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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value Assets |  |
Capped call transactions | $ 52,727 | $ 0
Cash equivalents |  |
Fair Value Assets |  |
Cash equivalents | 450,465 | 0
Venture Investments |  |
Fair Value Assets |  |
Venture investments | 6,640 | 4,871
Level 1 |  |
Fair Value Assets |  |
Capped call transactions | 0 | 0
Level 1 | Cash equivalents |  |
Fair Value Assets |  |
Cash equivalents | 450,465 | 0
Level 1 | Venture Investments |  |
Fair Value Assets |  |
Venture investments | 0 | 0
Level 2 |  |
Fair Value Assets |  |
Capped call transactions | 52,727 | 0
Level 2 | Cash equivalents |  |
Fair Value Assets |  |
Cash equivalents | 0 | 0
Level 2 | Venture Investments |  |
Fair Value Assets |  |
Venture investments | 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 | Venture Investments |  |
Fair Value Assets |  |
Venture investments | $ 6,640 | $ 4,871

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