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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 20, 2018 | Dec. 18, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2013
Average interest rate, short-term bank deposits in U.S. dollars |  |  | 1.01% | 2.37% |  |
Amortization in R&D expenses |  |  | $ 829 | $ 627 | $ 29 |
Revenue recognition under milestone method | $ 7,800 | $ 2,000 |  |  |  |
Severance expenses |  |  | 572 | 366 | 556 |
Net gain on derivative transactions |  |  | 0 | 0 | 20 |
Unrealized gain (loss) arising from derivative contracts |  |  | 0 | $ 0 | $ 17 |
Investment amount |  |  | 12,000 |  |  |
Upfront payment received |  |  | 10,000 |  |  | $ 10,000
Potential milestone compensation |  |  | 200,000 |  |  | $ 250,000
Accrued milestone payment |  |  | 2,000 |  |  |
Deferred participation of BMS in R&D expenses |  |  | $ 4,121 |  |  |
Options [Member] |  |  |  |  |  |
Weighted average number of shares related to outstanding options excluded from the calculations of diluted net loss per share |  |  | 7,150,648 | 12,754,803 | 11,035,644 |

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