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Summary of Significant Accounting Policies - Advertising Expenditures (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accounting Policies [Abstract]        
Advertising costs $ 0.2 $ 0.2 $ 0.5 $ 0.6