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Summary of Business Organization, Operations and Significant Accounting Policies - Accounting Standards Implementation (Details) - USD ($)
$ in Millions
 12 Months Ended
Jan. 01, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Excess tax benefit, amount   $ 1.6
Subsequent Event | Accounting Standards Update 2014-09    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Revenue, initial application period cumulative effect transition, reclassifications (less than 2 million annually) $ 2.0