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Basis of Presentation and Significant Accounting Policies - Property and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Depreciation expense $ 0.9 $ 1.0 $ 1.0
Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life of property and equipment 3 years    
Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life of property and equipment 5 years