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SHAREHOLDERS' EQUITY (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Vesting period | 4 years |  |
Expiration period | 10 years |  |
Ordinary shares reserved for issuance | 8,639,000 |  |
Ordinary shares available for future grant | 1,133,883 |  |
Total intrinsic value of options exercised | $ 770 | $ 626 | $ 4,617
Total unrecognized compensation cost | $ 1,662 | $ 2,053 | $ 1,980
Additional Shares authorized |  | 16,256,688 |
Minimum [Member] |  |  |
Expiration period | 6 years |  |
Maximum [Member] |  |  |
Expiration period | 10 years |  |
Stock Option [Member] |  |  |
Weighted average grant date fair value of options granted | $ 1.06 | $ 1.39 | $ 1.79
RSU [Member] |  |  |
Weighted average grant date fair value of options granted | $ 2.11 | $ 2.79 | $ 3.23
Weighted average period | 1 year |  |
Total unrecognized compensation cost | $ 1,730 |  |

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