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Property, Equipment and Improvements, Net (Detail) - Property, equipment and improvements, net - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 9,353 $ 8,966
Less accumulated depreciation and amortization (7,845) (7,286)
Property, equipment and improvements, net 1,508 1,680
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 224 263
Equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 9,055 8,629
Automobiles    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 74 $ 74