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Short-term Investments - Summary of Short-Term Investments (Details) - Corporate Bonds - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021
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Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | $ 7,649 | $ 9,511
Unrealized Losses | (24) | (15)
Estimated Fair Value | $ 7,625 | $ 9,496

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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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