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Inventory (Schedule of Components of Inventory) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2019
Sep. 30, 2018
Inventory Disclosure [Abstract]      
Raw materials $ 12,462 $ 12,462 $ 11,857
Work in-process 5,523 5,523 5,402
Finished goods 3,801 3,801 5,024
Inventory balance at end of period 21,786 21,786 22,283
Current portion 20,672 20,672 20,850
Non-Current portion 1,114 1,114 $ 1,433
Inventory valuation reserve $ 100 $ 500