Balance Sheet Components - Property Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 197,277	$ 178,163
Less: Accumulated depreciation and amortization	(94,994)	(75,643)
Property and equipment, net	102,283	102,520
Laboratory equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	101,583	99,528
Furniture, fixtures and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,905	2,944
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	211	211
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,176	3,249
Computer software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,009	10,095
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	58,277	57,448
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 20,116	$ 4,688