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 of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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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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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services 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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Property, Plant, and Equipment, net (Schedule of Property, Plant, and Equipment) (Details) - USD ($)	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2020
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 53,857,000		$ 53,286,000
Accumulated depreciation	(33,299,000)		(32,234,000)
Property, plant, and equipment, net	20,558,000		21,052,000
Gain on sale of equipment	29,000	$ 1,600,000
Equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	36,074,000		35,218,000
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	1,125,000		1,125,000
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	3,476,000		3,473,000
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	3,249,000		3,169,000
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 9,933,000		$ 10,301,000