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Investments - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract] |  |  |
Other-than-temporary impairment charges recognized | $ 0 | $ 0 |
Realized gains (losses) from sale of available-for-sale securities | 0 | $ 0 |
Acquisition-related contingent consideration | $ 790,000 |  | $ 753,000

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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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