Sale Of Common Shares And Issuance Of Common Stock Warrants (Details) (USD $)				3 Months Ended		3 Months Ended
	May 02, 2012	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 Series A Common Share Warrants [Member]	Mar. 31, 2011 Series A Common Share Warrants [Member]	Mar. 31, 2012 Series B Common Share Warrants [Member]	Mar. 31, 2011 Series B Common Share Warrants [Member]
Sale Of Common Shares And Issuance Of Common Stock Warrants [Line Items]
Common share warrants outstanding		227,376	227,376		35,992		35,992
Common share warrants exercise price	$ 12.50		$ 76.41
Common share warrants expiration dates				Jun. 10, 2011		Dec. 20, 2011