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MARKETABLE SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Schedule of Marketable Securities Calssified as Available-for-sale Securities | At December 31, 2018 and 2019, the Company held marketable securities classified as available-for-sale securities as follows:
|  | December 31, |
|  | 2018 |  |  | 2019 |
LESS THAN A YEAR |  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |  |  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Government and corporate debentures - fixed interest rate |  | $ | 22,028 |  |  | $ | 3 |  |  | $ | (39 | ) |  | $ | 21,992 |  |  | $ | 148,437 |  |  | $ | 329 |  |  | $ | (15 | ) |  | $ | 148,751 |
Government-sponsored enterprises |  |  | - |  |  |  | - |  |  |  | - |  |  |  |  |  |  |  | 12,548 |  |  |  |  |  |  |  | (1 | ) |  |  | 12,547 |
Government and corporate debentures - floating interest rate |  |  | 1,000 |  |  |  | - |  |  |  | - |  |  |  | 1,000 |  |  |  | 3,003 |  |  |  | 1 |  |  |  | (1 | ) |  |  | 3,003 |
|  | $ | 23,028 |  |  | $ | 3 |  |  | $ | (39 | ) |  | $ | 22,992 |  |  | $ | 163,988 |  |  | $ | 330 |  |  | $ | (17 | ) |  | $ | 164,301 |
|  | December 31, |
|  | 2018 |  |  | 2019 |
MORE THAN 1 YEAR |  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |  |  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Government and corporate debentures - fixed interest rate |  | $ | 47,504 |  |  | $ | 4 |  |  | $ | (283 | ) |  | $ | 47,225 |  |  | $ | 135,040 |  |  | $ | 595 |  |  | $ | (65 | ) |  | $ | 135,570 |
Government-sponsored enterprises |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 17,579 |  |  |  | 9 |  |  |  | (3 | ) |  |  | 17,585 |
Government and corporate debentures - floating interest rate |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 24,141 |  |  |  | 8 |  |  |  | (6 | ) |  |  | 24,143 |
|  | $ | 47,504 |  |  | $ | 4 |  |  | $ | (283 | ) |  | $ | 47,225 |  |  | $ | 176,760 |  |  | $ | 612 |  |  | $ | (74 | ) |  | $ | 177,298 |

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