Income Taxes (Detail) - A reconciliation of the beginning and ending balances of the total amounts of gross unrecognized tax benefits - USD ($) $ in Thousands |
12 Months Ended | |
---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
|
Income Tax Disclosure [Abstract] | ||
Balance, beginning of year | $ 209 | $ 202 |
Accrued penalties and interest | 11 | 7 |
Balance, end of period | $ 220 | $ 209 |