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Basis of Presentation and Significant Accounting Policies - Components of Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
May 18, 2018
Dec. 31, 2017
Dec. 31, 2016
May 10, 2016
Cash and Cash Equivalents [Line Items]          
Cash and cash equivalents $ 5,337   $ 2,319    
Restricted cash and cash equivalents 114   10,431    
Total cash, cash equivalents, restricted cash, and restricted cash equivalents 5,451   12,750 $ 6,047  
Corporate Credit Cards          
Cash and Cash Equivalents [Line Items]          
Restricted cash and cash equivalents $ 100   200    
Amendment Agreement | Secured Debt          
Cash and Cash Equivalents [Line Items]          
Maximum prepayment of principle if demanded         $ 18,500
Restricted cash   $ 8,500 $ 10,200