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Redeemable Preferred Stock and Stockholders' Equity (Details) (USD $)
9 Months Ended 1 Months Ended 1 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Class A Common Stock
Dec. 31, 2011
Class A Common Stock
Sep. 30, 2012
Class B Common Stock
Dec. 31, 2011
Class B Common Stock
Sep. 30, 2012
Common Stock
Apr. 30, 2012
Common Stock
Dec. 31, 2011
Common Stock
Sep. 30, 2007
Common Stock
Class A Common Stock
Dec. 31, 2011
Common Stock
Class A Common Stock
Dec. 31, 2011
Common Stock
Class B Common Stock
Sep. 30, 2007
Preferred Stock
Apr. 30, 2012
Preferred Stock
Dec. 31, 2011
Preferred Stock
Dec. 31, 2011
Preferred Stock
Redeemable Series A Preferred Stock
Redeemable Preferred Stock and Stockholders' Equity                                
Number of shares authorized to be issued   72,300                            
Common stock, Authorized shares 110,000,000 2,300 2,000 2,000 300 300   110,000,000 2,300   2,000 300        
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001             $ 0.0001              
Series A redeemable preferred stock, Authorized shares 0 70,000                       10,000,000 70,000 70,000
Series A redeemable preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001                         $ 0.0001  
Number of shares issued             4,800,000     1,000     34,999.5      
Share price (in dollars per share)             $ 8.00     $ 0.50     $ 1,000      
Common shares outstanding 9,602,970 0 0 1,000 0 0 4,802,970 4,802,970