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Inventories - Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Inventory Disclosure [Abstract]    
Finished goods $ 20,106 $ 20,798
Work in process 4,203 984
Raw materials 46,692 47,041
Obsolescence reserve (35,062) (34,960)
Total 35,939 33,863
Less current portion (14,057) (16,933)
Non-current portion $ 21,882 $ 16,930