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Inventories - Net Inventories (Detail) - USD ($)
Dec. 31, 2019
Sep. 30, 2019
Inventory, Net [Abstract]    
Raw materials $ 14,389,000 $ 14,158,000
Work in process 1,877,000 1,397,000
Finished goods 9,425,000 9,811,000
Inventories, net $ 25,691,000 $ 25,366,000