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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Fair value of certain financial assets and liabilities |  |  |  |
Cash and cash equivalents | $ 1,178,879 | $ 1,180,413 | $ 701,836 | $ 797,957
Short-term investments | 980,108 | 881,354 |  |
Investments | 63,751 | 44,291 |  |
Asset transfers between Level 1 and Level 2 measurements | 0 | 0 |  |
Total fair value |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Cash | 809,464 | 796,421 |  |
Assets measured at fair value | 2,222,444 | 2,103,480 |  |
Cash and cash equivalents | 1,178,879 | 1,180,413 |  |
Short-term investments | 980,108 | 881,354 |  |
Accounts receivable, net | 173 | 69 |  |
Investments | 63,751 | 44,291 |  |
Accrued liabilities | (467) | (2,647) |  |
Foreign currency derivatives | (292) | (2,578) |  |
Total fair value | Money market funds |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 351,514 | 352,730 |  |
Total fair value | Certificates of deposit |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 40,520 | 23,137 |  |
Total fair value | Commercial paper |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 166,306 | 130,883 |  |
Total fair value | Municipal securities |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value |  | 9,083 |  |
Total fair value | U.S. government agency securities |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 95,794 | 91,882 |  |
Total fair value | U.S. treasuries |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 759,138 | 701,922 |  |
Level 1 |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Cash | 809,464 | 796,421 |  |
Assets measured at fair value | 1,160,978 | 1,149,151 |  |
Cash and cash equivalents | 1,160,978 | 1,149,151 |  |
Level 1 | Money market funds |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 351,514 | 352,730 |  |
Level 2 |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 1,061,466 | 954,329 |  |
Cash and cash equivalents | 17,901 | 31,262 |  |
Short-term investments | 980,108 | 881,354 |  |
Accounts receivable, net | 173 | 69 |  |
Investments | 63,751 | 44,291 |  |
Accrued liabilities | (467) | (2,647) |  |
Foreign currency derivatives | (292) | (2,578) |  |
Level 2 | Certificates of deposit |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 40,520 | 23,137 |  |
Level 2 | Commercial paper |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 166,306 | 130,883 |  |
Level 2 | Municipal securities |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value |  | 9,083 |  |
Level 2 | U.S. government agency securities |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 95,794 | 91,882 |  |
Level 2 | U.S. treasuries |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | $ 759,138 | $ 701,922 |  |

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