Quarterly report pursuant to Section 13 or 15(d)

SIGNIFICANT ACCOUNTING POLICIES (Details)

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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Significant Accounting Policies        
Cash and cash equivalents $ 14,674 $ 25,496    
Restricted cash 99    
Total $ 14,773 $ 25,585 $ 29,399 $ 19,030