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INVESTMENTS (Tables) | 12 Months Ended
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Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investments by Type of Security | The following tables summarize investments by type of security as of September 30, 2023 and 2022, respectively (amounts in thousands):
September 30, 2023: | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Available-for-sale securities: |  |  |  |  |  |  |
U.S. Treasury, short-term | $ | 40,329 |  |  | $ | 1 |  |  | $ | (76) |  |  | $ | 40,254 |
Corporate debt securities, short-term | 34,545 |  |  | — |  |  | (99) |  |  | 34,446 |
U.S. Treasury, long-term | 1,371 |  |  | — |  |  | (67) |  |  | 1,304 |
Total | $ | 76,245 |  |  | $ | 1 |  |  | $ | (242) |  |  | $ | 76,004 |
September 30, 2022: | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Available-for-sale securities: |  |  |  |  |  |  |
U.S. Treasury, short-term | $ | 6,016 |  |  | $ | — |  |  | $ | (134) |  |  | $ | 5,882 |
Foreign government and agency securities, short-term | 2,865 |  |  | — |  |  | (38) |  |  | $ | 2,827 |
Commercial paper, short-term | 18,245 |  |  | — |  |  | (223) |  |  | 18,022 |
Corporate debt securities, short-term | 32,065 |  |  | — |  |  | (528) |  |  | 31,537 |
U.S. Treasury, long-term | 3,431 |  |  | — |  |  | (210) |  |  | 3,221 |
Corporate debt securities, long-term | 7,692 |  |  | — |  |  | (280) |  |  | 7,412 |
Total | $ | 70,314 |  |  | $ | — |  |  | $ | (1,413) |  |  | $ | 68,901 |
Schedule of Fair Value of Investments Measured on Recurring Basis | The following tables represent the fair value hierarchy of the Company’s investments and acquisition-related contingent consideration as of September 30, 2023 and 2022, respectively (amounts in thousands):
September 30, 2023 | Balance |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |
Short-term investments: |  |  |  |  |  |  |
U.S. Treasury | $ | 40,254 |  |  | $ | 40,254 |  |  | $ | — |  |  | $ | — |
Corporate debt securities | 34,446 |  |  | — |  |  | 34,446 |  |  | — |
Total short-term investments at fair value | 74,700 |  |  | 40,254 |  |  | 34,446 |  |  | — |
Long-term investments: |  |  |  |  |  |  |
U.S. Treasury | 1,304 |  |  | 1,304 |  |  | — |  |  | — |
Total long-term investments at fair value | 1,304 |  |  | 1,304 |  |  | — |  |  | — |
Total assets at fair value | $ | 76,004 |  |  | $ | 41,558 |  |  | $ | 34,446 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |
Acquisition-related contingent consideration | $ | 7,976 |  |  | $ | — |  |  | $ | 7,976 |  |  | $ | — |
Total liabilities at fair value | $ | 7,976 |  |  | $ | — |  |  | $ | 7,976 |  |  | $ | — |
September 30, 2022 | Balance |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |
Short-term investments: |  |  |  |  |  |  |
U.S. Treasury | $ | 5,882 |  |  | $ | 5,882 |  |  | $ | — |  |  | $ | — |
Commercial paper | 18,022 |  |  | — |  |  | 18,022 |  |  | — |
Foreign government and agency securities | 2,827 |  |  | — |  |  | 2,827 |  |  | — |
Corporate debt securities | 31,537 |  |  | — |  |  | 31,537 |  |  | — |
Total short-term investments at fair value | 58,268 |  |  | 5,882 |  |  | 52,386 |  |  | — |
Long-term investments: |  |  |  |  |  |  |
U.S. Treasury | 3,221 |  |  | 3,221 |  |  | — |  |  | — |
Corporate debt securities | 7,412 |  |  | — |  |  | 7,412 |  |  | — |
Total long-term investments at fair value | 10,633 |  |  | 3,221 |  |  | 7,412 |  |  | — |
Total assets at fair value | $ | 68,901 |  |  | $ | 9,103 |  |  | $ | 59,798 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |
Acquisition-related contingent consideration | $ | 5,920 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,920 |
Total liabilities at fair value | $ | 5,920 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,920 |
Schedule of Acquisition-related Contingent Consideration Measured at Fair Value | The following table includes a roll-forward of the contingent consideration liability during the twelve months ended September 30, 2023 (amounts in thousands):
Balance at September 30, 2022 | $ | 5,920 |
Expenses recorded due to changes in fair value | 2,056 |
Balance at September 30, 2023 | $ | 7,976 |
Schedule of Fair Value Measurement Inputs and Valuation Techniques | The following tables summarize the quantitative information including the unobservable inputs related to our acquisition-related contingent consideration as of September 30, 2022 (amounts in thousands):
| Fair Value at September 30, 2022 |  | Valuation Technique |  | Unobservable Input |  | Input Used
Acquisition-related contingent consideration | $ | 5,920 |  |  | Monte Carlo simulation |  | Weighted-average cost of capital |  | 14.80 | %
|  |  |  | Revenue weight-average cost of capital |  | 4.40 | %
|  |  |  | Revenue volatility |  | 0.20

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