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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value Assets |  |
Marketable securities | $ 269,650 | $ 293,269
Capped call transactions | 64,480 | 83,597
Cash equivalents |  |
Fair Value Assets |  |
Cash equivalents | 26,657 | 56,339
Venture investments |  |
Fair Value Assets |  |
Venture investments | 9,756 | 8,345
Level 1 |  |
Fair Value Assets |  |
Marketable securities | 0 | 0
Capped call transactions | 0 | 0
Level 1 | Cash equivalents |  |
Fair Value Assets |  |
Cash equivalents | 26,657 | 42,339
Level 1 | Venture investments |  |
Fair Value Assets |  |
Venture investments | 0 | 0
Level 2 |  |
Fair Value Assets |  |
Marketable securities | 269,650 | 293,269
Capped call transactions | 64,480 | 83,597
Level 2 | Cash equivalents |  |
Fair Value Assets |  |
Cash equivalents | 0 | 14,000
Level 2 | Venture investments |  |
Fair Value Assets |  |
Venture investments | 0 | 0
Level 3 |  |
Fair Value Assets |  |
Marketable securities | 0 | 0
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 | $ 9,756 | $ 8,345

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