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
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Cash and cash equivalents $ 3,005 $ 5,109 $ 6,777  
Restricted cash 817 2,005 2,040  
Total cash and cash equivalents and restricted cash $ 3,822 $ 7,114 $ 8,817 $ 20,612