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MARKETABLE SECURITIES | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
MARKETABLE SECURITIES | NOTE 3:- MARKETABLE SECURITIES Marketable securities with contractual maturities of up to one year are as follows:
|  | December 31, |
|  | 2017 |  |  | 2016 |
|  | 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 |  | $ | 1,026,555 |  |  | $ | 48 |  |  | $ | (1,698 | ) |  | $ | 1,024,905 |  |  | $ | 915,302 |  |  | $ | 311 |  |  | $ | (446 | ) |  | $ | 915,167 |
Government-sponsored enterprises debentures |  |  | 112,951 |  |  |  | 1 |  |  |  | (275 | ) |  |  | 112,677 |  |  |  | 149,972 |  |  |  | 99 |  |  |  | (61 | ) |  |  | 150,010 |
Government and corporate debentures - floating interest rate |  |  | 27,681 |  |  |  | 14 |  |  |  | (11 | ) |  |  | 27,684 |  |  |  | 13,247 |  |  |  | 16 |  |  |  | — |  |  |  | 13,263 |
|  | $ | 1,167,187 |  |  | $ | 63 |  |  | $ | (1,984 | ) |  | $ | 1,165,266 |  |  | $ | 1,078,521 |  |  | $ | 426 |  |  | $ | (507 | ) |  | $ | 1,078,440 |
Marketable securities with contractual maturities of over one year through five years are as follows:
|  | December 31, |
|  | 2017 |  |  | 2016 |
|  | 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 |  | $ | 1,985,849 |  |  | $ | 384 |  |  | $ | (15,204 | ) |  | $ | 1,971,029 |  |  | $ | 1,770,641 |  |  | $ | 1,903 |  |  | $ | (11,024 | ) |  | $ | 1,761,520 |
Government-sponsored enterprises debentures |  |  | 424,619 |  |  |  | — |  |  |  | (4,687 | ) |  |  | 419,932 |  |  |  | 520,669 |  |  |  | 282 |  |  |  | (4,052 | ) |  |  | 516,899 |
Government and corporate debentures - floating interest rate |  |  | 46,247 |  |  |  | 134 |  |  |  | (27 | ) |  |  | 46,354 |  |  |  | 17,610 |  |  |  | 70 |  |  |  | (2 | ) |  |  | 17,678 |
|  | $ | 2,456,715 |  |  | $ | 518 |  |  | $ | (19,918 | ) |  | $ | 2,437,315 |  |  | $ | 2,308,920 |  |  | $ | 2,255 |  |  | $ | (15,078 | ) |  | $ | 2,296,097 |
Investments with continuous unrealized losses for less than 12 months and 12 months or greater and their related fair values were as follows:
|  | December 31, 2017 |
|  | Less than 12 months |  |  | 12 months or greater |  |  | Total |
|  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |  |  | Fair Value |  |  | Unrealized losses |
Government and corporate debentures - fixed interest rate |  | $ | 1,647,125 |  |  | $ | (7,318 | ) |  | $ | 1,063,690 |  |  | $ | (9,585 | ) |  | $ | 2,710,815 |  |  | $ | (16,903 | )
Government-sponsored enterprises debentures |  |  | 236,403 |  |  |  | (1,281 | ) |  |  | 294,986 |  |  |  | (3,681 | ) |  |  | 531,389 |  |  |  | (4,962 | )
Government and corporate debentures - floating interest rate |  |  | 27,810 |  |  |  | (37 | ) |  |  | — |  |  |  | — |  |  |  | 27,810 |  |  |  | (37 | )
|  | $ | 1,911,338 |  |  | $ | (8,636 | ) |  | $ | 1,358,676 |  |  | $ | (13,266 | ) |  | $ | 3,270,014 |  |  | $ | (21,902 | )
|  | December 31, 2016 |
|  | Less than 12 months |  |  | 12 months or greater |  |  | Total |
|  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |  |  | Fair Value |  |  | Unrealized losses |
Government and corporate debentures - fixed interest rate |  | $ | 1,717,212 |  |  | $ | (11,440 | ) |  | $ | 40,465 |  |  | $ | (30 | ) |  | $ | 1,757,677 |  |  | $ | (11,470 | )
Government-sponsored enterprises debentures |  |  | 464,080 |  |  |  | (4,112 | ) |  |  | 4,999 |  |  |  | (1 | ) |  |  | 469,079 |  |  |  | (4,113 | )
Government and corporate debentures - floating interest rate |  |  | 3,000 |  |  |  | (2 | ) |  |  | — |  |  |  | — |  |  |  | 3,000 |  |  |  | (2 | )
|  | $ | 2,184,292 |  |  | $ | (15,554 | ) |  | $ | 45,464 |  |  | $ | (31 | ) |  | $ | 2,229,756 |  |  | $ | (15,585 | )
As of December 31, 2017 and 2016, interest receivable amounted to $ 19,871 and $ 17,057 respectively, and is included within other current assets in the balance sheets.

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