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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Income Taxes [Line Items]      
Total incomes taxes paid $ 200,000 $ 1,981,000  
Unrecognized tax benefits 150,000 300,000  
Additional accruals of UTB's 0 0  
Additional accruals of interest expense nor penalties 0 0  
R&D tax credits carryforwards 1,114,000 671,000  
Net deferred and other income tax liabilities   (693,000)  
Net deferred and other income tax assets 1,114,000    
Florida [Member]      
Income Taxes [Line Items]      
R&D tax credits carryforwards   179,000  
Reduction for income taxes payable   $ 65,000  
Tax Credit Carryforward, Expiration Date   Sep. 30, 2019  
R&D Credits 0 $ 244,000  
Florida [Member] | 2014 State Income Tax Return [Member]      
Income Taxes [Line Items]      
R&D tax credits carryforwards   214,000  
Amount increase adjustment in R&D tax credits carryforwards   35,000  
Federal [Member]      
Income Taxes [Line Items]      
R&D tax credits carryforwards 900,000 492,000 $ 805,000
Reduction for income taxes payable   313,000  
Amount increase adjustment in R&D tax credits carryforwards $ 133,000 275,000  
Federal [Member] | 2014 Federal Income Tax Return [Member]      
Income Taxes [Line Items]      
R&D tax credits carryforwards   $ 767,000  
Federal [Member] | Earliest Tax Year [Member]      
Income Taxes [Line Items]      
Tax Credit Carryforward, Expiration Date Sep. 30, 2031    
Federal [Member] | Latest Tax Year [Member]      
Income Taxes [Line Items]      
Tax Credit Carryforward, Expiration Date Sep. 30, 2034