Income and Other Taxes (Continuing Operations before Income Taxes) (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]
Domestic									$ (35,100)	$ (16,752)	$ 10,632
Foreign									(830)	(1,150)	(2,248)
Loss before income tax (expense) benefit	$ (14,965)	$ (10,463)	$ (4,979)	$ (5,523)	$ (5,833)	$ (8,414)	$ (3,240)	$ (415)	$ (35,930)	$ (17,902)	$ 8,384