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Inventories - Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Inventory Disclosure [Abstract]    
Finished goods $ 20,798 $ 17,967
Work in process 984 3,681
Raw materials 47,041 55,781
Obsolescence reserve (34,960) (32,050)
Total 33,863 45,379
Less current portion 16,933 23,855
Non-current portion $ 16,930 $ 21,524