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Property And Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Accumulated depreciation $ 0.7 $ 0.7
Furniture And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, purchase value $ 1.0 $ 0.9