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Basis Of Presentation and Significant Accounting Policies - Components of Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]        
Cash and cash equivalents $ 2,576 $ 5,337    
Restricted Cash and Cash Equivalents 114 114    
Total cash, cash equivalents, restricted cash, and restricted cash equivalents $ 2,690 $ 5,451 $ 12,086 $ 12,750