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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
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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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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Alternative Minimum Tax -URI http://asc.fasb.org/extlink&oid=6504908 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 + Details
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