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INVESTMENTS - Summary of Fair Value of Investments Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2022
--- | --- | --- | ---
Assets: |  |  |
Short-term investments: | $ 40,651 | $ 58,268 |
Long-term investments: | 2,815 | 10,633 |
Total assets at fair value | 43,466 | 68,901 |
Liabilities: |  |  |
Acquisition-related contingent consideration | 8,013 | 5,920 | $ 5,900
Total liabilities at fair value | 8,013 | 5,920 |
U.S. Treasury |  |  |
Assets: |  |  |
Short-term investments: | 22,039 | 5,882 |
Long-term investments: | 1,296 | 3,221 |
Commercial paper |  |  |
Assets: |  |  |
Short-term investments: | 6,155 | 18,022 |
Foreign government and agency securities |  |  |
Assets: |  |  |
Short-term investments: |  | 2,827 |
Corporate debt securities |  |  |
Assets: |  |  |
Short-term investments: | 12,457 | 31,537 |
Long-term investments: | 1,519 | 7,412 |
Quoted Prices in Active Markets (Level 1) |  |  |
Assets: |  |  |
Short-term investments: | 22,039 | 5,882 |
Long-term investments: | 1,296 | 3,221 |
Total assets at fair value | 23,335 | 9,103 |
Liabilities: |  |  |
Acquisition-related contingent consideration | 0 | 0 |
Total liabilities at fair value | 0 | 0 |
Quoted Prices in Active Markets (Level 1) | U.S. Treasury |  |  |
Assets: |  |  |
Short-term investments: | 22,039 | 5,882 |
Long-term investments: | 1,296 | 3,221 |
Quoted Prices in Active Markets (Level 1) | Commercial paper |  |  |
Assets: |  |  |
Short-term investments: | 0 | 0 |
Quoted Prices in Active Markets (Level 1) | Foreign government and agency securities |  |  |
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 | 0 |
Significant Other Observable Inputs (Level 2) |  |  |
Assets: |  |  |
Short-term investments: | 18,612 | 52,386 |
Long-term investments: | 1,519 | 7,412 |
Total assets at fair value | 20,131 | 59,798 |
Liabilities: |  |  |
Acquisition-related contingent consideration | 8,013 | 0 |
Total liabilities at fair value | 8,013 | 0 |
Significant Other Observable Inputs (Level 2) | U.S. Treasury |  |  |
Assets: |  |  |
Short-term investments: | 0 | 0 |
Long-term investments: | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Commercial paper |  |  |
Assets: |  |  |
Short-term investments: | 6,155 | 18,022 |
Significant Other Observable Inputs (Level 2) | Foreign government and agency securities |  |  |
Assets: |  |  |
Short-term investments: |  | 2,827 |
Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |  |
Assets: |  |  |
Short-term investments: | 12,457 | 31,537 |
Long-term investments: | 1,519 | 7,412 |
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 | 0 | 5,920 |
Total liabilities at fair value | 0 | 5,920 |
Significant Unobservable Inputs (Level 3) | U.S. Treasury |  |  |
Assets: |  |  |
Short-term investments: | 0 | 0 |
Long-term investments: | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Commercial paper |  |  |
Assets: |  |  |
Short-term investments: | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Foreign government and agency securities |  |  |
Assets: |  |  |
Short-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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