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Investments (Tables)
3 Months Ended
Dec. 31, 2018
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, 2018 and September 30, 2018, respectively (amounts shown in thousands):
December 31, 2018:Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Market
Value
Available-for-sale securities:    
U.S. Treasury, short-term$3,698 $— $(2)$3,696 
Corporate debt securities, short-term5,561 — (9)5,552 
Total$9,259 $— $(11)$9,248 

September 30, 2018:
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Market
Value
Available-for-sale securities:    
U.S. Treasury, short-term$3,693 $— $(10)$3,683 
Corporate debt securities, short-term4,779 — (14)4,765 
Total$8,472 $— $(24)$8,448 
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, 2018 and September 30, 2018, respectively (amounts shown in thousands):
December 31, 2018: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$3,696 $3,696 $— $— 
Corporate debt securities    
Financial2,246 — 2,246 — 
Industrial1,922 — 1,922 — 
Commercial paper
Financial1,384 — 1,384 — 
Total assets at fair value$9,248 $3,696 $5,552 $— 
Liabilities:
    
Acquisition-related contingent consideration3,007 — — 3,007 
Total liabilities at fair value$3,007 $— $— $3,007 
September 30, 2018: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$3,683 $3,683 $— $— 
Corporate debt securities    
Financial2,847 — 2,847 — 
Industrial1,918 — 1,918 — 
Total assets at fair value$8,448 $3,683 $4,765 $— 
Liabilities:
    
Acquisition-related contingent consideration3,051 — — 3,051 
Total liabilities at fair value3,051 — — 3,051 
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, 2018 (amounts shown in thousands):
Balance at September 30, 2018$3,051 
Foreign currency effect on contingent consideration(44)
Balance at December 31, 2018$3,007