Accrued Expenses - Accrued Expenses (Detail) - USD ($)	Sep. 30, 2016	Sep. 30, 2015
Payables and Accruals [Abstract]
Payroll and related accruals	$ 1,330,000	$ 894,000
Warranty and related accruals	401,000	204,000
Professional fees	133,000	97,000
Other	400,000	257,000
Accrued expenses	$ 2,264,000	$ 1,452,000