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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Cash equivalents |  | $ 314,850,000
Marketable debt securities | $ 49,992,000 | 0
Cash equivalents, and marketable securities | 796,969,000 |
Treasury discount notes |  |
Assets: |  |
Marketable debt securities | 49,992,000 |
Money market funds |  |
Assets: |  |
Cash equivalents | 269,013,000 | 291,810,000
Treasury discount notes |  |
Assets: |  |
Cash equivalents | 474,976,000 |
Time deposits |  |
Assets: |  |
Cash equivalents | 2,988,000 | 23,040,000
Quoted Market Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash equivalents |  | 291,810,000
Cash equivalents, and marketable securities | 269,013,000 |
Quoted Market Prices in Active Markets for Identical Assets (Level 1) | Treasury discount notes |  |
Assets: |  |
Marketable debt securities | 0 |
Quoted Market Prices in Active Markets for Identical Assets (Level 1) | Money market funds |  |
Assets: |  |
Cash equivalents | 269,013,000 | 291,810,000
Quoted Market Prices in Active Markets for Identical Assets (Level 1) | Treasury discount notes |  |
Assets: |  |
Cash equivalents | 0 |
Quoted Market Prices in Active Markets for Identical Assets (Level 1) | Time deposits |  |
Assets: |  |
Cash equivalents | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash equivalents |  | 23,040,000
Cash equivalents, and marketable securities | 527,956,000 |
Significant Other Observable Inputs (Level 2) | Treasury discount notes |  |
Assets: |  |
Marketable debt securities | 49,992,000 |
Significant Other Observable Inputs (Level 2) | Money market funds |  |
Assets: |  |
Cash equivalents | 0 | 0
Significant Other Observable Inputs (Level 2) | Treasury discount notes |  |
Assets: |  |
Cash equivalents | 474,976,000 |
Significant Other Observable Inputs (Level 2) | Time deposits |  |
Assets: |  |
Cash equivalents | 2,988,000 | 23,040,000
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash equivalents |  | 0
Cash equivalents, and marketable securities | 0 |
Significant Unobservable Inputs (Level 3) | Treasury discount notes |  |
Assets: |  |
Marketable debt securities | 0 |
Significant Unobservable Inputs (Level 3) | Money market funds |  |
Assets: |  |
Cash equivalents | 0 | 0
Significant Unobservable Inputs (Level 3) | Treasury discount notes |  |
Assets: |  |
Cash equivalents | 0 |
Significant Unobservable Inputs (Level 3) | Time deposits |  |
Assets: |  |
Cash equivalents | $ 0 | $ 0

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