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Investments (Tables) | 12 Months Ended
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Sep. 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 September 30, 2020 and 2019, respectively (amounts shown in thousands):
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-term | 4,723 |  |  | 36 |  |  | — |  |  | 4,759 |
Corporate debt securities, short-term | 24,956 |  |  | 37 |  |  | — |  |  | 24,993 |
Corporate debt securities, long-term | 1,966 |  |  | — |  |  | (3) |  |  | 1,963 |
Total | $ | 41,890 |  |  | $ | 111 |  |  | $ | (3) |  |  | $ | 41,998 |
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-term | 12,258 |  |  | 2 |  |  | — |  |  | 12,260 |
U.S. Treasury, long-term | 1,102 |  |  | — |  |  | (1) |  |  | 1,101 |
Corporate debt securities, long-term | 451 |  |  | — |  |  | — |  |  | 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 September 30, 2020 and 2019, respectively (amounts shown in thousands):
September 30, 2020: | Balance |  | Quoted 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 | 4,759 |  |  | — |  |  | 4,759 |  |  | — |
Corporate debt securities |  |  |  |  |  |  |
Financial | 7,695 |  |  | — |  |  | 7,695 |  |  | — |
Industrial | 1,924 |  |  | — |  |  | 1,924 |  |  | — |
Commercial paper |  |  |  |  |  |  |
Financial | 13,479 |  |  | — |  |  | 13,479 |  |  | — |
Industrial | 1,895 |  |  | — |  |  | 1,895 |  |  | — |
Total short-term investments at fair value | 40,035 |  |  | 10,283 |  |  | 29,752 |  |  | — |
Long-term investments: |  |  |  |  |  |  |
U.S. Treasury | — |  |  | — |  |  | — |  |  | — |
Asset-backed securities | — |  |  | — |  |  | — |  |  | — |
Corporate debt securities |  |  |  |  |  |  |
Financial | 977 |  |  | — |  |  | 977 |  |  | — |
Industrial | 986 |  |  | — |  |  | 986 |  |  | — |
Total assets at fair value | $ | 41,998 |  |  | $ | 10,283 |  |  | $ | 31,715 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Acquisition-related contingent consideration | 753 |  |  | — |  |  | — |  |  | 753 |
Total liabilities at fair value | $ | 753 |  |  | $ | — |  |  | $ | — |  |  | $ | 753 |
September 30, 2019: | Balance |  | Quoted 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 |  |  |  |  |  |  |
Financial | 2,503 |  |  | — |  |  | 2,503 |  |  | — |
Industrial | 1,371 |  |  | — |  |  | 1,371 |  |  | — |
Commercial paper |  |  |  |  |  |  |
Financial | 5,560 |  |  | — |  |  | 5,560 |  |  | — |
Industrial | 2,826 |  |  | — |  |  | 2,826 |  |  | — |
Total short-term investments at fair value | 16,502 |  |  | 4,242 |  |  | 12,260 |  |  | — |
Long-term investments: |  |  |  |  |  |  |
U.S. Treasury | 1,101 |  |  | 1,101 |  |  | — |  |  | — |
Corporate debt securities |  |  |  |  |  |  |
Financial | 451 |  |  | — |  |  | 451 |  |  | — |
Industrial | — |  |  | — |  |  | — |  |  | — |
Total assets at fair value | $ | 18,054 |  |  | $ | 5,343 |  |  | $ | 12,711 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Acquisition-related contingent consideration | 1,601 |  |  | — |  |  | — |  |  | 1,601 |
Total liabilities at fair value | $ | 1,601 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,601 |
Schedule of Acquisition-related 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 year ended September 30, 2020 (amounts shown in thousands):
Balance at September 30, 2019 | $ | 1,601 |
Expenses recorded due to changes in fair value | 136 |
Payment of contingent consideration | (1,049) |
Foreign currency effect on contingent consideration | 65 |
Balance at September 30, 2020 | $ | 753 |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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