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Fair Value of Financial Instruments - Fair Value of Company's Short-Term Investment and Contingent Consideration by Valuation Hierarchy (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Current portion contingent consideration liabilities | $ (247) | $ (807)
Non-current portion contingent consideration liabilities | (2,523) | (5,210)
Fair Value, Measurements, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total assets | 7,625 | 9,496
Current portion contingent consideration liabilities | (247) |
Non-current portion contingent consideration liabilities | (2,523) | (6,017)
Total liabilities | (2,770) | (6,017)
Fair Value, Measurements, Recurring | Significant Other Observable (Level 2) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total assets | 7,625 | 9,496
Fair Value, Measurements, Recurring | Significant Unobservable (Level 3) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Current portion contingent consideration liabilities | (247) |
Non-current portion contingent consideration liabilities | (2,523) | (6,017)
Total liabilities | (2,770) | (6,017)
Fair Value, Measurements, Recurring | Corporate bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total assets | 7,625 | 9,496
Fair Value, Measurements, Recurring | Corporate bonds | Significant Other Observable (Level 2) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total assets | $ 7,625 | $ 9,496

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