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Income Taxes (Detail) - Reconciliation of “expected” income tax expense (benefit) to “actual” income tax expense (benefit) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]    
Computed “expected” tax expense (in Dollars) $ (269) $ 1,158
Computed “expected” tax expense (benefit) 24.30% 34.00%
Increases (reductions) in taxes resulting from:    
State income taxes, net of federal tax benefit (in Dollars) $ (107) $ 80
State income taxes, net of federal tax benefit 9.70% 2.40%
Foreign operations (in Dollars) $ (70) $ 18
Foreign operations 6.30% 0.50%
Permanent differences (in Dollars) $ (14) $ (4)
Permanent differences 1.30% (0.10%)
Change in valuation allowance (in Dollars) $ 118 $ (37)
Change in valuation allowance (10.70%) (1.10%)
Deemed repatriation tax $ 771 $ 0
Impace of 965 one-time transition tax (as a percent) (69.70%) 0.00%
Federal tax rate change $ 588 $ 0
Federal tax rate change (as a percent) (53.20%) 0.00%
Uncertain tax liability adjustment (in Dollars) $ 11 $ 8
Uncertain tax liability adjustment (1.00%) 0.20%
Research & Development Credit (in Dollars) $ (125) $ (53)
Research & Development Credit 11.30% (1.60%)
Other items (in Dollars) $ (21) $ (8)
Other items 2.00% (0.20%)
Income tax expense (benefit) $ 882 $ 1,162
Income tax expense (79.70%) 34.10%