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INVESTMENTS (Tables)
 6 Months Ended
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-term16,252 1 (10)16,243 
Corporate debt securities, short-term7,626 1 (35)7,592 
U.S. Treasury, long-term4,397 — (18)4,379 
Corporate debt securities, long-term1,961 — (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-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 March 31, 2024 and September 30, 2023, respectively (amounts in thousands):
March 31, 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$19,152 $19,152 $— $— 
Commercial paper16,243 — 16,243 — 
Corporate debt securities7,592 — 7,592 — 
Total short-term investments at fair value42,987 19,152 23,835 — 
Long-term investments:
U.S. Treasury4,379 4,379 — — 
Corporate debt securities1,958 — 1,958 — 
Total long-term investments at fair value6,337 4,379 1,958 — 
Total assets at fair value$49,324 $23,531 $25,793 $— 

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 six months ended March 31, 2024 (amounts in thousands):
Balance at September 30, 2023$7,976 
Expenses recorded due to changes in fair value136 
Cash payment of contingent consideration associated with the ID R&D acquisition(4,641)
Issuance of common stock as contingent consideration associated with the ID R&D acquisition(3,471)
Balance at March 31, 2024$—