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Investments (Tables)
 6 Months Ended
Mar. 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 March 31, 2020 and September 30, 2019, respectively (amounts shown in thousands):
March 31, 2020:Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Market
Value
Available-for-sale securities:    
U.S. Treasury, short-term$6,235  $76  $—  $6,311  
Asset-backed securities, short-term1,657  2  —  1,659  
Corporate debt securities, short-term11,063  1  (16) 11,048  
U.S. Treasury, long-term1,006  17  —  1,023  
Asset-backed securities, long-term3,086  —  (6) 3,080  
Corporate debt securities, long-term2,453  4  (14) 2,443  
Total$25,500  $100  $(36) $25,564  

September 30, 2019:
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Market
Value
Available-for-sale securities:
U.S. Treasury, short-term$4,240  $2  $—  $4,242  
Corporate debt securities, short-term12,258  2  —  12,260  
U.S. Treasury, long-term1,102  —  (1) 1,101  
Corporate debt securities, long-term451  —  —  451  
Total$18,051  $4  $(1) $18,054  
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, 2020 and September 30, 2019, respectively (amounts shown in thousands):
March 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$6,311  $6,311  $—  $—  
Asset-backed securities1,659  —  1,659  —  
Corporate debt securities    
Financial4,799  —  4,799  —  
Industrial1,371  —  1,371  —  
Commercial paper
Financial1,399  —  1,399  —  
Industrial3,479  —  3,479  —  
Total short-term investments at fair value19,018  6,311  12,707  —  
Long-term investments:
U.S. Treasury1,023  1,023  —  —  
Asset-backed securities3,080  —  3,080  —  
Corporate debt securities
Financial1,487  —  1,487  —  
Industrial956  —  956  —  
Total assets at fair value$25,564  $7,334  $18,230  $—  
Liabilities:
Acquisition-related contingent consideration575  —  —  575  
Total liabilities at fair value$575  $—  $—  $575  
September 30, 2019: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$4,242  $4,242  $—  $—  
Corporate debt securities    
Financial2,503  —  2,503  —  
Industrial1,371  —  1,371  —  
Commercial paper
Financial5,560  —  5,560  —  
Industrial2,826  —  2,826  —  
Total short-term investments at fair value16,502  4,242  12,260  —  
Long-term investments:
U.S. Treasury1,101  1,101  —  —  
Corporate debt securities
Financial451  —  451  —  
Total assets at fair value$18,054  $5,343  $12,711  $—  
Liabilities:
Acquisition-related contingent consideration1,601  —  —  1,601  
Total liabilities at fair value$1,601  $—  $—  $1,601  
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 six months ended March 31, 2020 (amounts shown in thousands):
Balance at September 30, 2019$1,601  
Payment of contingent consideration(1,049) 
Foreign currency effect on contingent consideration23  
Balance at March 31, 2020$575