Summary of Significant Accounting Policies - Disaggregated revenues below by products/services and geography (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Revenue from External Customer [Line Items]
Total sales	$ 54,361	$ 49,208
Product
Revenue from External Customer [Line Items]
Sales	36,687	35,206
Total sales	36,688	35,226
Service
Revenue from External Customer [Line Items]
Sales	17,673	13,982
Total sales	17,673	13,982
Finance
Revenue from External Customer [Line Items]
Finance	1	20
HPP
Revenue from External Customer [Line Items]
Total sales	3,843	4,623
HPP | Product
Revenue from External Customer [Line Items]
Sales	2,516	3,126
Total sales	2,516	3,126
HPP | Service
Revenue from External Customer [Line Items]
Sales	1,327	1,497
Total sales	1,327	1,497
TS
Revenue from External Customer [Line Items]
Total sales	50,518	44,585
TS | Product
Revenue from External Customer [Line Items]
Sales	34,171	32,080
Total sales	34,172	32,100
TS | Service
Revenue from External Customer [Line Items]
Sales	16,346	12,485
Total sales	16,346	12,485
TS | Finance
Revenue from External Customer [Line Items]
Finance	1	20
TS | U.K..
Revenue from External Customer [Line Items]
Total sales	843	2,004
TS | U.K.. | Product
Revenue from External Customer [Line Items]
Sales	518	1,578
Total sales	518	1,578
TS | U.K.. | Service
Revenue from External Customer [Line Items]
Sales	325	426
Total sales	325	426
TS | UNITED STATES
Revenue from External Customer [Line Items]
Total sales	49,675	42,581
TS | UNITED STATES | Product
Revenue from External Customer [Line Items]
Sales	33,653	30,502
Total sales	33,654	30,522
TS | UNITED STATES | Service
Revenue from External Customer [Line Items]
Sales	16,021	12,059
Total sales	16,021	12,059
TS | UNITED STATES | Finance
Revenue from External Customer [Line Items]
Finance	$ 1	$ 20