Property, Plant, and Equipment, net (Schedule of Property, Plant, and Equipment) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 33,914	$ 30,554
Accumulated depreciation	(22,913)	(21,629)
Property, plant, and equipment, net	11,001	8,925
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	26,895	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	2,611	2,177
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	1,853	1,480
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 1,446	$ 875