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
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