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Commitments and Contingencies - Additional Information (Detail) - USD ($)
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]    
Future minimum rental commitments $ 186,000  
Future minimum rental commitments due over period 3 years  
Total rental expense $ 200,000 $ 182,000
Future minimum rental commitments due current $ 66,000