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MARKETABLE SECURITIES - Schedule of Changes in Marketable Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Marketable Securities [Abstract] |  |  |
Balance at the beginning of the year | $ 836 | $ 19,231 |
Repurchase of marketable securities pledged to creditors | 8,392 | 10,272 |
Disposals | 0 | 16,749 |
Unrealized gain (loss) | 1,737 | (3,526) | $ 0
Marketable securities pledged to creditors | (7,323) | (8,392) |
Total | $ 3,642 | $ 836 | $ 19,231

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