Acquired Intangible Assets - Intangible assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Impaired Intangible Assets [Abstract]
Gross	$ 1,173	$ 1,173
Accumulated Amortization	1,136	1,125
Net	$ 37	$ 48
Customer list
Impaired Intangible Assets [Abstract]
Weighted Average Remaining Amortization Period	5 years	6 years
Gross	$ 910	$ 910
Accumulated Amortization	873	864
Net	$ 37	$ 46
Non-compete agreements
Impaired Intangible Assets [Abstract]
Weighted Average Remaining Amortization Period	0 years	0 years
Gross	$ 93	$ 93
Accumulated Amortization	93	93
Net	$ 0	$ 0
Developed technology
Impaired Intangible Assets [Abstract]
Weighted Average Remaining Amortization Period	0 years	0 years
Gross	$ 30	$ 30
Accumulated Amortization	30	30
Net	$ 0	$ 0
Trade name
Impaired Intangible Assets [Abstract]
Weighted Average Remaining Amortization Period	0 years	0 years
Gross	$ 140	$ 140
Accumulated Amortization	140	138
Net	$ 0	$ 2