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FAIR VALUE MEASUREMENTS - RECURRING BASIS (Details) - Recurring basis - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value on a Recurring Basis |  |
Total | $ 209,208 | $ 254,454
Money market funds |  |
Fair Value on a Recurring Basis |  |
Total | 24,207 | 4,356
U.S. Treasury securities |  |
Fair Value on a Recurring Basis |  |
Total | 17,088 | 10,705
Municipal securities |  |
Fair Value on a Recurring Basis |  |
Total | 2,985 |
Government-sponsored enterprise securities |  |
Fair Value on a Recurring Basis |  |
Total | 12,493 | 28,757
Commercial paper |  |
Fair Value on a Recurring Basis |  |
Total | 91,861 | 112,409
Corporate notes |  |
Fair Value on a Recurring Basis |  |
Total | 60,574 | 97,866
Equity investment |  |
Fair Value on a Recurring Basis |  |
Total |  | 361
Level 1 |  |
Fair Value on a Recurring Basis |  |
Total | 24,207 | 4,356
Level 1 | Money market funds |  |
Fair Value on a Recurring Basis |  |
Total | 24,207 | 4,356
Level 2 |  |
Fair Value on a Recurring Basis |  |
Total | 185,001 | 250,098
Level 2 | U.S. Treasury securities |  |
Fair Value on a Recurring Basis |  |
Total | 17,088 | 10,705
Level 2 | Municipal securities |  |
Fair Value on a Recurring Basis |  |
Total | 2,985 |
Level 2 | Government-sponsored enterprise securities |  |
Fair Value on a Recurring Basis |  |
Total | 12,493 | 28,757
Level 2 | Commercial paper |  |
Fair Value on a Recurring Basis |  |
Total | 91,861 | 112,409
Level 2 | Corporate notes |  |
Fair Value on a Recurring Basis |  |
Total | $ 60,574 | 97,866
Level 2 | Equity investment |  |
Fair Value on a Recurring Basis |  |
Total |  | $ 361

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