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SHAREHOLDERS' EQUITY (Narrative) (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) ₪ / shares | Dec. 31, 2020 ₪ / shares | Dec. 31, 2019 ₪ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share capital, amount authorized | $ 20,000 |  |  |  |  |
Ordinary shares, shares authorized | shares | 200,000,000 | 200,000,000 |  |  |  |
Ordinary shares, par value per share | ₪ / shares |  |  |  |  | ₪ 0.1 | ₪ 0.1
Purchase of ordinary shares |  |  |  |  |  |
Intrinsic value of options outstanding | 4,578 | 3,510 | $ 1,518 | $ 1,518 |  |
Intrinsic value of options exercisable | 4,226 | 2,791 | 1,058 | 1,058 |  |
Intrinsic value of options vested and expected to vest | 4,568 | 3,399 | 1,246 | $ 1,246 |  |
Intrinsic value of options exercised | $ 1,437 | $ 769 | $ 201 |  |  |
Stock options vested during period | shares | 116,321 |  |  |  |  |
Weighted average remaining contractual life of options outstanding | 2 years 8 months 1 day |  |  |  |  |
Weighted-average remaining contractual life of exercisable options | 2 years 6 months 29 days |  |  |  |  |
Weighted-average grant-date fair value of the options granted | ₪ / shares |  |  |  | $ 2.89 |  |
Stock Compensation Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost related to non-vested stock options | $ 120 |  |  |  |  |
Unrecognized compensation cost, recognition period | 2 years 3 months 29 days |  |  |  |  |
Shares available for future issuance | shares | 72,373 |  |  |  |  |
Vesting period for plan | 4 years |  |  |  |  |
Options, expiration period | 10 years |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost related to non-vested stock options | $ 13,091 |  |  |  |  |
Unrecognized compensation cost, recognition period | 2 years 3 months 29 days |  |  |  |  |
Granted | shares | 869,250 | 1,001,000 |  |  |  |
Restricted Stock Units (RSUs) [Member] | 2006 option plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period for plan | 4 years |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | 2016 option plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted | shares | 869,250 | 1,001,000 |  |  |  |

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