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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

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