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Income Taxes - Income Taxes Computed Using Federal Income Tax Rate (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Sep. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |
Amount computed using statutory rate |  |  |  |  |  |  | $ (666) | $ (674) | $ 1,798
Net change in valuation allowance for net deferred tax assets |  |  |  |  |  |  | 1,889 | 1,619 | (1,677)
AMT and other |  |  |  |  |  |  | (148) | 151 |
Foreign rate differential |  |  |  |  |  |  | (70) | (1) |
Non-deductible items |  |  |  |  |  |  | (1,136) | (182) | (411)
State income tax |  |  |  |  |  |  | (15) | (370) | 288
Foreign net operating loss |  |  |  |  |  |  | 147 |  |
Income tax (provision) benefit | $ 96 | $ (79) | $ (16) | $ (32) | $ 578 | $ (3) | $ 1 | $ 543 | $ (2)

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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