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
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Cash and cash equivalents $ 4,755 $ 5,109 $ 12,034  
Restricted cash 1,432 2,005 2,291  
Total cash and cash equivalents and restricted cash(1) $ 6,187 [1] $ 7,114 $ 14,325 [1] $ 20,612
[1] Represents the total of the amounts at the end of the periods presented on the Consolidated Statements of Cash Flows as required by ASU 2016-18. The cash and cash equivalents and restricted cash balance as of December 31, 2017 and December 31, 2016 (the beginning of the periods presented) was $7,114 and $20,612, respectively.