Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Summary of Cash, Cash Equivalents and Restricted Cash (Details)

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Summary of Significant Accounting Policies - Summary of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]        
Cash and cash equivalents $ 748 $ 3,605    
Restricted cash 29 35    
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows $ 777 $ 3,640 $ 9,276 $ 3,970