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INVESTMENTS - Summary of Fair Value of Investments Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Assets: |  |
Short-term investments: | $ 74,700 | $ 58,268
Long-term investments: | 1,304 | 10,633
Total assets at fair value | 76,004 | 68,901
Current liabilities: |  |
Acquisition-related contingent consideration | 7,976 | 5,920
Total liabilities at fair value | 7,976 | 5,920
U.S. Treasury |  |
Assets: |  |
Short-term investments: | 40,254 | 5,882
Long-term investments: | 1,304 | 3,221
Corporate debt securities |  |
Assets: |  |
Short-term investments: | 34,446 | 31,537
Long-term investments: |  | 7,412
Commercial paper |  |
Assets: |  |
Short-term investments: |  | 18,022
Foreign government and agency securities |  |
Assets: |  |
Short-term investments: |  | 2,827
Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Short-term investments: | 40,254 | 5,882
Long-term investments: | 1,304 | 3,221
Total assets at fair value | 41,558 | 9,103
Current 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: | 40,254 | 5,882
Long-term investments: | 1,304 | 3,221
Quoted Prices in Active Markets (Level 1) | Corporate debt securities |  |
Assets: |  |
Short-term investments: | 0 | 0
Long-term investments: |  | 0
Quoted Prices in Active Markets (Level 1) | Commercial paper |  |
Assets: |  |
Short-term investments: |  | 0
Quoted Prices in Active Markets (Level 1) | Foreign government and agency securities |  |
Assets: |  |
Short-term investments: |  | 0
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Short-term investments: | 34,446 | 52,386
Long-term investments: | 0 | 7,412
Total assets at fair value | 34,446 | 59,798
Current liabilities: |  |
Acquisition-related contingent consideration | 7,976 | 0
Total liabilities at fair value | 7,976 | 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) | Corporate debt securities |  |
Assets: |  |
Short-term investments: | 34,446 | 31,537
Long-term investments: |  | 7,412
Significant Other Observable Inputs (Level 2) | Commercial paper |  |
Assets: |  |
Short-term investments: |  | 18,022
Significant Other Observable Inputs (Level 2) | Foreign government and agency securities |  |
Assets: |  |
Short-term investments: |  | 2,827
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Short-term investments: | 0 | 0
Long-term investments: | 0 | 0
Total assets at fair value | 0 | 0
Current 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) | Corporate debt securities |  |
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) | Foreign government and agency securities |  |
Assets: |  |
Short-term investments: |  | $ 0

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