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Investment in Equity Affiliate (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 12, 2017
Schedule of Equity Method Investments [Line Items]      
Loss from equity-method investment $ (67) $ (56)  
Corridor      
Schedule of Equity Method Investments [Line Items]      
Aggregate cost     $ 3,000
Loss from equity-method investment $ 67 $ 56