Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Current tax expense U.S.	$ 136	$ 137
Current tax expense (benefit) foreign	133	(30)
Deferred income tax expense	0	0
Income tax expense	$ 269	$ 107