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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 | Mar. 31, 2022 | 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 | $ 167 | $ 807
Non-current portion contingent consideration liabilities | 385 | 5,210
Fair Value, Measurements, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total assets | 3,660 | 9,496
Current portion contingent consideration liabilities | 167 |
Non-current portion contingent consideration liabilities | 385 | 6,017
Total liabilities | 552 | 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 | 3,660 | 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 | 167 |
Non-current portion contingent consideration liabilities | 385 | 6,017
Total liabilities | 552 | 6,017
Fair Value, Measurements, Recurring | Corporate bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total assets | 3,660 | 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 | $ 3,660 | $ 9,496

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