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Inventories - Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Sep. 30, 2021
Inventory Disclosure [Abstract]    
Finished goods $ 21,271 $ 19,368
Work in process 5,241 8,247
Raw materials 43,324 43,620
Obsolescence reserve (36,593) (36,936)
Total 33,243 34,299
Less current portion (19,919) (16,196)
Non-current portion $ 13,324 $ 18,103