	0 Months Ended		1 Months Ended	0 Months Ended		1 Months Ended	7 Months Ended	12 Months Ended
	Jul. 06, 2011	Aug. 05, 2010	Dec. 29, 2010	Jul. 14, 2010	Oct. 14, 2009	Oct. 21, 2008	Apr. 20, 2010	Dec. 31, 2012
Common Stock And Warrant Sale And Common Stock Purchase Agreements [Abstract]
Shares issued	15,900,000	1,058,201	2,890,173				4,541,497
Warrants issued	7,950,000					8,000,000	5,676,871
Warrant maturity period	5 years				6 years
Shares per warrant	0.5				1.25
Common stock, price per share	$ 1.58	$ 1.89	$ 1.73		$ 2.6423	$ 0.01	$ 3.3029
Fair value of warrants issued	$ 11,614,000					$ 8,600,000	$ 10,200,000
Exercise price of warrant					$ 3.30
Discounted stock, price per share	$ 1.49
Percentage discount for underwriter	5.70%
Proceeds from sales of common stock	23,538,000						11,600,000	6,900,000
Common stock, approved sale value				10,000,000	12,000,000
Ownership limitation					4.95%
Stock purchase agreement durations				24 months
Stock purchase agreement, remaining amount								$ 3,000,000