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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Inventory Disclosure [Abstract]    
Finished goods $ 14,712 $ 18,802
Work in process 7,405 7,926
Raw material 57,099 54,290
Obsolescence reserve (30,648) (30,551)
Total 48,568 50,467
Less current portion 17,565 18,812
Non-current portion $ 31,003 $ 31,655