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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Financial Assets Measured at Fair Value on Recurring Basis | The Company’s financial assets measured at fair value on a recurring basis, excluding accrued interest components, consisted of the following types of instruments as of the following dates:
|  | December 31, 2017 |
|  | Fair value measurements using input type |
|  | Level 1 |  |  | Level 2 |  |  | Total |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 58,344 |  |  | $ | — |  |  | $ | 58,344 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
Government and corporate debentures - fixed interest rate |  |  | — |  |  |  | 2,995,934 |  |  |  | 2,995,934 |
Government-sponsored enterprises debentures |  |  | — |  |  |  | 532,609 |  |  |  | 532,609 |
Government and corporate debentures - floating interest rate |  |  | — |  |  |  | 74,038 |  |  |  | 74,038 |
Foreign currency derivative contracts |  |  | — |  |  |  | 160 |  |  |  | 160 |
Total financial assets |  | $ | 58,344 |  |  | $ | 3,602,741 |  |  | $ | 3,661,085 |
|  | December 31, 2016 |
|  | Fair value measurements using input type |
|  | Level 1 |  |  | Level 2 |  |  | Total |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 38,072 |  |  | $ | — |  |  | $ | 38,072 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
Government and corporate debentures - fixed interest rate |  |  | — |  |  |  | 2,676,687 |  |  |  | 2,676,687 |
Government-sponsored enterprises debentures |  |  | — |  |  |  | 666,909 |  |  |  | 666,909 |
Government and corporate debentures - floating interest rate |  |  | — |  |  |  | 30,941 |  |  |  | 30,941 |
Foreign currency derivative contracts |  |  | — |  |  |  | 43 |  |  |  | 43 |
Total financial assets |  | $ | 38,072 |  |  | $ | 3,374,580 |  |  | $ | 3,412,652 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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