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Investments
 3 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
INVESTMENTS
3. INVESTMENTS
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 

The cost of securities sold is based on the specific identification method. Amortization of premiums, accretion of discounts, interest, dividend income and realized gains and losses are included in other income, net in the consolidated statements of operations and other comprehensive income.
The Company determines the appropriate designation of investments at the time of purchase and reevaluates such designation as of each balance sheet date. All of the Company’s investments are designated as available-for-sale debt securities. As of December 31, 2020 and September 30, 2020, the Company’s short-term investments have maturity dates of less than one year from the balance sheet date and the Company’s long-term investments have maturity dates of greater than one year from the balance sheet date.
Available-for-sale marketable securities are carried at fair value as determined by quoted market prices for identical or similar assets, with unrealized gains and losses, net of taxes, and reported as a separate component of stockholders’ equity. Management reviews the fair value of the portfolio at least monthly and evaluates individual securities with fair value below amortized cost at the balance sheet date. For debt securities, in order to determine whether impairment is other-than-temporary, management must conclude whether the Company intends to sell the impaired security and whether it is more likely than not that the Company will be required to sell the security before recovering its amortized cost basis. If management intends to sell an impaired debt security or it is more likely than not that the Company will be required to sell the security prior to recovering its amortized cost basis, an other-than-temporary impairment is deemed to have occurred. The amount of an other-than-temporary impairment on debt securities related to a credit loss, or securities that management intends to sell before recovery, is recognized in earnings. The amount of an other-than-temporary impairment on debt securities related to other factors is recorded consistent with changes in the fair value of all other available-for-sale securities as a component of stockholders’ equity in other comprehensive income. No other-than-temporary impairment charges were recognized in the three months ended December 31, 2020 and 2019. There were no realized gains or losses from the sale of available-for-sale securities during the three months ended December 31, 2020 and 2019.
Fair Value Measurements and Disclosures
FASB ASC Topic 820, Fair Value Measurements (“ASC 820”) defines fair value, establishes a framework for measuring fair value under GAAP and enhances disclosures about fair value measurements. Fair value is defined under ASC 820 as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value under ASC 820 must maximize the use of observable inputs and minimize the use of unobservable inputs. ASC 820 describes a fair value hierarchy based on the following three levels of inputs that may be used to measure fair value, of which the first two are considered observable and the last, unobservable:
•Level 1—Quoted prices in active markets for identical assets or liabilities;
•Level 2—Inputs other than Level 1 inputs that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and
•Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
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 
As of December 31, 2020, total acquisition-related contingent consideration of $0.8 million is recorded as acquisition-related contingent consideration in the consolidated balance sheets. 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