Supporting Financial Information - Equipment and Improvements, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018
Property, Plant and Equipment [Line Items]
Furniture and equipment	$ 326		$ 326
Computer equipment	751		751
Computer software	1,731		1,731
Leasehold improvements	66		66
Total fixed assets	2,874		2,874
Less accumulated depreciation and amortization	(1,430)		(1,308)
Equipment and improvements, net	$ 1,444		$ 1,566
Minimum
Property, Plant and Equipment [Line Items]
Estimated useful of long-lived assets	3 years
Maximum
Property, Plant and Equipment [Line Items]
Estimated useful of long-lived assets	7 years
Leasehold Improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful of long-lived assets	3 years
Leasehold Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful of long-lived assets	7 years
Equipment
Property, Plant and Equipment [Line Items]
Depreciation of equipment	$ 100	$ 100