Accrued Expenses - Accrued Expenses (Detail) - USD ($)	Sep. 30, 2017	Sep. 30, 2016
Payables and Accruals [Abstract]
Payroll and related accruals	$ 1,374,000	$ 1,330,000
Warranty and related accruals	412,000	401,000
Professional fees	158,000	133,000
Other	482,000	400,000
Accrued expenses	$ 2,426,000	$ 2,264,000