Segment Information - Sales By Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	$ 79,061	$ 72,916
% of total	100.00%	100.00%
Americas
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	$ 72,522	$ 60,458
% of total	92.00%	83.00%
Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	$ 4,056	$ 10,325
% of total	5.00%	14.00%
Asia
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	$ 2,483	$ 2,133
% of total	3.00%	3.00%
High Performance Products Segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	$ 7,902	$ 10,479
% of total	10.00%	14.00%
High Performance Products Segment | Americas
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	$ 5,294	$ 8,424
High Performance Products Segment | Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	771	1,266
High Performance Products Segment | Asia
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	1,837	789
TS
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	$ 71,159	$ 62,437
% of total	90.00%	86.00%
TS | Americas
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	$ 67,228	$ 52,034
TS | Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	3,285	9,059
TS | Asia
Segment Reporting, Revenue Reconciling Item [Line Items]
Customer Revenues	$ 646	$ 1,344