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Basis Of Presentation and Significant Accounting Policies - Components of Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 24, 2018
May 18, 2018
Dec. 31, 2017
Sep. 30, 2017
Aug. 31, 2017
Dec. 31, 2016
May 10, 2016
Cash and Cash Equivalents [Line Items]                
Cash and cash equivalents $ 9,968     $ 2,319        
Restricted cash and cash equivalents 114     10,431        
Total cash, cash equivalents, restricted cash, and restricted cash equivalents 10,082     12,750 $ 2,369   $ 5,962  
Corporate Credit Cards                
Cash and Cash Equivalents [Line Items]                
Restricted cash and cash equivalents $ 100     200        
Secured Debt                
Cash and Cash Equivalents [Line Items]                
Restricted cash   $ 8,500            
Amendment Agreement | Secured Debt                
Cash and Cash Equivalents [Line Items]                
Maximum prepayment of principle if demanded           $ 18,500   $ 18,500
Restricted cash     $ 8,500 $ 10,200