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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Income Taxes [Line Items]    
Total incomes taxes paid $ 1,105,000 $ 200,000
Unrecognized tax benefits 150,000 150,000
Additional accruals of UTB's 0 0
Additional accruals of interest expense nor penalties $ 0 $ 0
Effective income tax rate 25.20% (48.70%)
R&D tax credits carryforwards $ 871,000 $ 1,114,000
Net deferred and other income tax liabilities $ (316,000)  
Earliest Tax Year [Member]    
Income Taxes [Line Items]    
Tax Credit Carryforward, Expiration Date Sep. 30, 2031  
Latest Tax Year [Member]    
Income Taxes [Line Items]    
Tax Credit Carryforward, Expiration Date Sep. 30, 2035  
Florida R&D Credits [Member]    
Income Taxes [Line Items]    
R&D tax credits carryforwards $ 224,000 214,000
Tax Credit Carryforward, Expiration Date Sep. 30, 2020  
R&D Credits $ 10,000  
Federal [Member]    
Income Taxes [Line Items]    
R&D tax credits carryforwards 647,000 $ 900,000
Net usage of R&D tax credits carryforwards $ 253,000