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Common Stock Preferred Stock (Details) - shares
Dec. 31, 2019
Dec. 31, 2018
Jun. 23, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Preferred Stock, Shares Authorized 50,000,000 50,000,000  
Preferred Stock, Shares Issued 0 0  
Preferred Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Preferred Stock, Shares Authorized     50,000,000
Preferred Stock, Shares Issued   0