Property, Plant, and Equipment, net (Schedule of Property, Plant, and Equipment) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Sep. 30, 2019
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 52,281	$ 52,281	$ 71,866
Accumulated depreciation	(31,071)	(31,071)	(34,643)
Property, plant, and equipment, net	21,210	21,210	37,223
Gain on sale of equipment	300	1,900
Land
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross			3,484
Building
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross			9,405
Equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	34,577	34,577	42,308
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	1,125	1,125	1,109
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	3,460	3,460	3,554
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	3,061	3,061	2,676
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 10,058	$ 10,058	$ 9,330