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Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Income Taxes [Line Items]
Net change in total valuation allowance	$ (1,900,000)	$ (900,000)
Operating loss carryforwards, expiration start year	2018
Net operating loss carryforwards will begin to expire	2017
Investment credit carryforwards	$ 44,000	44,000
Alternative minimum tax credit carryforwards	279,000	$ 149,000
Accrued interest or penalties	0
Federal [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	37,400,000
Investment credit carryforwards	$ 29,000
Research and development credits expiry period beginning year	2023
State [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 31,700,000
Research and development credit [Member] | Stock Option [Member] | Federal and state [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	18,800,000
Research and development credit [Member] | California [Member]
Income Taxes [Line Items]
Research and development credit carryforwards	$ 14,000

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