Income Taxes - Reconciliation of Income Tax Expense (Benefit) Computed at Country Specific Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income tax expense (benefit) at statutory rate	$ (1,036)	$ (1,502)
State income tax expense (benefit)	(130)	(131)
Foreign tax activity	9	56
R&D tax credit expiration	0	0
Permanent differences, net	274	523
Adjustment of temporary differences to income tax returns	0	189
Change in valuation allowance	1,152	972
Income tax expense	$ 269	$ 107