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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Schedule of Debt Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Debt and Equity Securities, FV-NI [Line Items] |  |
Total debt investments | $ 416,766 | $ 438,533
Cash and cash equivalents: |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total debt investments | 217,131 | 18,828
Cash and cash equivalents: | Level 1 | Money market funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total debt investments | 217,131 | 18,828
Short-term investments: |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total debt investments | 199,635 | 419,705
Short-term investments: | Level 1 | U.S. government securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total debt investments | 5,978 | 37,805
Short-term investments: | Level 2 | U.S. agency securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total debt investments | 0 | 9,804
Short-term investments: | Level 2 | Corporate bonds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total debt investments | 189,242 | 364,926
Short-term investments: | Level 2 | Asset-backed securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total debt investments | $ 4,415 | $ 7,170

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