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Investments (Tables)
 9 Months Ended
Jun. 30, 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 June 30, 2020 and September 30, 2019, respectively (amounts shown in thousands):
June 30, 2020:Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Market
Value
Available-for-sale securities:    
U.S. Treasury, short-term$8,245  $62  $—  $8,307  
Asset-backed securities, short-term3,769  34  —  3,803  
Corporate debt securities, short-term18,147  24  —  18,171  
Asset-backed securities, long-term964  14  —  978  
Corporate debt securities, long-term1,936  28  —  1,964  
Total$33,061  $162  $—  $33,223  

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 June 30, 2020 and September 30, 2019, respectively (amounts shown in thousands):
June 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$8,307  $8,307  $—  $—  
Asset-backed securities3,803  —  3,803  —  
Corporate debt securities    
Financial6,385  —  6,385  —  
Industrial1,918  —  1,918  —  
Commercial paper
Financial6,978  —  6,978  —  
Industrial2,890  —  2,890  —  
Total short-term investments at fair value30,281  8,307  21,974  —  
Long-term investments:
U.S. Treasury—  —  —  —  
Asset-backed securities978  —  978  —  
Corporate debt securities
Financial997  —  997  —  
Industrial967  —  967  —  
Total assets at fair value$33,223  $8,307  $24,916  $—  
Liabilities:
Acquisition-related contingent consideration686  —  —  686  
Total liabilities at fair value$686  $—  $—  $686  
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 nine months ended June 30, 2020 (amounts shown in thousands):
Balance at September 30, 2019$1,601  
Expenses recorded due to changes in fair value98  
Payment of contingent consideration(1,049) 
Foreign currency effect on contingent consideration36  
Balance at June 30, 2020$686