Income and Other Taxes (Income Tax (Benefit) Expense) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Current federal tax expense (benefit)									$ 0	$ (502)	$ 135
Deferred federal income tax expense (benefit)									0	0	0
Total federal income tax (benefit) expense									0	(502)	135
Current state tax expense (benefit)									54	53	28
Deferred state tax expense (benefit)									0	0	0
Total state income tax (benefit) expense									54	53	28
Current foreign tax expense (benefit)									0	0	0
Deferred foreign income tax expense (benefit)									0	0	0
Total foreign income tax (benefit) expense									0	0	0
Total income tax (benefit) expense	$ 10	$ 14	$ 15	$ 15	$ 53	$ 0	$ (169)	$ (333)	$ 54	$ (449)	$ 163