Stockholders' Equity - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Options
Beginning balance (in shares)	1,206,000	1,221,500	1,370,000
Forfeited or expired (in shares)	(594,000)	(15,500)	(148,500)
Ending balance (in shares)	612,000	1,206,000	1,221,500	1,370,000
Vested and exercisable balance (in shares)	612,000
Weighted Average Exercise Price Per Share
Beginning balance (in dollars per share)	$ 6.54	$ 6.51	$ 6.34
Forfeited or expired (in dollars per share)	6.85	4.42	4.93
Ending balance (in dollars per share)	6.23	6.54	6.51	$ 6.34
Vested and exercisable balance (in dollars per share)	6.23
Weighted Average Grant-Date Fair Value Per Share
Beginning balance (in dollars per share)	1.21	1.22	1.80
Forfeited or expired (in dollars per share)	0.83	1.99	6.48
Ending balance (in dollars per share)	1.59	$ 1.21	$ 1.22	$ 1.80
Vested and exercisable balance (in dollars per share)	$ 1.59
Weighted Average Remaining Contractual Term
Balance	3 years 3 months 7 days	2 years 3 months 15 days	3 years 3 months 22 days	4 years 1 month 13 days
Vested and exercisable balance	3 years 3 months 7 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value	$ 0