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FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments Measured at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt securities: |  |
Estimated Fair Value | $ 162,074 | $ 173,008
Corporate debt securities |  |
Debt securities: |  |
Estimated Fair Value | 16,892 | 42,133
Commercial paper |  |
Debt securities: |  |
Estimated Fair Value | 18,922 | 20,743
U.S. government bonds |  |
Debt securities: |  |
Estimated Fair Value | 105,259 | 86,130
Certificate of deposits |  |
Debt securities: |  |
Estimated Fair Value | 9,986 | 21,507
Treasury bills |  |
Debt securities: |  |
Estimated Fair Value | 9,516 |
Fair Value, Recurring |  |
Debt securities: |  |
Total financial assets | 175,680 | 300,269
Fair Value, Recurring | Corporate debt securities |  |
Debt securities: |  |
Estimated Fair Value | 16,892 | 42,133
Fair Value, Recurring | Commercial paper |  |
Debt securities: |  |
Estimated Fair Value | 18,922 | 20,743
Fair Value, Recurring | U.S. government bonds |  |
Debt securities: |  |
Estimated Fair Value | 105,259 | 86,130
Fair Value, Recurring | Certificate of deposits |  |
Debt securities: |  |
Estimated Fair Value | 9,986 | 21,507
Fair Value, Recurring | Treasury bills |  |
Debt securities: |  |
Estimated Fair Value | 9,516 |
Fair Value, Recurring | Agency bonds |  |
Debt securities: |  |
Estimated Fair Value | 1,499 | 2,495
Fair Value, Recurring | Money market fund |  |
Cash equivalents: |  |
Cash equivalents | 10,618 | 127,261
Fair Value, Recurring | Commercial paper |  |
Cash equivalents: |  |
Cash equivalents | 2,988 |
Level 1 | Fair Value, Recurring |  |
Debt securities: |  |
Total financial assets | 10,618 | 127,261
Level 1 | Fair Value, Recurring | Corporate debt securities |  |
Debt securities: |  |
Estimated Fair Value | 0 | 0
Level 1 | Fair Value, Recurring | Commercial paper |  |
Debt securities: |  |
Estimated Fair Value | 0 | 0
Level 1 | Fair Value, Recurring | U.S. government bonds |  |
Debt securities: |  |
Estimated Fair Value | 0 | 0
Level 1 | Fair Value, Recurring | Certificate of deposits |  |
Debt securities: |  |
Estimated Fair Value | 0 | 0
Level 1 | Fair Value, Recurring | Treasury bills |  |
Debt securities: |  |
Estimated Fair Value | 0 |
Level 1 | Fair Value, Recurring | Agency bonds |  |
Debt securities: |  |
Estimated Fair Value | 0 | 0
Level 1 | Fair Value, Recurring | Money market fund |  |
Cash equivalents: |  |
Cash equivalents | 10,618 | 127,261
Level 1 | Fair Value, Recurring | Commercial paper |  |
Cash equivalents: |  |
Cash equivalents | 0 |
Level 2 | Convertible Notes |  |
Debt securities: |  |
Outstanding principal | 293,100 |
Level 2 | Fair Value, Recurring |  |
Debt securities: |  |
Total financial assets | 165,062 | 173,008
Level 2 | Fair Value, Recurring | Corporate debt securities |  |
Debt securities: |  |
Estimated Fair Value | 16,892 | 42,133
Level 2 | Fair Value, Recurring | Commercial paper |  |
Debt securities: |  |
Estimated Fair Value | 18,922 | 20,743
Level 2 | Fair Value, Recurring | U.S. government bonds |  |
Debt securities: |  |
Estimated Fair Value | 105,259 | 86,130
Level 2 | Fair Value, Recurring | Certificate of deposits |  |
Debt securities: |  |
Estimated Fair Value | 9,986 | 21,507
Level 2 | Fair Value, Recurring | Treasury bills |  |
Debt securities: |  |
Estimated Fair Value | 9,516 |
Level 2 | Fair Value, Recurring | Agency bonds |  |
Debt securities: |  |
Estimated Fair Value | 1,499 | 2,495
Level 2 | Fair Value, Recurring | Money market fund |  |
Cash equivalents: |  |
Cash equivalents | 0 | 0
Level 2 | Fair Value, Recurring | Commercial paper |  |
Cash equivalents: |  |
Cash equivalents | 2,988 |
Level 3 | Fair Value, Recurring |  |
Debt securities: |  |
Total financial assets | 0 | 0
Level 3 | Fair Value, Recurring | Corporate debt securities |  |
Debt securities: |  |
Estimated Fair Value | 0 | 0
Level 3 | Fair Value, Recurring | Commercial paper |  |
Debt securities: |  |
Estimated Fair Value | 0 | 0
Level 3 | Fair Value, Recurring | U.S. government bonds |  |
Debt securities: |  |
Estimated Fair Value | 0 | 0
Level 3 | Fair Value, Recurring | Certificate of deposits |  |
Debt securities: |  |
Estimated Fair Value | 0 | 0
Level 3 | Fair Value, Recurring | Treasury bills |  |
Debt securities: |  |
Estimated Fair Value | 0 |
Level 3 | Fair Value, Recurring | Agency bonds |  |
Debt securities: |  |
Estimated Fair Value | 0 | 0
Level 3 | Fair Value, Recurring | Money market fund |  |
Cash equivalents: |  |
Cash equivalents | 0 | $ 0
Level 3 | Fair Value, Recurring | Commercial paper |  |
Cash equivalents: |  |
Cash equivalents | $ 0 |

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