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Revolving Credit Facility (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jul. 14, 2017
Revolving Credit Facility      
Amount utilized for facility security deposits $ 1.5    
New Revolving Credit Facility      
Revolving Credit Facility      
Maximum borrowings     $ 10.0
Amount outstanding $ 0.0 $ 0.0