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Inventories - Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Inventory Disclosure [Abstract]    
Finished goods $ 24,286 $ 17,967
Work in process 6,745 3,681
Raw materials 44,446 55,781
Obsolescence reserve (32,347) (32,050)
Total 43,130 45,379
Less current portion (23,907) (23,855)
Non-current portion $ 19,223 $ 21,524