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FAIR VALUE MEASUREMENTS (Details) - USD ($) | Mar. 31, 2020 | Feb. 29, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Fair Value Assets |  |  |
Capped call transactions | $ 33,308,000 |  | $ 0
Convertible debt fair value | 533,000,000 | $ 515,900,000 |
Convertible Debt |  |  |
Fair Value Assets |  |  |
Capped call transactions |  | 51,900,000 |
Face amount |  | $ 600,000,000 |
Cash equivalents |  |  |
Fair Value Assets |  |  |
Cash equivalents | 460,475,000 |  | 0
Investments in privately-held companies |  |  |
Fair Value Assets |  |  |
Investments in privately-held companies | 6,338,000 |  | 4,871,000
Level 1 |  |  |
Fair Value Assets |  |  |
Capped call transactions | 0 |  | 0
Level 1 | Cash equivalents |  |  |
Fair Value Assets |  |  |
Cash equivalents | 460,475,000 |  | 0
Level 1 | Investments in privately-held companies |  |  |
Fair Value Assets |  |  |
Investments in privately-held companies | 0 |  | 0
Level 2 |  |  |
Fair Value Assets |  |  |
Capped call transactions | 33,308,000 |  | 0
Level 2 | Cash equivalents |  |  |
Fair Value Assets |  |  |
Cash equivalents | 0 |  | 0
Level 2 | Investments in privately-held companies |  |  |
Fair Value Assets |  |  |
Investments in privately-held companies | 0 |  | 0
Level 3 |  |  |
Fair Value Assets |  |  |
Capped call transactions | 0 |  | 0
Level 3 | Cash equivalents |  |  |
Fair Value Assets |  |  |
Cash equivalents | 0 |  | 0
Level 3 | Investments in privately-held companies |  |  |
Fair Value Assets |  |  |
Investments in privately-held companies | $ 6,338,000 |  | $ 4,871,000

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