Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Schedule Of Income Taxes [Line Items]
Deferred tax asset	$ 36,509,000	$ 37,955,000
Research and development tax credit carryforwards	418,000
Net operating loss and other carryforwards	34,563,000	36,492,000
Deferred tax liability, unremitted earnings of foreign subsidiaries	0
Deferred tax liabilities, undistributed foreign earnings	0
Unremitted foreign earnings	$ 1,400,000
Goodwill for tax purposes amortization period	15 years
Deferred tax liability	$ 4,564,000	4,322,000
Accruals of interest and penalties	0
Recognized interest or penalties	0	0
Additional Paid-in Capital [Member]
Schedule Of Income Taxes [Line Items]
Net operating loss and other carryforwards	$ 1,100,000
Minimum [Member] | Research Tax Credit Carryforward [Member]
Schedule Of Income Taxes [Line Items]
Research and development tax credit carryforwards expire date	2019
Maximum [Member] | Research Tax Credit Carryforward [Member]
Schedule Of Income Taxes [Line Items]
Research and development tax credit carryforwards expire date	2020
Federal Tax [Member]
Schedule Of Income Taxes [Line Items]
Operating loss carryforwards	$ 95,000,000
Federal Tax [Member] | Minimum [Member]
Schedule Of Income Taxes [Line Items]
Operating loss carryforwards for federal tax purposes	2019
Federal Tax [Member] | Maximum [Member]
Schedule Of Income Taxes [Line Items]
Operating loss carryforwards for federal tax purposes	2036
State tax [Member]
Schedule Of Income Taxes [Line Items]
Operating loss carryforwards	$ 43,000,000
State tax [Member] | Minimum [Member]
Schedule Of Income Taxes [Line Items]
Operating loss carryforwards for federal tax purposes	2016
State tax [Member] | Maximum [Member]
Schedule Of Income Taxes [Line Items]
Operating loss carryforwards for federal tax purposes	2035
Prepaid Expenses and Other Current Assets [Member]
Schedule Of Income Taxes [Line Items]
Deferred tax asset	$ 66,000	$ 124,000