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FAIR VALUE MEASUREMENT - Fair Value of Investments Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Assets: |  |
Short-term investments: | $ 39,947 | $ 36,884
Long-term investments: | 8,304 | 11,410
Total assets at fair value | 48,251 | 48,294
U.S. Treasury |  |
Assets: |  |
Short-term investments: |  | 3,836
Commercial paper |  |
Assets: |  |
Short-term investments: | 17,274 | 15,984
U.S. Government and agency securities, short-term |  |
Assets: |  |
Short-term investments: | 1,488 |
U.S. Government and agency securities, long-term | Long Term Investments |  |
Assets: |  |
Long-term investments: | 499 |
Corporate debt securities |  |
Assets: |  |
Short-term investments: | 21,185 | 17,064
Long-term investments: | 7,805 | 11,410
Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Short-term investments: | 0 | 0
Long-term investments: | 0 | 0
Total assets at fair value | 0 | 0
Quoted Prices in Active Markets (Level 1) | U.S. Treasury |  |
Assets: |  |
Short-term investments: |  | 0
Quoted Prices in Active Markets (Level 1) | Commercial paper |  |
Assets: |  |
Short-term investments: | 0 | 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) | U.S. Government and agency securities, long-term | Long Term Investments |  |
Assets: |  |
Long-term investments: | 0 |
Quoted Prices in Active Markets (Level 1) | Corporate debt securities |  |
Assets: |  |
Short-term investments: | 0 | 0
Long-term investments: | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Short-term investments: | 39,947 | 36,884
Long-term investments: | 8,304 | 11,410
Total assets at fair value | 48,251 | 48,294
Significant Other Observable Inputs (Level 2) | U.S. Treasury |  |
Assets: |  |
Short-term investments: |  | 3,836
Significant Other Observable Inputs (Level 2) | Commercial paper |  |
Assets: |  |
Short-term investments: | 17,274 | 15,984
Significant Other Observable Inputs (Level 2) | U.S. Government and agency securities, short-term |  |
Assets: |  |
Short-term investments: | 1,488 |
Significant Other Observable Inputs (Level 2) | U.S. Government and agency securities, long-term | Long Term Investments |  |
Assets: |  |
Long-term investments: | 499 |
Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |
Assets: |  |
Short-term investments: | 21,185 | 17,064
Long-term investments: | 7,805 | 11,410
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Short-term investments: | 0 | 0
Long-term investments: | 0 | 0
Total assets at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | U.S. Treasury |  |
Assets: |  |
Short-term investments: |  | 0
Significant Unobservable Inputs (Level 3) | Commercial paper |  |
Assets: |  |
Short-term investments: | 0 | 0
Significant Unobservable Inputs (Level 3) | U.S. Government and agency securities, short-term |  |
Assets: |  |
Short-term investments: | 0 |
Significant Unobservable Inputs (Level 3) | U.S. Government and agency securities, long-term | Long Term Investments |  |
Assets: |  |
Long-term investments: | 0 |
Significant Unobservable Inputs (Level 3) | Corporate debt securities |  |
Assets: |  |
Short-term investments: | 0 | 0
Long-term investments: | $ 0 | $ 0

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