Fair Value of Company's Contingent Consideration by Valuation Hierarchy (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration - current portion	$ (7,955)
Non-current contingent consideration	(2,310)	$ (10,962)
Total	(10,265)
Significant Unobservable (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration - current portion	(7,955)
Non-current contingent consideration	(2,310)	$ (10,962)
Total	$ (10,265)