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Investments (Tables) | 3 Months Ended
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Dec. 31, 2019
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, 2019 and September 30, 2019, respectively (amounts shown in thousands):
December 31, 2019: | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Available-for-sale securities: |  |  |  |  |  |  |
U.S. Treasury, short-term | $ | 5,217 |  |  | $ | 3 |  |  | $ | (1) |  |  | $ | 5,219 |
Asset-backed securities, short-term | 801 |  |  | — |  |  | — |  |  | 801 |
Corporate debt securities, short-term | 12,248 |  |  | 3 |  |  | — |  |  | 12,251 |
U.S. Treasury, long-term | 4,033 |  |  | 1 |  |  | — |  |  | 4,034 |
Asset-backed securities, long-term | 2,116 |  |  | 1 |  |  | — |  |  | 2,117 |
Corporate debt securities, long-term | 654 |  |  | — |  |  | — |  |  | 654 |
Total | $ | 25,069 |  |  | $ | 8 |  |  | $ | (1) |  |  | $ | 25,076 |
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 December 31, 2019 and September 30, 2019, respectively (amounts shown in thousands):
December 31, 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 | $ | 5,219 |  |  | $ | 5,219 |  |  | $ | — |  |  | $ | — |
Asset-backed securities | 801 |  |  | — |  |  | 801 |  |  | — |
Corporate debt securities |  |  |  |  |  |  |
Financial | 2,954 |  |  | — |  |  | 2,954 |  |  | — |
Industrial | 1,372 |  |  | — |  |  | 1,372 |  |  | — |
Commercial paper |  |  |  |  |  |  |
Financial | 5,334 |  |  | — |  |  | 5,334 |  |  | — |
Industrial | 2,591 |  |  | — |  |  | 2,591 |  |  | — |
Total short-term investments at fair value | 18,271 |  |  | 5,219 |  |  | 13,052 |  |  | — |
Long-term investments: |  |  |  |  |  |  |
U.S. Treasury | 4,034 |  |  | 4,034 |  |  | — |  |  | — |
Asset-backed securities | 2,117 |  |  | — |  |  | 2,117 |  |  | — |
Corporate debt securities |  |  |  |  |  |  |
Financial | 654 |  |  | — |  |  | 654 |  |  | — |
Total assets at fair value | $ | 25,076 |  |  | $ | 9,253 |  |  | $ | 15,823 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Acquisition-related contingent consideration | 1,642 |  |  | — |  |  | — |  |  | 1,642 |
Total liabilities at fair value | $ | 1,642 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,642 |
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 |  |  | — |
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 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, 2019 (amounts shown in thousands):
Balance at September 30, 2019 | $ | 1,601 |
Foreign currency effect on contingent consideration | 41 |
Balance at December 31, 2019 | $ | 1,642 |

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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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