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Goodwill and Intangible Assets - Schedule of Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Goodwill And Intangible Assets Disclosure [Abstract]    
2017 (remaining nine months) $ 422  
2018 563  
2019 563  
2020 550  
2021 369  
Net $ 2,467 $ 2,783