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FAIR VALUE MEASUREMENTS - RECURRING BASIS (Details) - Recurring basis - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value on a Recurring Basis |  |
Total | $ 173,866 | $ 209,208
Money market funds |  |
Fair Value on a Recurring Basis |  |
Total | 15,327 | 24,207
U.S. Treasury securities |  |
Fair Value on a Recurring Basis |  |
Total | 20,543 | 17,088
Municipal securities |  |
Fair Value on a Recurring Basis |  |
Total | 2,947 | 2,985
Government-sponsored enterprise securities |  |
Fair Value on a Recurring Basis |  |
Total | 6,461 | 12,493
Commercial paper |  |
Fair Value on a Recurring Basis |  |
Total | 77,200 | 91,861
Corporate notes |  |
Fair Value on a Recurring Basis |  |
Total | 51,388 | 60,574
Level 1 |  |
Fair Value on a Recurring Basis |  |
Total | 15,327 | 24,207
Level 1 | Money market funds |  |
Fair Value on a Recurring Basis |  |
Total | 15,327 | 24,207
Level 2 |  |
Fair Value on a Recurring Basis |  |
Total | 158,539 | 185,001
Level 2 | U.S. Treasury securities |  |
Fair Value on a Recurring Basis |  |
Total | 20,543 | 17,088
Level 2 | Municipal securities |  |
Fair Value on a Recurring Basis |  |
Total | 2,947 | 2,985
Level 2 | Government-sponsored enterprise securities |  |
Fair Value on a Recurring Basis |  |
Total | 6,461 | 12,493
Level 2 | Commercial paper |  |
Fair Value on a Recurring Basis |  |
Total | 77,200 | 91,861
Level 2 | Corporate notes |  |
Fair Value on a Recurring Basis |  |
Total | $ 51,388 | $ 60,574

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