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TAXES ON INCOME (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Taxes On Income [Line Items] |  |  |  |  |  |
Revenues |  | $ 135,922 | $ 110,100 | $ 95,837 |  |
Israeli Income tax rate |  | 23.00% | 23.00% | 23.00% |  |
Tax-exempt period |  | 2 years |  |  |  |
Dividend, withholding tax rate |  | 15.00% |  |  |  |
Patent use right, period |  | 8 years |  |  |  |
Expense deductible period |  | 3 years |  |  |  |
Net operating loss carry forwards |  | $ 82,080 |  |  |  |
Net operating loss offset limitation, percentage of accumulated losses |  | 14.00% |  |  |  |
Net operating loss offset limitation, percentage of taxable income |  | 50.00% |  |  |  |
Capital loss carry forwards |  | $ 27,243 |  |  |  |
Provision |  | 743 |  |  |  |
Amounts added to provision for ASC 740-10 during year |  | $ 500 |  |  |  |
Israeli resident corporation [Member] |  |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |  |
Dividend, withholding tax rate |  | 0.00% | 0.00% | 0.00% |  |
Israeli resident individual [Member] |  |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |  |
Dividend, withholding tax rate |  | 20.00% | 20.00% | 20.00% |  |
non-Israeli resident [Member] |  |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |  |
Dividend, withholding tax rate |  | 20.00% | 20.00% | 20.00% |  |
Minimum [Member] |  |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |  |
Change in corporate tax rate |  | 10.00% |  |  |  |
Tax-exempt period |  | 5 years |  |  |  |
Maximum [Member] |  |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |  |
Change in corporate tax rate |  | 25.00% |  |  |  |
Tax-exempt period |  | 8 years |  |  |  |
Preferred Enterprise [Member] |  |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |  |
Revenues | $ 10,000,000 |  |  |  |  |
Israeli Income tax rate | 12.00% |  |  |  |  |
Special Technological Preferred Enterprise [Member] |  |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |  |
Revenues | $ 10,000,000 |  |  |  |  |
Israeli Income tax rate | 6.00% |  |  |  |  |
Israel [Member] |  |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |  |
Write-off prepaid and withholding taxes |  | $ 4,991 |  |  |  |
United States of America [Member] | Minimum [Member] |  |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |  |
Net operating loss carry forwards |  | $ 4,669 |  |  |  |
Expiration of operating loss carry forward |  | Dec. 31, 2026 |  |  |  |
United States of America [Member] | Maximum [Member] |  |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |  |
Net operating loss carry forwards |  | $ 7,434 |  |  |  |
Expiration of operating loss carry forward |  | Dec. 31, 2037 |  |  |  |
Development Zone A [Member] |  |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |  |
Israeli Income tax rate |  |  |  |  | 9.00% | 9.00%
Change in corporate tax rate |  | 7.50% |  |  |  |
Outside Development Zone [Member] |  |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |  |
Israeli Income tax rate |  |  |  |  | 16.00% | 16.00%

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