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Property and Equipment and Assets Held For Sale - Proceeds From Sale (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Property, Plant and Equipment [Line Items]      
(Gain) loss on dispositions of property and equipment   $ (15) $ 15
Equipment      
Property, Plant and Equipment [Line Items]      
Proceeds from sale of equipment $ 200    
(Gain) loss on dispositions of property and equipment $ 18