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FAIR VALUE MEASUREMENTS - RECURRING BASIS (Details) - Recurring basis - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value on a Recurring Basis |  |
Total | $ 254,454 | $ 156,382
Money market funds |  |
Fair Value on a Recurring Basis |  |
Total | 4,356 | 6,671
U.S. Treasury securities |  |
Fair Value on a Recurring Basis |  |
Total | 10,705 |
Government-sponsored enterprise securities |  |
Fair Value on a Recurring Basis |  |
Total | 28,757 | 13,512
Commercial paper |  |
Fair Value on a Recurring Basis |  |
Total | 112,409 | 44,130
Corporate notes |  |
Fair Value on a Recurring Basis |  |
Total | 97,866 | 91,680
Equity Investment |  |
Fair Value on a Recurring Basis |  |
Total | 361 | 389
Level 1 |  |
Fair Value on a Recurring Basis |  |
Total | 4,356 | 6,671
Level 1 | Money market funds |  |
Fair Value on a Recurring Basis |  |
Total | 4,356 | 6,671
Level 2 |  |
Fair Value on a Recurring Basis |  |
Total | 250,098 | 149,711
Level 2 | U.S. Treasury securities |  |
Fair Value on a Recurring Basis |  |
Total | 10,705 |
Level 2 | Government-sponsored enterprise securities |  |
Fair Value on a Recurring Basis |  |
Total | 28,757 | 13,512
Level 2 | Commercial paper |  |
Fair Value on a Recurring Basis |  |
Total | 112,409 | 44,130
Level 2 | Corporate notes |  |
Fair Value on a Recurring Basis |  |
Total | 97,866 | 91,680
Level 2 | Equity Investment |  |
Fair Value on a Recurring Basis |  |
Total | $ 361 | $ 389

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