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Inventory (Schedule of Components of Inventory) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 15,826 $ 16,095
Work in-process 6,586 5,687
Finished goods 5,414 5,899
Inventory balance at end of period 27,826 27,681
Current portion 25,139 24,150
Non-Current portion $ 2,686 $ 3,531