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Income Taxes - Summary of Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Income Tax Disclosure [Abstract] |  |  |
Unrecognized tax benefits at the beginning of the year |  | $ 254,000 | $ 244,000
Increases in tax positions for prior years |  | 10,000 | 10,000
Decreases in tax positions for prior years | $ (264,000) | (264,000) |
Unrecognized tax benefits at the end of the year | $ 0 | $ 0 | $ 254,000

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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