Property, Plant, and Equipment, net (Schedule of Property, Plant, and Equipment) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 46,359	$ 42,459
Accumulated depreciation	(28,143)	(25,824)
Property, plant, and equipment, net	18,216	16,635
Equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	36,625	31,507
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	1,109	1,109
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	2,928	2,974
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	2,049	2,330
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 3,648	$ 4,539