Income Taxes - Schedule of Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Current:
Domestic federal		$ 1,167	$ 54
Foreign	$ 1,278	(1,404)	1,330
Foreign withholding taxes	94	356	240
Domestic state	58	101	120
Total current	1,430	220	1,744
Deferred:
Domestic federal		0	0
Total deferred	0	0	0
Total provision	$ 1,430	$ 220	$ 1,744