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Balance sheet components - Schedule Of Property Plant And Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 79,544	$ 54,944
Less: Accumulated depreciation and amortization	(35,422)	(29,478)
Property, Plant and Equipment, Net, Total	44,122	25,466
Laboratory equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	48,439	37,338
Furniture, fixtures and other equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	2,195	1,728
Computer equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	2,977	2,834
Computer software
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,899	3,678
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	5,066	4,669
Construction in progress
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 16,968	$ 4,697

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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