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Subsequent Events (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 2 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended
Feb. 28, 2013
Subsequent Event [Member]
Dec. 31, 2011
Underwritten public offering [Member]
Dec. 31, 2011
Underwritten public offering [Member]
Mar. 07, 2013
Underwritten public offering [Member]
Subsequent Event [Member]
Subsequent Events (Textual) [Abstract]        
Shares of common stock sold under Sales Agreement 8,222,966      
Net proceeds from the transaction $ 5.6 $ 3.7    
Shares of common stock reserved for issuance under underwriting agreement       27,377,266
Purchase price per unit of common stock and warrant (in dollars per unit)   0.5195   0.55
Number of shares called by each warrant (number of shares)       0.50
Exercise price per share (in dollars per share)       $ 0.7936
Common stock purchase warrant       13,688,633
Term of the warrants in years     5 years 5 years 6 months
Net proceeds expected from the issue of common shares (in dollars)       $ 14.0