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Income Taxes - Summary of Reconciliation of Activity Related to Liability for Gross Unrecognized Tax Benefits (Detail)
$ in Thousands
12 Months Ended
Sep. 30, 2016
USD ($)
Income Tax Disclosure [Abstract]  
Beginning year balance $ 493
Increase related to prior year tax positions 0
Increase related to current year tax positions 0
Settlements 0
Lapse of statutes of limitations 0
Ending year balance $ 493