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Fair Value of Company's Short-term Investments, Contingemt Earn-Out Liability and Foreign Currency Forward Contracts (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Mar. 31, 2020 | Sep. 30, 2019
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Contingent Consideration | $ (10,912) | $ (9,940)
Total | (10,934) | (9,944)
Significant Other Observable (Level 2) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total | (22) | (4)
Significant Unobservable (Level 3) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Contingent Consideration | (10,912) | (9,940)
Total | (10,912) | (9,940)
Foreign Currency Forward Contracts |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Foreign Currency Forward Contract | (22) | (4)
Foreign Currency Forward Contracts | Significant Other Observable (Level 2) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Foreign Currency Forward Contract | $ (22) | $ (4)

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