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TAXES ON INCOME (Deferred Income Taxes) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
In respect of: |  |
Research and development expenses | $ 9,598 | $ 9,247
Other timing differences | 40 | 25
Net operating loss carry forwards | 54,122 | 50,236
Valuation allowance | $ (63,760) | $ (59,508)

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