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Acquired Intangible Assets (Detail) - Annual amortization expense related to intangible assets - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2017 $ 119  
2018 11  
2019 9  
2020 9  
2021 9  
Thereafter 10  
Total $ 167 $ 287