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Inventory (Schedule of Components of Inventory) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 13,352 $ 15,826
Work in-process 5,121 6,586
Finished goods 8,032 5,413
Inventory balance at end of period 26,505 27,825
Current portion 23,726 25,139
Non-Current portion $ 2,779 $ 2,686