Property, Plant, and Equipment, net - Schedule of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 58,595	$ 53,286
Accumulated depreciation	(36,051)	(32,234)
Property, plant, and equipment, net	22,544	21,052
Equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	37,985	35,218
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	1,125	1,125
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	3,575	3,473
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	6,663	3,169
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 9,247	$ 10,301

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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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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