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RELATED PARTY BALANCES AND TRANSACTIONS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Related Party Transactions [Abstract] |  |  |
Trade payables and accrued expenses | $ 83 | $ 104 |
Amounts charged to research and development expenses | $ 294 | $ 241 | $ 314

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