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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 02, 2019 | Dec. 31, 2017
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Short-term deposits, weighted average interest rate | 0.85% | 2.33% |  |  |
Short-term bank deposits due to hedging transacations | $ 2,500 | $ 2,500 |  |  |
Inventory write-offs | 1,928 | 629 | $ 2,231 |  |
Cumulative inventory write-off | 4,624 | 2,839 |  |  |
Impairment of intangible assets |  |  |  |  |
Reserve for sales returns | 290 | 163 |  |  |
Advertising expenses | 1,103 | 1,274 | 1,270 |  |
Severance expense | 3,619 | 2,249 | 1,950 |  |
Allowance for credit losses | 2,309 | 1,867 | 1,415 |  | $ 1,292
Grants participations excluded from research and development costs | $ 339 | 378 | 374 |  |
Weighted average cost of debt | 2.00% |  |  |  |
Changes in deferred revenue | $ 712 |  |  |  |
ROU assets | 4,458 | 6,368 |  | $ 6,700 |
ROU lease liabilites | 4,648 |  |  | $ 6,700 |
Remaining performance obligations as of the balance date for long-term | 110,000 |  |  |  |
Amortization of deferred commission | 1,286 |  |  |  |
Revenues | $ 135,922 | $ 110,100 | $ 95,837 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Outstanding options and warrants excluded from the calculation of diluted income per share | 2,897,273 | 3,105,801 | 2,998,174 |  |
Optenet [Member] |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Expected volatility | 42.50% |  |  |  |
Netonomy [Member] |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Expected volatility | 20.70% |  |  |  |
Minimum [Member] |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Annual pre-vesting forfeiture rate | 0.00% | 0.00% | 0.00% |  |
Annual post-vesting forfeiture rate | 0.00% | 0.00% | 0.00% |  |
Remaining performance obligations as of the balance date for short-term | $ 77,000 |  |  |  |
Maximum [Member] |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Annual pre-vesting forfeiture rate | 33.00% | 33.00% | 33.00% |  |
Annual post-vesting forfeiture rate | 41.00% | 41.00% | 41.00% |  |
Remaining performance obligations as of the balance date for long-term | $ 33,000 |  |  |  |

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