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
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