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MARKETABLE SECURITIES | 12 Months Ended
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Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract] |
MARKETABLE SECURITIES | NOTE 4:- MARKETABLE SECURITIES Marketable securities with contractual maturities of up to one year are as follows:
|  | December 31, |
|  | 2016 |  |  | 2015 |
|  | 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 |  | $ | 915,302 |  |  | $ | 311 |  |  | $ | (446 | ) |  | $ | 915,167 |  |  | $ | 994,600 |  |  | $ | 3,088 |  |  | $ | (752 | ) |  | $ | 996,936 |
Government-sponsored enterprises debentures |  |  | 149,972 |  |  |  | 99 |  |  |  | (61 | ) |  |  | 150,010 |  |  |  | 46,230 |  |  |  | 25 |  |  |  | (17 | ) |  |  | 46,238 |
Government and corporate debentures - floating interest rate |  |  | 13,247 |  |  |  | 16 |  |  |  | — |  |  |  | 13,263 |  |  |  | 41,690 |  |  |  | 24 |  |  |  | (7 | ) |  |  | 41,707 |
|  | $ | 1,078,521 |  |  | $ | 426 |  |  | $ | (507 | ) |  | $ | 1,078,440 |  |  | $ | 1,082,520 |  |  | $ | 3,137 |  |  | $ | (776 | ) |  | $ | 1,084,881 |
Marketable securities with contractual maturities of over one year through five years are as follows:
|  | December 31, |
|  | 2016 |  |  | 2015 |
|  | 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 |  | $ | 1,770,641 |  |  | $ | 1,903 |  |  | $ | (11,024 | ) |  | $ | 1,761,520 |  |  | $ | 1,947,588 |  |  | $ | 1,439 |  |  | $ | (8,654 | ) |  | $ | 1,940,373 |
Government-sponsored enterprises debentures |  |  | 520,669 |  |  |  | 282 |  |  |  | (4,052 | ) |  |  | 516,899 |  |  |  | 366,700 |  |  |  | 109 |  |  |  | (1,243 | ) |  |  | 365,566 |
Government and corporate debentures - floating interest rate |  |  | 17,610 |  |  |  | 70 |  |  |  | (2 | ) |  |  | 17,678 |  |  |  | 25,303 |  |  |  | 11 |  |  |  | (66 | ) |  |  | 25,248 |
|  | $ | 2,308,920 |  |  | $ | 2,255 |  |  | $ | (15,078 | ) |  | $ | 2,296,097 |  |  | $ | 2,339,591 |  |  | $ | 1,559 |  |  | $ | (9,963 | ) |  | $ | 2,331,187 |
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, 2016 |
|  | Investments with continuous unrealized losses for less than 12 months |  |  | Investments with continuous unrealized losses for 12 months or greater |  |  | Total Investments with continuous unrealized losses |
|  | 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 | )
|  | December 31, 2015 |
|  | Investments with continuous unrealized losses for less than 12 months |  |  | Investments with continuous unrealized losses for 12 months or greater |  |  | Total Investments with continuous unrealized losses |
|  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |
Government and corporate debentures—fixed interest rate |  | $ | 2,138,546 |  |  | $ | (9,027 | ) |  | $ | 68,084 |  |  | $ | (379 | ) |  | $ | 2,206,630 |  |  | $ | (9,406 | )
Government-sponsored enterprises debentures |  |  | 308,026 |  |  |  | (1,252 | ) |  |  | 5,992 |  |  |  | (8 | ) |  |  | 314,018 |  |  |  | (1,260 | )
Government and corporate debentures—floating interest rate |  |  | 26,688 |  |  |  | (73 | ) |  |  | — |  |  |  | — |  |  |  | 26,688 |  |  |  | (73 | )
|  | $ | 2,473,260 |  |  | $ | (10,352 | ) |  | $ | 74,076 |  |  | $ | (387 | ) |  | $ | 2,547,336 |  |  | $ | (10,739 | )
As of December 31, 2016 and 2015, interest receivable amounted to $ 17,057 and $ 17,754 respectively, and is included within other current assets in the balance sheets.

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