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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Marketable debt securities | $ 49,995,000 | $ 0
Total | 751,725,000 | 314,850,000
Quoted Market Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Total | 374,014,000 | 291,810,000
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Total | 377,711,000 | 23,040,000
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Total | 0 | 0
Money market funds |  |
Assets: |  |
Cash equivalents | 374,014,000 | 291,810,000
Money market funds | Quoted Market Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash equivalents | 374,014,000 | 291,810,000
Money market funds | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash equivalents | 0 | 0
Money market funds | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash equivalents | 0 | 0
Treasury discount notes |  |
Assets: |  |
Cash equivalents | 324,995,000 |
Marketable debt securities | 49,995,000 |
Treasury discount notes | Quoted Market Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash equivalents | 0 |
Marketable debt securities | 0 |
Treasury discount notes | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash equivalents | 324,995,000 |
Marketable debt securities | 49,995,000 |
Treasury discount notes | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash equivalents | 0 |
Marketable debt securities | 0 |
Time deposits |  |
Assets: |  |
Cash equivalents | 2,721,000 | 23,040,000
Time deposits | Quoted Market Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash equivalents | 0 | 0
Time deposits | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash equivalents | 2,721,000 | 23,040,000
Time deposits | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash equivalents | $ 0 | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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