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FAIR VALUE MEASUREMENTS - Change in Investment in Privately Held Companies (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Feb. 29, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Convertible debt fair value | $ 706,500,000 |  | $ 515,900,000
Convertible debt |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Face amount |  |  | $ 600,000,000
Privately held investment |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Beginning balance | 4,871,000 | $ 3,390,000 |
New investments | 3,306,000 | 1,444,000 |
Sales of investments | (1,424,000) | 0 |
Changes in foreign exchange rates | 118,000 | 37,000 |
Fair value adjustment | 1,474,000 | 0 |
Ending balance | $ 8,345,000 | $ 4,871,000 |

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