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Segment Information - Sales By Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	$ 49,208	$ 61,793
% of total	100.00%	100.00%
Americas
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	$ 45,321	$ 59,178
% of total	92.00%	95.00%
Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	$ 3,203	$ 2,282
% of total	7.00%	4.00%
Asia
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	$ 684	$ 333
% of total	1.00%	1.00%
TS
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	$ 44,585	$ 55,917
% of total	91.00%	90.00%
TS | Americas
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	$ 41,783	$ 54,177
TS | Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	2,538	1,645
TS | Asia
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	264	95
High Performance Products Segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	$ 4,623	$ 5,876
% of total	9.00%	10.00%
High Performance Products Segment | Americas
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	$ 3,538	$ 5,001
High Performance Products Segment | Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	665	637
High Performance Products Segment | Asia
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	$ 420	$ 238

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