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FAIR VALUE MEASUREMENTS - RECURRING BASIS (Details) - Recurring basis - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value on a Recurring Basis |  |
Total | $ 263,400 | $ 156,382
Money market funds |  |
Fair Value on a Recurring Basis |  |
Total | 12,629 | 6,671
Government-sponsored enterprise securities |  |
Fair Value on a Recurring Basis |  |
Total | 9,509 | 13,512
Commercial paper |  |
Fair Value on a Recurring Basis |  |
Total | 105,242 | 44,130
Corporate notes |  |
Fair Value on a Recurring Basis |  |
Total | 135,352 | 91,680
Equity Investment |  |
Fair Value on a Recurring Basis |  |
Total | 668 | 389
Level 1 |  |
Fair Value on a Recurring Basis |  |
Total | 12,629 | 6,671
Level 1 | Money market funds |  |
Fair Value on a Recurring Basis |  |
Total | 12,629 | 6,671
Level 2 |  |
Fair Value on a Recurring Basis |  |
Total | 250,771 | 149,711
Level 2 | Government-sponsored enterprise securities |  |
Fair Value on a Recurring Basis |  |
Total | 9,509 | 13,512
Level 2 | Commercial paper |  |
Fair Value on a Recurring Basis |  |
Total | 105,242 | 44,130
Level 2 | Corporate notes |  |
Fair Value on a Recurring Basis |  |
Total | 135,352 | 91,680
Level 2 | Equity Investment |  |
Fair Value on a Recurring Basis |  |
Total | $ 668 | $ 389

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