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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
Sep. 30, 2012
Income Tax [Line Items]                    
Total incomes taxes paid                 $ 202,000 $ 145,000
Unrecognized tax benefits 300,000       300,000       300,000 300,000
Additional accruals of UTB's                 0 0
Additional accruals of interest expense nor penalties                 0 0
Tax refunds related to R&D Credits for tax years 2006 through 2008                 827,000  
Additional R&D Credits related to tax years 2009 through 2012                 1,302,000  
R&D Credits                 2,129,000  
Income tax benefit (1,163,000) 873,000 733,000 (835,000) 137,000 513,000 1,405,000 325,000 (392,000) 2,380,000
Reduction in the company's current federal income taxes payable                 497,000  
R&D Credits carry-forwards in the net deferred income 805,000               805,000  
Net deferred income and other tax liabilities $ (484,000)       $ (974,000)       $ (484,000) $ (974,000)
R&D Credits carry-forwards in the net deferred income expires minimum period                 2031  
R&D Credits carry-forwards in the net deferred income expires maximum period                 2033  
Minimum [Member]
                    
Income Tax [Line Items]                    
Percentage of tax realized upon settlement                 50.00%