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Goodwill and Intangible Assets - Schedule of Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2017 (remaining six months) $ 286  
2018 572  
2019 572  
2020 559  
2021 374  
Net $ 2,363 $ 2,783