Property, Plant, and Equipment, net (Schedule of Property, Plant, and Equipment) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 42,459	$ 35,891
Accumulated depreciation	(25,824)	(23,678)
Property, plant, and equipment, net	16,635	12,213
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	31,507	28,247
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	1,109	1,109
Computer hardware and software [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	2,974	2,860
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	2,330	1,896
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 4,539	$ 1,779