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Basis of Presentation - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]        
Cash and cash equivalents $ 1,637 $ 4,054 $ 9,882  
Restricted cash - pledged deposits for performance bonds 3,668   3,941  
Cash, cash equivalents and restricted cash shown in the statement of cash flows $ 5,305 $ 7,722 $ 13,823 $ 7,273