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FAIR VALUE MEASUREMENTS - Change in Investment in Privately Held Companies (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Feb. 29, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Convertible debt fair value | $ 680,000,000 | $ 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 |
New investments | 3,006,000 |
Sales of investments | (1,424,000) |
Fair value adjustment | 1,474,000 |
Ending balance | $ 7,927,000 |

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