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INVESTMENTS - Fair Value of Investments Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Assets: |  |
Short-term investments: | $ 38,718 | $ 74,700
Long-term investments: | 10,157 | 1,304
Total assets at fair value | 48,875 | 76,004
Liabilities: |  |
Acquisition-related contingent consideration | 0 | 7,976
Total liabilities at fair value |  | 7,976
U.S. Treasury |  |
Assets: |  |
Short-term investments: | 3,790 | 40,254
Long-term investments: |  | 1,304
Commercial paper |  |
Assets: |  |
Short-term investments: | 15,711 |
U.S. Government and agency securities, short-term |  |
Assets: |  |
Short-term investments: | 6,718 |
Corporate debt securities |  |
Assets: |  |
Short-term investments: | 12,499 | 34,446
Long-term investments: | 10,157 |
Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Short-term investments: | 3,790 | 40,254
Long-term investments: | 0 | 1,304
Total assets at fair value | 3,790 | 41,558
Liabilities: |  |
Acquisition-related contingent consideration |  | 0
Total liabilities at fair value |  | 0
Quoted Prices in Active Markets (Level 1) | U.S. Treasury |  |
Assets: |  |
Short-term investments: | 3,790 | 40,254
Long-term investments: |  | 1,304
Quoted Prices in Active Markets (Level 1) | Commercial paper |  |
Assets: |  |
Short-term investments: | 0 |
Quoted Prices in Active Markets (Level 1) | U.S. Government and agency securities, short-term |  |
Assets: |  |
Short-term investments: | 0 |
Quoted Prices in Active Markets (Level 1) | Corporate debt securities |  |
Assets: |  |
Short-term investments: | 0 | 0
Long-term investments: | 0 |
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Short-term investments: | 34,928 | 34,446
Long-term investments: | 10,157 | 0
Total assets at fair value | 45,085 | 34,446
Liabilities: |  |
Acquisition-related contingent consideration |  | 7,976
Total liabilities at fair value |  | 7,976
Significant Other Observable Inputs (Level 2) | U.S. Treasury |  |
Assets: |  |
Short-term investments: | 0 | 0
Long-term investments: |  | 0
Significant Other Observable Inputs (Level 2) | Commercial paper |  |
Assets: |  |
Short-term investments: | 15,711 |
Significant Other Observable Inputs (Level 2) | U.S. Government and agency securities, short-term |  |
Assets: |  |
Short-term investments: | 6,718 |
Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |
Assets: |  |
Short-term investments: | 12,499 | 34,446
Long-term investments: | 10,157 |
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Short-term investments: | 0 | 0
Long-term investments: | 0 | 0
Total assets at fair value | 0 | 0
Liabilities: |  |
Acquisition-related contingent consideration |  |
Total liabilities at fair value |  | 0
Significant Unobservable Inputs (Level 3) | U.S. Treasury |  |
Assets: |  |
Short-term investments: | 0 | 0
Long-term investments: |  | 0
Significant Unobservable Inputs (Level 3) | Commercial paper |  |
Assets: |  |
Short-term investments: | 0 |
Significant Unobservable Inputs (Level 3) | U.S. Government and agency securities, short-term |  |
Assets: |  |
Short-term investments: | 0 |
Significant Unobservable Inputs (Level 3) | Corporate debt securities |  |
Assets: |  |
Short-term investments: | 0 | $ 0
Long-term investments: | $ 0 |

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