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INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Operating loss carryforward | $ 80,134 | $ 65,267
Research and development | 9,001 | 9,377
Accrued social benefits and other | 2,389 | 863
Right of use assets | (651) | (763)
Lease liabilities | 742 | 840
Property and equipment | 2 | 1
Deferred tax asset before valuation allowance | 91,617 | 75,585
Valuation allowance | (91,617) | (75,585)
Net deferred tax asset |  |

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