Annual report pursuant to Section 13 and 15(d)

SIGNIFICANT ACCOUNTING POLICIES (Details)

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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]    
1 Year or Less $ 7,180
U.S. Treasury Bonds [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
1 Year or Less 2,752
U.S Agency Bonds [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
1 Year or Less 1,254
Certificates of Deposit [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
1 Year or Less $ 3,174