Accrued Expenses - Accrued Expenses (Detail) - USD ($)	Sep. 30, 2019	Sep. 30, 2018
Payables and Accruals [Abstract]
Payroll and related accruals	$ 1,759,000	$ 1,371,000
Warranty and related accruals	277,000	400,000
Professional fees	205,000	118,000
Income tax accruals	175,000
Other	244,000	196,000
Accrued expenses	$ 2,660,000	$ 2,085,000	[1]

[1] The amounts as of September 30, 2018 have been adjusted to reflect the change in inventory accounting method, as described in Notes 1 and 2 to the Consolidated Financial Statements.