Fair Value of Financial Instruments - Fair Value of Company's Short-Term Investment and Contingent Consideration by Valuation Hierarchy (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Sep. 30, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Current portion contingent consideration liabilities	$ 168	$ 807
Non-current portion contingent consideration liabilities		5,210
Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total assets	1,598	9,496
Current portion contingent consideration liabilities	168	807
Non-current portion contingent consideration liabilities		5,210
Total liabilities	168	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	1,598	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	168	807
Non-current portion contingent consideration liabilities		5,210
Total liabilities	168	6,017
Fair Value, Measurements, Recurring | Corporate bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total assets	1,598	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	$ 1,598	$ 9,496