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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Fair value of certain financial assets and liabilities |  |  |  |
Cash and cash equivalents | $ 1,584,239 | $ 1,180,413 | $ 921,326 | $ 797,957
Short-term investments | 968,952 | 881,354 |  |
Investments | 91,033 | 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 | 760,217 | 796,421 |  |
Assets measured at fair value | 2,644,515 | 2,103,480 |  |
Cash and cash equivalents | 1,584,239 | 1,180,413 |  |
Short-term investments | 968,952 | 881,354 |  |
Accounts receivable, net | 609 | 69 |  |
Investments | 91,033 | 44,291 |  |
Accrued liabilities | (318) | (2,647) |  |
Foreign currency derivatives | 291 | (2,578) |  |
Total fair value | Money market funds |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 809,022 | 352,730 |  |
Total fair value | Certificates of deposit |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 43,242 | 23,137 |  |
Total fair value | Commercial paper |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 186,912 | 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 | 94,573 | 91,882 |  |
Total fair value | U.S. treasuries |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 750,258 | 701,922 |  |
Level 1 |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Cash | 760,217 | 796,421 |  |
Assets measured at fair value | 1,569,239 | 1,149,151 |  |
Cash and cash equivalents | 1,569,239 | 1,149,151 |  |
Level 1 | Money market funds |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 809,022 | 352,730 |  |
Level 2 |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 1,075,276 | 954,329 |  |
Cash and cash equivalents | 15,000 | 31,262 |  |
Short-term investments | 968,952 | 881,354 |  |
Accounts receivable, net | 609 | 69 |  |
Investments | 91,033 | 44,291 |  |
Accrued liabilities | (318) | (2,647) |  |
Foreign currency derivatives | 291 | (2,578) |  |
Level 2 | Certificates of deposit |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 43,242 | 23,137 |  |
Level 2 | Commercial paper |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 186,912 | 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 | 94,573 | 91,882 |  |
Level 2 | U.S. treasuries |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | $ 750,258 | $ 701,922 |  |

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