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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair value of certain financial assets and liabilities |  |  |  |
Cash and cash equivalents | $ 797,957 | $ 637,513 | $ 528,622 | $ 377,582
Short-term investments | 533,063 | 320,650 |  |
Investments | 12,905 |  |  |
Asset transfers between Level 1 and Level 2 measurements | 0 | 0 |  |
Total fair value |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Cash | 518,178 | 393,936 |  |
Foreign currency derivatives | 687 |  |  |
Assets measured at fair value | 1,343,238 | 957,671 |  |
Cash and cash equivalents | 797,957 | 637,513 |  |
Short-term investments | 533,063 | 320,650 |  |
Accounts receivable, net | 329 | 43 |  |
Investments | 12,905 |  |  |
Accrued liabilities | (1,016) | (535) |  |
Foreign currency derivatives |  | (492) |  |
Total fair value | Money market funds |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 191,131 | 191,358 |  |
Total fair value | Certificates of deposit |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 28,049 | 14,075 |  |
Total fair value | Commercial paper |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 96,867 | 60,422 |  |
Total fair value | Variable rate demand notes |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 21,680 | 4,005 |  |
Total fair value | Municipal securities |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 167,224 | 177,118 |  |
Total fair value | U.S. government agency securities |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 73,634 | 39,092 |  |
Total fair value | U.S. treasuries |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 247,162 | 78,157 |  |
Level 1 |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Cash | 518,178 | 393,936 |  |
Assets measured at fair value | 709,309 | 585,294 |  |
Cash and cash equivalents | 709,309 | 585,294 |  |
Level 1 | Money market funds |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 191,131 | 191,358 |  |
Level 2 |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Foreign currency derivatives | 687 |  |  |
Assets measured at fair value | 633,929 | 372,377 |  |
Cash and cash equivalents | 88,648 | 52,219 |  |
Short-term investments | 533,063 | 320,650 |  |
Accounts receivable, net | 329 | 43 |  |
Investments | 12,905 |  |  |
Accrued liabilities | (1,016) | (535) |  |
Foreign currency derivatives |  | (492) |  |
Level 2 | Certificates of deposit |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 28,049 | 14,075 |  |
Level 2 | Commercial paper |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 96,867 | 60,422 |  |
Level 2 | Variable rate demand notes |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 21,680 | 4,005 |  |
Level 2 | Municipal securities |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 167,224 | 177,118 |  |
Level 2 | U.S. government agency securities |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | 73,634 | 39,092 |  |
Level 2 | U.S. treasuries |  |  |  |
Fair value of certain financial assets and liabilities |  |  |  |
Assets measured at fair value | $ 247,162 | $ 78,157 |  |

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