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INVESTMENTS (Tables)
 9 Months Ended
Jun. 30, 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 June 30, 2024 and September 30, 2023 (amounts in thousands):
June 30, 2024:Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Market
Value
Available-for-sale securities:    
U.S. Treasury, short-term$3,814 $— $(24)$3,790 
U.S. Government and agency securities, short-term6,722 — (4)6,718 
Commercial paper, short-term15,723 — (12)15,711 
Corporate debt securities, short-term12,538 — (39)12,499 
U.S. Treasury, long-term— — — — 
Foreign government and agency securities, long-term— — — — 
Corporate debt securities, long-term10,183 — (26)10,157 
Total$48,980 $— $(105)$48,875 
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-term34,545 — (99)34,446 
U.S. Treasury, long-term1,371 — (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 June 30, 2024 and September 30, 2023, respectively (amounts in thousands):
June 30, 2024:BalanceQuoted Prices in Active Markets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Assets:
    
Short-term investments:    
U.S. Treasury$3,790 $3,790 $— $— 
Commercial paper15,711 — 15,711 — 
U.S. Government and agency securities, short-term6,718 — 6,718 — 
Corporate debt securities12,499 — 12,499 — 
Total short-term investments at fair value38,718 3,790 34,928 — 
Long-term investments:
Corporate debt securities10,157 — 10,157 — 
Total long-term investments at fair value10,157 — 10,157 — 
Total assets at fair value$48,875 $3,790 $45,085 $— 

September 30, 2023:BalanceQuoted 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 securities34,446 — 34,446 — 
Total short-term investments at fair value74,700 40,254 34,446 — 
Long-term investments:
U.S. Treasury1,304 1,304 — — 
Total long-term investments at fair value1,304 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 nine months ended June 30, 2024 (amounts in thousands):
Balance at September 30, 2023$7,976 
Expenses recorded due to changes in fair value136 
Cash payment of contingent consideration associated with the ID R&D acquisition(4,641)
Issuance of common stock as contingent consideration associated with the ID R&D acquisition(3,471)
Balance at June 30, 2024$—