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Intangible Assets - Additional Information (Detail) (USD $)
12 Months Ended
Sep. 30, 2012
Amortization period of intangible assets 12 years
Amortization of license agreements in 2013 $ 300,000
Amortization of license agreements in 2014 300,000
Amortization of license agreements in 2015 300,000
Amortization of license agreements in 2016 250,000
Amortization of license agreements in 2017 240,000
Amortization of license agreements, thereafter $ 280,000
Licensing Agreements [Member]
 
Amortization period of intangible assets 4 years
Minimum [Member] | Patents [Member]
 
Amortization period of intangible assets 3 years
Maximum [Member] | Patents [Member]
 
Amortization period of intangible assets 20 years