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Marketable Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Marketable Securities [Abstract]    
Fair value through profit or loss [1] $ 1,209
Available-for-sale 12,929 12,506
Marketable securities, Total $ 14,138 $ 12,506
[1] The Group recognized trading gains in the amount of $ 10 during the year ended December 31, 2017.