Property, Plant, and Equipment, net (Schedule of Property, Plant, and Equipment) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 35,891	$ 30,554
Accumulated depreciation	(23,678)	(21,629)
Property, plant, and equipment, net	12,213	8,925
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	28,247	24,913
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	2,860	2,177
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	1,896	1,480
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 1,779	$ 875