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Inventories - Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
Inventory Disclosure [Abstract]    
Finished goods $ 14,653 $ 14,968
Work in process 6,230 8,247
Raw materials 25,609 24,720
Obsolescence reserve (net realizable value adjustment) (13,971) (13,636)
Total 32,521 34,299
Less current portion (19,995) (16,196)
Non-current portion $ 12,526 $ 18,103