Income Taxes - Schedule of Components of Income (Loss) Before Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Domestic	$ 916	$ 7,845	$ 1,900
Foreign	(4,648)	(2,320)	7,930
Income (loss) before provision for income taxes	$ (3,732)	$ 5,525	$ 9,830