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SUPPLEMENTAL BALANCE SHEET INFORMATION - Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Sep. 30, 2023
Inventories    
Raw materials $ 2,184 $ 2,259
Work in progress 73 124
Finished goods 4,069 4,439
Research Model Inventory 47,634 52,524
Total 53,960 59,346
Less: Obsolescence reserve (3,320) (3,244)
Inventories, net $ 50,640 $ 56,102