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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Schedule of Debt Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Debt and Equity Securities, FV-NI [Line Items] |  |
Total debt investments | $ 493,330 | $ 252,946
Cash and cash equivalents: |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total debt investments | 284,442 | 52,794
Cash and cash equivalents: | Level 1 | Money market funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total debt investments | 284,442 | 52,794
Short-term investments: |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total debt investments | 208,888 | 200,152
Short-term investments: | Level 1 | U.S. government securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total debt investments | 45,403 | 19,075
Short-term investments: | Level 2 | Corporate bonds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total debt investments | 150,671 | 171,117
Short-term investments: | Level 2 | Asset-backed securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total debt investments | $ 12,814 | $ 9,960

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