Stockholders' Equity (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified						1 Months Ended
	Dec. 31, 2011	Jan. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Preferred Stock [Member]	Dec. 31, 2011 Series A Junior Participating Preferred Stock [Member]	Jan. 31, 2011 Common Stock	Jan. 24, 2011 Common Stock
Preferred Stock, Number of Shares, Par Value and Other Disclosures
Preferred stock, shares authorized	10,000,000		10,000,000	10,000,000	3,100,000
Preferred stock, par value	$ 0.0001		$ 0.0001	$ 0.0001
Common Stock, Number of Shares, Par Value and Other Disclosures
Common stock, shares issued	114,485,000	19,000,000	94,517,000				19,000,000
Proceeds from sale of common stock						$ 220.4
Stock offering expenses						$ 0.6