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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]          
Goodwill $ 2,725   $ 2,725   $ 2,863
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]          
Amortization of intangible assets $ 144 $ 149 $ 287 $ 298  
Minimum          
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]          
Estimated useful lives of intangible assets (in years)     5 years    
Maximum          
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]          
Estimated useful lives of intangible assets (in years)     6 years