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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Significant Accounting Policies      
Cash and cash equivalents $ 25,034 $ 25,496  
Restricted cash 100 89  
Total $ 25,134 $ 25,585 $ 19,030