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Subsequent event (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 9 Months Ended
Oct. 31, 2012
Sep. 30, 2012
Feb. 08, 2012
Subsequent Event [Line Items]      
Interest rate (LIBOR)   5.00%  
Purchase of restricted shares and restricted warrants 40,000,000    
Sale of aggregate warrant and restricted shares purchase price     $ 77.2
Common Stock Purchase 30,000,000 30,000,000  
Subsequent event (Textual) [Abstract]      
Promissory note maturity date   Jan. 01, 2014  
Description of variable rate interest   annual interest rate on all outstanding principal to the one year London Interbank Offered Rate (LIBOR) on December 31, 2012 plus 5%, effective beginning on January 1, 2013.  
Underwritten public offering 40,000,000    
Additional common stock shares issued 6,000,000 6,000,000  
Additional Purchase Of Common Stock 4,500,000 4,500,000  
Warrant entitles the holder to purchase a share of common stock 75.00%    
Rate at which warrants are exercisable 2.60   2.40
Warrants exercisable expiration period 53 Weeks    
Net proceeds from public offering 86.0 86.0  
Forecast [Member]
      
Subsequent Event [Line Items]      
Interest rate (LIBOR)   5.00%  
Mann Group [Member]
      
Subsequent Event [Line Items]      
Selling price of restricted shares $ 2.59    
Sale of aggregate warrant and restricted shares purchase price 107.4    
Amended and restated promissory note outstanding principal amount $ 350    
Warrant [Member]
      
Subsequent Event [Line Items]      
Combined purchased price common stock 2.00    
Warrant [Member] | Mann Group [Member]
      
Subsequent Event [Line Items]      
Restricted warrants sale price $ 0.125    
Private Placement [Member] | Restricted Stock [Member]
      
Subsequent Event [Line Items]      
Purchase of restricted shares and restricted warrants 40,000,000    
Subsequent event (Textual) [Abstract]      
Underwritten public offering 40,000,000    
Private Placement [Member] | Warrant [Member]
      
Subsequent Event [Line Items]      
Purchase of restricted shares and restricted warrants 40,000,000    
Subsequent event (Textual) [Abstract]      
Underwritten public offering 40,000,000