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Inventory (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 4,175 $ 4,104
Work in process 4,396 3,731
Finished goods 1,608 1,692
Parts and supplies 8,538 7,396
Total inventories $ 18,717 $ 16,923