Property and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ (2,996)	$ (1,944)
Property and equipment, net	5,339	5,026
Depreciation expense	1,825	1,195	$ 802
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment	2,382	1,990
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment	1,867	1,639
Terminals
Property, Plant and Equipment [Line Items]
Property and equipment	584	429
Office equipment
Property, Plant and Equipment [Line Items]
Property and equipment	942	940
Automobiles
Property, Plant and Equipment [Line Items]
Property and equipment	$ 366	307
Estimated Useful Life	3 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	$ 2,194	1,665
Computer Software
Property, Plant and Equipment [Line Items]
Property and equipment	$ 694	$ 674
Minimum | Computer equipment and software
Property, Plant and Equipment [Line Items]
Estimated Useful Life	2 years
Minimum | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated Useful Life	2 years
Minimum | Terminals
Property, Plant and Equipment [Line Items]
Estimated Useful Life	2 years
Minimum | Office equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Life	2 years
Minimum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated Useful Life	2 years
Maximum | Computer equipment and software
Property, Plant and Equipment [Line Items]
Estimated Useful Life	7 years
Maximum | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated Useful Life	7 years
Maximum | Terminals
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Maximum | Office equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated Useful Life	7 years