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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Mar. 31, 2021
Fair Value Disclosures [Abstract] |
Fair Value of Company's Short-Term Investment and Contingent Consideration by Valuation Hierarchy | The following tables present the fair value of the Company’s short-term investments and contingent consideration by valuation hierarchy and input (in thousands):
|  | As of March 31, 2021 |
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable (Level 2) |  |  | Significant Unobservable (Level 3) |  |  | Totals |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 3,865 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,865 |
Total assets |  | $ | 3,865 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,865 |
Contingent consideration: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion |  |  | — |  |  |  | — |  |  |  | (2,324 | ) |  |  | (2,324 | )
Non-current portion |  |  | — |  |  |  | — |  |  |  | (7,720 | ) |  |  | (7,720 | )
Total liabilities |  | $ | — |  |  | $ | — |  |  | $ | (10,044 | ) |  | $ | (10,044 | )
|  | As of September 30, 2020 |
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable (Level 2) |  |  | Significant Unobservable (Level 3) |  |  | Totals |
Non-current contingent consideration |  | $ | — |  |  | $ | — |  |  | $ | (10,962 | ) |  | $ | (10,962 | )
Changes in Fair Value of Company Level 3 Financial Instruments | The following table summarizes changes in the fair value of the Company’s Level 3 financial instruments for the six months ended March 31, 2021:
Balance at October 1, 2020 | $ | 10,962 |
Fair value adjustments |  | (697 | )
Balance at December 31, 2020 |  | 10,265 |
Fair value adjustments |  | (221 | )
Balance at March 31, 2021 | $ | 10,044 |

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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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