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INVESTMENTS (Tables) | 6 Months Ended
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Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investments by Type of Security | The following tables summarize investments by type of security as of March 31, 2024 and September 30, 2023 (amounts in thousands):
March 31, 2024: | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Available-for-sale securities: |  |  |  |  |  |  |
U.S. Treasury, short-term | $ | 19,203 |  |  | $ | — |  |  | $ | (51) |  |  | $ | 19,152 |
Commercial paper, short-term | 16,252 |  |  | 1 |  |  | (10) |  |  | 16,243 |
Corporate debt securities, short-term | 7,626 |  |  | 1 |  |  | (35) |  |  | 7,592 |
U.S. Treasury, long-term | 4,397 |  |  | — |  |  | (18) |  |  | 4,379 |
Corporate debt securities, long-term | 1,961 |  |  | — |  |  | (3) |  |  | 1,958 |
Total | $ | 49,439 |  |  | $ | 2 |  |  | $ | (117) |  |  | $ | 49,324 |
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 |
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 March 31, 2024 and September 30, 2023, respectively (amounts in thousands):
March 31, 2024: | 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 | $ | 19,152 |  |  | $ | 19,152 |  |  | $ | — |  |  | $ | — |
Commercial paper | 16,243 |  |  | — |  |  | 16,243 |  |  | — |
Corporate debt securities | 7,592 |  |  | — |  |  | 7,592 |  |  | — |
Total short-term investments at fair value | 42,987 |  |  | 19,152 |  |  | 23,835 |  |  | — |
Long-term investments: |  |  |  |  |  |  |
U.S. Treasury | 4,379 |  |  | 4,379 |  |  | — |  |  | — |
Corporate debt securities | 1,958 |  |  | — |  |  | 1,958 |  |  | — |
Total long-term investments at fair value | 6,337 |  |  | 4,379 |  |  | 1,958 |  |  | — |
Total assets at fair value | $ | 49,324 |  |  | $ | 23,531 |  |  | $ | 25,793 |  |  | $ | — |
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: |  |  |  |  |  |  |
Acquisition-related contingent consideration | $ | 7,976 |  |  | $ | — |  |  | $ | 7,976 |  |  |
Total liabilities at fair value | $ | 7,976 |  |  | $ | — |  |  | $ | 7,976 |  |  | $ | — |
Schedule of Acquisition-related Contingent Consideration Measured at Fair Value | The following table includes a roll-forward of the contingent consideration liability during the six months ended March 31, 2024 (amounts in thousands):
Balance at September 30, 2023 | $ | 7,976 |
Expenses recorded due to changes in fair value | 136 |
Cash payment of contingent consideration associated with the ID R&D acquisition | (4,641) |
Issuance of common stock as contingent consideration associated with the ID R&D acquisition | (3,471) |
Balance at March 31, 2024 | $ | — |

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