Stockholders' Equity - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Options
Beginning balance (in shares)	612,000	1,206,000	1,221,500
Forfeited or expired (in shares)	(7,800)	(594,000)	(15,500)
Ending balance (in shares)	604,200	612,000	1,206,000	1,221,500
Vested and exercisable balance (in shares)	604,200
Weighted Average Exercise Price Per Share
Beginning balance (in dollars per share)	$ 6.23	$ 6.54	$ 6.51
Forfeited or expired (in dollars per share)	5.54	6.85	4.42
Ending balance (in dollars per share)	6.19	6.23	6.54	$ 6.51
Vested and exercisable balance (in dollars per share)	6.19
Weighted Average Grant-Date Fair Value Per Share
Beginning balance (in dollars per share)	1.59	1.21	1.22
Forfeited or expired (in dollars per share)	2.69	0.83	1.99
Ending balance (in dollars per share)	1.58	$ 1.59	$ 1.21	$ 1.22
Vested and exercisable balance (in dollars per share)	$ 1.58
Weighted Average Remaining Contractual Term
Balance	2 years 3 months 13 days	3 years 3 months 7 days	2 years 3 months 15 days	3 years 3 months 22 days
Vested and exercisable balance	2 years 3 months 13 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value	$ 0