Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Cash and Cash Equivalents) (Details)

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Summary of Significant Accounting Policies (Cash and Cash Equivalents) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Cash and cash equivalents $ 1,844 $ 3,631 $ 3,351  
Restricted cash 1,464 1,212 4,050  
Total cash and cash equivalents and restricted cash $ 3,308 $ 4,843 $ 7,401 $ 7,114