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Net Classification of Deferred Income Tax Assets and Liabilities in Balance Sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015
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Income Tax Disclosure [Abstract] |  |  |  |  |  |
Deferred income tax assets, net | $ 259 | $ 267 | $ 247 | $ 179 | $ 216 | $ 4,554
Deferred income tax liabilities, net | (37) |  |  |  | (37) | (44)
Net deferred income tax assets | $ 222 |  |  |  | $ 179 | $ 4,510

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