Quarterly report pursuant to Section 13 or 15(d)

SIGNIFICANT ACCOUNTING POLICIES (Details)

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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Significant Accounting Policies        
Cash and cash equivalents $ 16,448 $ 25,034    
Restricted cash 100 100    
Total $ 16,548 $ 25,134 $ 19,342 $ 25,585