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MARKETABLE SECURITIES - Net realized gains and reclassification (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Debt Securities, Available-for-sale [Abstract]        
Net realized (loss) gain $ (1) $ 2 $ (20) $ 12
Reclassification of net realized gains from other comprehensive income $ (1) $ 2 $ (20) $ 12