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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) € in Thousands, $ in Thousands |  | 1 Months Ended | 5 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 14, 2015 USD ($) | Apr. 17, 2016 USD ($) | Oct. 31, 2014 USD ($) | Dec. 31, 2017 USD ($) item shares | Dec. 31, 2016 USD ($) item shares | Dec. 31, 2015 USD ($) item shares | Dec. 31, 2017 EUR (€) | Dec. 31, 2014 USD ($) | Dec. 31, 2014 EUR (€)
Average interest rate, short-term bank deposits in U.S. dollars |  |  |  | 1.46% | 1.35% |  |  |  |
Marketable securities impairment losses |  |  |  |  |  |  |  |  |
Deferred revenues |  |  |  |  |  |  |  |  |
Number of licensed programs to achieve substantive milestones revenues | item |  |  |  |  | 1 | 1 |  |  |
Revenue recognition under milestone method | $ 7,800 | $ 400 | $ 7,200 |  | $ 400 | $ 7,800 |  |  |
Severance expenses |  |  |  | 365 | 486 | 484 |  |  |
Net gain on derivative transactions |  |  |  | 422 | 75 | 202 |  |  |
Net gain on derivative classified to operating expenses as effective portion |  |  |  | 422 | 75 | 177 |  |  |
Net gain on derivative recorded as financial and other income, net for the ineffective portion |  |  |  |  |  | 25 |  |  |
Unrealized gain (loss) arising from derivative contracts |  |  |  | 17 | 7 | (19) |  |  |
Fair value of outstanding forward contracts |  |  |  | $ 17 | $ 7 |  |  |  |
Number of investments in affiliates | item |  |  |  | 2 |  |  |  |  |
Derivative, contract period |  |  |  | 12 days | 12 months |  |  |  |
Derivative, maturity date |  |  |  | Jan. 12, 2018 | Dec. 31, 2017 |  |  |  |
Derivative, notional amount |  |  |  | $ 177 | $ 6,548 |  |  |  |
Cumulative effect adjustment from adoption of ASU 2016-09 adoption |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  | 1,050 | $ 993 | $ 1,077 |  |  |
Additional paid-in capital [Member] |  |  |  |  |  |  |  |  |
Cumulative effect adjustment from adoption of ASU 2016-09 adoption |  |  |  | $ 211 |  |  |  |  |
Neviah [Member] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 25.12% |  |  | 25.12% |  |
Keddem [Member] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 29.41% |  |  | 29.41% |  |
Investment amount |  |  |  |  |  |  |  | $ 155 |
Merck Holdings [Member] | Neviah [Member] | Convertible Bridge Loan Agreement [Member] |  |  |  |  |  |  |  |  |
Face amount | € |  |  |  |  |  |  | € 500 |  | € 500
Loan grant date |  |  |  | Dec. 17, 2014 |  |  |  |  |
Maturity term |  |  |  | 18 months |  |  |  |  |
Interest rate (as a percent) |  |  |  | 2.00% |  |  | 2.00% | 2.00% | 2.00%
Options [Member] |  |  |  |  |  |  |  |  |
Weighted average number of shares related to outstanding options excluded from the calculations of diluted net loss per share | shares |  |  |  | 8,774,219 | 7,943,914 | 7,228,011 |  |  |

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