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FAIR VALUE MEASUREMENTS - RECURRING BASIS (Details) - Recurring basis - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value on a Recurring Basis |  |
Total | $ 211,251 | $ 254,454
Money market funds |  |
Fair Value on a Recurring Basis |  |
Total | 19,805 | 4,356
U.S. Treasury securities |  |
Fair Value on a Recurring Basis |  |
Total | 21,160 | 10,705
Municipal securities |  |
Fair Value on a Recurring Basis |  |
Total | 2,999 |
Government-sponsored enterprise securities |  |
Fair Value on a Recurring Basis |  |
Total | 16,249 | 28,757
Commercial paper |  |
Fair Value on a Recurring Basis |  |
Total | 77,440 | 112,409
Corporate notes |  |
Fair Value on a Recurring Basis |  |
Total | 73,598 | 97,866
Equity Investment |  |
Fair Value on a Recurring Basis |  |
Total |  | 361
Level 1 |  |
Fair Value on a Recurring Basis |  |
Total | 19,805 | 4,356
Level 1 | Money market funds |  |
Fair Value on a Recurring Basis |  |
Total | 19,805 | 4,356
Level 2 |  |
Fair Value on a Recurring Basis |  |
Total | 191,446 | 250,098
Level 2 | U.S. Treasury securities |  |
Fair Value on a Recurring Basis |  |
Total | 21,160 | 10,705
Level 2 | Municipal securities |  |
Fair Value on a Recurring Basis |  |
Total | 2,999 |
Level 2 | Government-sponsored enterprise securities |  |
Fair Value on a Recurring Basis |  |
Total | 16,249 | 28,757
Level 2 | Commercial paper |  |
Fair Value on a Recurring Basis |  |
Total | 77,440 | 112,409
Level 2 | Corporate notes |  |
Fair Value on a Recurring Basis |  |
Total | $ 73,598 | 97,866
Level 2 | Equity Investment |  |
Fair Value on a Recurring Basis |  |
Total |  | $ 361

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