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Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Sep. 30, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 4,368 $ 4,453
Work in process 5,972 5,168
Finished goods 2,218 1,746
Parts and supplies 11,171 9,599
Total inventories $ 23,729 $ 20,966