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INCOME TAXES (Narrative) (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 14, 2015 | Apr. 17, 2016 | Oct. 31, 2014 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2013
Israeli corporate tax rate |  |  |  |  | 24.00% | 25.00% | 26.50% |
Tax payment withheld |  |  |  |  |  | $ 20 | $ 390 |
Milestone payments received | $ 7,800 | $ 400 | $ 7,200 |  |  | $ 400 | $ 7,800 |
Upfront payment received |  |  |  |  |  |  |  | $ 10,000
2018 year [Member] |  |  |  |  |  |  |  |
Israeli corporate tax rate |  |  |  | 23.00% |  |  |  |
United States [Member] |  |  |  |  |  |  |  |
Net operating loss carryforward |  |  |  |  | $ 9,200 |  |  |
United States [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Year of expiration of operating loss carryforward |  |  |  |  | Dec. 31, 2032 |  |  |
United States [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Year of expiration of operating loss carryforward |  |  |  |  | Dec. 31, 2020 |  |  |
Domestic Tax Authority [Member] |  |  |  |  |  |  |  |
Net operating loss carryforward |  |  |  |  | $ 227,000 |  |  |

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