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Investments (Tables)
 3 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments by Type of Security
The following tables summarize investments by type of security as of December 31, 2020 and September 30, 2020, respectively (amounts shown in thousands):
December 31, 2020:Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Market
Value
Available-for-sale securities:    
U.S. Treasury, short-term$9,557 $14 $— $9,571 
Asset-backed securities, short-term3,914 21 — 3,935 
Corporate debt securities, short-term26,713 20 (1)26,732 
U.S. Treasury, long-term2,745 — — 2,745 
Asset-backed securities, long-term962 — — 962 
Corporate debt securities, long-term1,890 — — 1,890 
Total$45,781 $55 $(1)$45,835 

September 30, 2020:
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Market
Value
Available-for-sale securities:
U.S. Treasury, short-term$10,245 $38 $— $10,283 
Asset-backed securities, short-term4,723 36 — 4,759 
Corporate debt securities, short-term24,956 37 — 24,993 
Corporate debt securities, long-term1,966 — (3)1,963 
Total$41,890 $111 $(3)$41,998 
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 December 31, 2020 and September 30, 2020, respectively (amounts shown in thousands):
December 31, 2020: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$9,571 $9,571 $— $— 
Asset-backed securities3,935 — 3,935 — 
Corporate debt securities    
Financial6,387 6,387 — 
Industrial1,913 1,913 — 
Commercial paper
Financial12,488 12,488 — 
Industrial5,944 5,944 — 
Total short-term investments at fair value40,238 9,571 30,667 — 
Long-term investments:
U.S. Treasury2,745 2,745 — — 
Asset-backed securities962 — 962 — 
Corporate debt securities
Financial— — 
Industrial1,890 1,890 
Total assets at fair value$45,835 $12,316 $33,519 $— 
Liabilities:
Acquisition-related contingent consideration790 — — 790 
Total liabilities at fair value$790 $— $— $790 
September 30, 2020: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$10,283 $10,283 $— $— 
Asset-backed securities, short-term$4,759 — 4,759 — 
Corporate debt securities    
Financial7,695 — 7,695 — 
Industrial1,924 — 1,924 — 
Commercial paper
Financial13,479 — 13,479 — 
Industrial1,895 — 1,895 — 
Total short-term investments at fair value40,035 10,283 29,752 — 
Long-term investments:
U.S. Treasury— — — — 
Corporate debt securities
Financial977 — 977 — 
Industrial986 — 986 — 
Total assets at fair value$41,998 $10,283 $31,715 $— 
Liabilities:
Acquisition-related contingent consideration753 — — 753 
Total liabilities at fair value$753 $— $— $753 
Schedule of Contingent Consideration Measured at Fair Value The following table includes a summary of the contingent consideration measured at fair value using significant unobservable inputs (Level 3) during the three months ended December 31, 2020 (amounts shown in thousands):
Balance at September 30, 2020$753 
Foreign currency effect on contingent consideration37 
Balance at December 31, 2020$790