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Fair Value of Company's Short-Term Investment and Contingent Consideration by Valuation Hierarchy (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Sep. 30, 2020
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Current portion contingent consideration liabilities | $ (2,317) |
Non-current portion contingent consideration liabilities | (6,932) | $ (10,962)
Fair Value, Measurements, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total assets | 9,900 |
Current portion contingent consideration liabilities | (2,317) |
Non-current portion contingent consideration liabilities | (6,932) | (10,962)
Total contingent consideration liabilities | (9,249) |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total assets | 9,900 |
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 | (2,317) |
Non-current portion contingent consideration liabilities | (6,932) | $ (10,962)
Total contingent consideration liabilities | (9,249) |
Fair Value, Measurements, Recurring | Corporate bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total assets | 9,900 |
Fair Value, Measurements, Recurring | Corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total assets | $ 9,900 |

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